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Yuh Shiohara - One of the best experts on this subject based on the ideXlab platform.
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construction of the quasi ternary phase diagram in the ndo1 5 bao cuox system in an air atmosphere part i equilibrium tie lines in the nd1 xba2 xcu3o6 δ solid solution and liquid region
Journal of the American Ceramic Society, 2005Co-Authors: M Kambara, Takateru Umeda, Minoru Tagami, Xin Yao, Eugene A Goodilin, Yuh ShioharaAbstract:Quasi-ternary phase diagrams of the NdO1.5-BaO-CuOx system near the CuOx corner have been constructed near the Peritectic Temperature in air of the Nd1+xBa2−xCu3O6+delta (Nd123) solid-solution phase. Liquidus curves were determined by measuring the Temperature dependences of the neodymium, barium, and copper solubilities in Nd-Ba-Cu-O solutions with different BaO:CuO ratios. Solidus line compositions and equilibrium tie lines were determined by analyzing the compositions of the Nd123 solid solution equilibrated with the melt by quenching samples held isothermally. Based on the tie-line features in the Nd123-and- liquid two-phase field, the Nd123 solid solution with the smaller substitution content was observed to be equilibrated with the solution melt with a higher BaO:CuO ratio, even in an air atmosphere. Nd123 crystal with a substitution content of ∼0.02 could be formed from the solution with the BaO:CuO ratio of greaterthan equal to0.75, which resulted in higher critical superconducting transition Temperatures.
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equilibrium tie line in pro y bao cuo ternary phase diagram around Peritectic Temperature of pr 1 x ba 2 x cu 3 o 7 δ
Journal of Materials Research, 1998Co-Authors: Minoru Tagami, Takateru Umeda, Makoto Kambara, Yuh ShioharaAbstract:This paper presents tie-lines between Pr1+xBa2−xCu3O7−δ and liquid on a PrOy –BaO–CuO ternary phase diagram at 965, 970, 975, 980, and 990 °C in air atmosphere, for which knowledge is necessary to fabricate composition controlled Pr1+xBa2−xCu3O7−δ single crystals by the solution growth method. Liquidus faces have been investigated by dipping MgO single crystal rods into the thermal equilibrium melt at various Temperatures and analyzing the composition of the adhering melt by ICP. The compositions of Pr1+xBa2−xCu3O7−δ solid solution coexisting with various compositions of liquids were obtained by quantitative EPMA analysis of quenched melts. Tie-lines were calculated by applying the lever rule to these experimental data for solid compositions and liquidus faces. Furthermore, the relationships between solid solubilities and Peritectic Temperatures of Pr1+xBa2−xCu3O7−δ are reported.
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effect of oxygen partial pressure on the neodymium solubility in bacuo solvent
Physica C-superconductivity and Its Applications, 1996Co-Authors: Masaru Nakamura, Takateru Umeda, Makoto Kambara, Yuh ShioharaAbstract:Abstract The neodymium (Nd) solubility in BaCuO solvent with a Ba to Cu ratio of 3 to 5 was investigated under different oxygen partial pressures (P(O2) = 1, 21, 100%). A small amount of the solution was taken out by dipping thermally equilibrated MgO single crystals, and compositions of these specimens stuck with liquid on the MgO, were analyzed by inductively coupled plasma spectrometry (ICP). Sampling the solution for ICP analysis was performed in the Temperature range from approximately 1000°C up to 1200°C. The Peritectic Temperature of NdBa2Cu3O7−δ (Nd123) increased with increasing oxygen partial pressure. The Nd solubility at the Peritectic temmperature of Nd123 increased with increasing oxygen partial pressure. The slope of the Nd 123 liquidus lines near the Peritectic Temperature decreased with increasing oxygen partial pressure. Assuming a regular solution, expressions for the solubility and the enthalpy of dissolution of Nd123 and Nd4Ba2Cu2O10 (Nd422) were derived from classical thermodynamic calculations. The enthalpies of dissolution ΔHdiss for Nd123 and Nd422 decreased with increasing oxygen partial pressure.
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oxygen partial pressure dependence of the yttrium solubility in y ba cu o solution
Journal of Materials Research, 1996Co-Authors: Masaru Nakamura, Christian Krauns, Yuh ShioharaAbstract:The yttrium solubility in Ba{endash}Cu{endash}O solvent with a Ba to Cu ratio of 3 to 5 was investigated under different oxygen partial pressure [P(O{sub 2})=2, 21, 100{percent}]. A small amount of the solution was taken out by dipping thermally equilibrated MgO single crystals, and compositions of these specimens were analyzed by inductively coupled plasma atomic emission spectrometry (ICP-AES). The measurements were performed for the samples prepared in the Temperature range from approximately 950{degree}C up to 1100{degree}C. The Peritectic Temperature of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} (Y123) decreased with decreasing oxygen partial pressure. On the other hand, the Y123 liquidus lines do not show remarkable oxygen partial pressure dependency. Accordingly, the yttrium solubility at the Peritectic Temperature of Y123 under {ital P}(O{sub 2})=100{percent} was larger than those for the other conditions [{ital P}(O{sub 2})=2{percent} and 21{percent}]. Assuming a regular solution, expressions for the solubility and the enthalpy of dissolution of Y123 and Y{sub 2}BaCuO{sub 5} (Y211) were derived from classical thermodynamic calculations and found to be 289 kJ/mol at {ital P}(O{sub 2})=0.02, 239 kJ/mol at {ital P}(O{sub 2})=0.21 atm, 206 kJ/mol at {ital P}(O{sub 2})=1 atm for Y123 and 105 kJ/mol at {ital P}(O{sub 2})=0.02 atm, 88.0 kJ/mol at {ital P}(O{submore » 2})=0.21 atm, and 88.4 kJ/mol at {ital P}(O{sub 2})=1 atm for Y211. Furthermore, the Jackson {alpha} factor of Y123 was estimated to be about 20, confirming a faceted growth nature of this crystal. {copyright} {ital 1996 Materials Research Society.}« less
Takateru Umeda - One of the best experts on this subject based on the ideXlab platform.
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construction of the quasi ternary phase diagram in the ndo1 5 bao cuox system in an air atmosphere part i equilibrium tie lines in the nd1 xba2 xcu3o6 δ solid solution and liquid region
Journal of the American Ceramic Society, 2005Co-Authors: M Kambara, Takateru Umeda, Minoru Tagami, Xin Yao, Eugene A Goodilin, Yuh ShioharaAbstract:Quasi-ternary phase diagrams of the NdO1.5-BaO-CuOx system near the CuOx corner have been constructed near the Peritectic Temperature in air of the Nd1+xBa2−xCu3O6+delta (Nd123) solid-solution phase. Liquidus curves were determined by measuring the Temperature dependences of the neodymium, barium, and copper solubilities in Nd-Ba-Cu-O solutions with different BaO:CuO ratios. Solidus line compositions and equilibrium tie lines were determined by analyzing the compositions of the Nd123 solid solution equilibrated with the melt by quenching samples held isothermally. Based on the tie-line features in the Nd123-and- liquid two-phase field, the Nd123 solid solution with the smaller substitution content was observed to be equilibrated with the solution melt with a higher BaO:CuO ratio, even in an air atmosphere. Nd123 crystal with a substitution content of ∼0.02 could be formed from the solution with the BaO:CuO ratio of greaterthan equal to0.75, which resulted in higher critical superconducting transition Temperatures.
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equilibrium tie line in pro y bao cuo ternary phase diagram around Peritectic Temperature of pr 1 x ba 2 x cu 3 o 7 δ
Journal of Materials Research, 1998Co-Authors: Minoru Tagami, Takateru Umeda, Makoto Kambara, Yuh ShioharaAbstract:This paper presents tie-lines between Pr1+xBa2−xCu3O7−δ and liquid on a PrOy –BaO–CuO ternary phase diagram at 965, 970, 975, 980, and 990 °C in air atmosphere, for which knowledge is necessary to fabricate composition controlled Pr1+xBa2−xCu3O7−δ single crystals by the solution growth method. Liquidus faces have been investigated by dipping MgO single crystal rods into the thermal equilibrium melt at various Temperatures and analyzing the composition of the adhering melt by ICP. The compositions of Pr1+xBa2−xCu3O7−δ solid solution coexisting with various compositions of liquids were obtained by quantitative EPMA analysis of quenched melts. Tie-lines were calculated by applying the lever rule to these experimental data for solid compositions and liquidus faces. Furthermore, the relationships between solid solubilities and Peritectic Temperatures of Pr1+xBa2−xCu3O7−δ are reported.
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quasi binary phase diagram of nd4ba2cu2o10ba3cu5o8 system
Physica C-superconductivity and Its Applications, 1997Co-Authors: M Kambara, Y Shiohara, Masaru Nakamura, Takateru UmedaAbstract:Abstract Nd 1 Ba 2 Cu 3 O 7− y (Nd123) melt processed in a reduced oxygen atmosphere exhibits good superconducting characteristics including high T c and high J c . Hence, its single crystal is required for evaluation of fundamental superconducting properties as well as for future devices of high Temperature superconductive oxides. Information of the phase diagram especially in the range of obtaining Nd123 single crystals from solution is indispensable to fabricate Nd123 single crystals by the Top-Seeded Solution Growth (TSSG), which has not been fully investigated yet. In this work, the Temperature dependence of Nd solubility in the BaCuO solution with a Ba to Cu ratio of 3 to 5 was investigated by analyzing the composition of the solution stuck to the thermally equilibrated MgO single crystal which was dipped into the equilibrated solution at different Temperatures. Transformation Temperatures including the Peritectic Temperature and stable phases were measured by X-ray diffraction (XRD) by quenching samples held isothermally around the transformation Temperature estimated in advance by differential thermal analysis (TG-DTA). From these experiments the phase diagram of quasi-binary system between Nd 4 Ba 2 Cu 2 O 10 and 3BaCuO 2 + 2CuO(Ba 3 Cu 5 O 8 ) has been constructed.
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effect of oxygen partial pressure on the neodymium solubility in bacuo solvent
Physica C-superconductivity and Its Applications, 1996Co-Authors: Masaru Nakamura, Takateru Umeda, Makoto Kambara, Yuh ShioharaAbstract:Abstract The neodymium (Nd) solubility in BaCuO solvent with a Ba to Cu ratio of 3 to 5 was investigated under different oxygen partial pressures (P(O2) = 1, 21, 100%). A small amount of the solution was taken out by dipping thermally equilibrated MgO single crystals, and compositions of these specimens stuck with liquid on the MgO, were analyzed by inductively coupled plasma spectrometry (ICP). Sampling the solution for ICP analysis was performed in the Temperature range from approximately 1000°C up to 1200°C. The Peritectic Temperature of NdBa2Cu3O7−δ (Nd123) increased with increasing oxygen partial pressure. The Nd solubility at the Peritectic temmperature of Nd123 increased with increasing oxygen partial pressure. The slope of the Nd 123 liquidus lines near the Peritectic Temperature decreased with increasing oxygen partial pressure. Assuming a regular solution, expressions for the solubility and the enthalpy of dissolution of Nd123 and Nd4Ba2Cu2O10 (Nd422) were derived from classical thermodynamic calculations. The enthalpies of dissolution ΔHdiss for Nd123 and Nd422 decreased with increasing oxygen partial pressure.
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high Temperature phase relationship in the prbao3 bacu3o4 quasi binary system
Physica C-superconductivity and Its Applications, 1995Co-Authors: M Sumida, Y Shiohara, Minoru Tagami, Ch Krauns, Takateru UmedaAbstract:Abstract Further development of the process to synthesize Pr 1 Ba 2 Cu 3 O 7−δ (Pr123) single crystals is desirable for future applications of high Temperature superconductive oxides. However, the phase diagram of the Pr123 oxide, in particular in the Temperature range of melting and decomposition, has not been fully investigated. In this work, the Peritectic Temperature of Pr123 was measured by differential thermal analysis (DTA) and by X-ray diffraction (XRD) after appropriate quenching experiments. The stable phases were identified by XRD for the same quenching experiments. Furthermore, the solubility of Pr in the BaCu 3 O 4 melt was measured. As a result, the PrBaO 3 (Pr110) phase was confirmed to be th higher Temperature stable phase. Expressions for the liquidus lines, the enthalpy of dissolution of Pr and the slopes of the liquidus lines at the Peritectic Temperature of Pr123 were obtained for the different stable phases (Pr110 and Pr123).
Y Shiohara - One of the best experts on this subject based on the ideXlab platform.
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mechanism of liquid phase epitaxy growth of ndba2cu3o7 xfilm from low Peritectic Temperature yba2cu3o7 xseed film
Journal of Materials Research, 2002Co-Authors: D X Huang, Xin Yao, Katsumi Nomura, T Izumi, Yuichi Nakamura, Y ShioharaAbstract:NdBa2Cu3O7-x (NdBCO) superconducting films were successfully grown on MgO substrates by liquid-phase epitaxy (LPE) using YBa2Cu3O7-x (YBCO) seed films which have lower Peritectic Temperatures. Microstructural characterizations using optical and electron microscopes revealed that most of the seed grains decomposed at the high processing Temperature and dissolved when they touched the solution. The NdBCO grains were formed first by the quasi-homoepitaxial growth of NdBCO units on the few surviving YBCO seed grains and then grew pendently to cover the large bare surface areas of the MgO substrates quickly by lateral overgrowth. A micrometer-thick melt layer was entrapped between the film and the substrate. Through the few links provided by the surviving seed grains, a stable film/substrate orientation relationship could still be maintained. A semiquantitative analysis was done for the lateral overgrowth process, and two different lateral overgrowth stages were observed with about 50 times difference in the lateral overgrowth rate. Then, a semiquantitative understanding for the entire YBCO-seeded NdBCO LPE growth process was finally reached.
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growth mechanism of high Peritectic Temperature nd1 xba2 xcu3o7 δ thick film on low Peritectic Temperature yba2cu3o7 δ seed film by liquid phase epitaxy
Journal of Crystal Growth, 2002Co-Authors: Xin Yao, Katsumi Nomura, Yusuke Nakamura, T Izumi, Y ShioharaAbstract:Abstract YBa 2 Cu 3 O 7− δ (YBCO) thin films were used as seed films for growing high Peritectic Temperature ( T P ) Nd 1+ x Ba 2− x Cu 3 O 7− δ (NdBCO) thick films by liquid phase epitaxy. On heating to a Temperature above T P , polycrystalline YBCO grains agglomerate and then partially decompose. The metastable YBCO phase takes the lowest energy configuration, an enlarged size and a shape with an equilibrium curvature, which prohibits them from immediate decomposition and dissolution. As a result, the retained YBCO grains act as heteroeptaxial-seeds for the growing NdBCO grains in the Nd–Ba–Cu–O solution. Yttrium was detected in the NdBCO grains grown in the initial stage by EPMA, strongly supporting a model of the YBCO-seeded NdBCO growth.
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quasi binary phase diagram of nd4ba2cu2o10ba3cu5o8 system
Physica C-superconductivity and Its Applications, 1997Co-Authors: M Kambara, Y Shiohara, Masaru Nakamura, Takateru UmedaAbstract:Abstract Nd 1 Ba 2 Cu 3 O 7− y (Nd123) melt processed in a reduced oxygen atmosphere exhibits good superconducting characteristics including high T c and high J c . Hence, its single crystal is required for evaluation of fundamental superconducting properties as well as for future devices of high Temperature superconductive oxides. Information of the phase diagram especially in the range of obtaining Nd123 single crystals from solution is indispensable to fabricate Nd123 single crystals by the Top-Seeded Solution Growth (TSSG), which has not been fully investigated yet. In this work, the Temperature dependence of Nd solubility in the BaCuO solution with a Ba to Cu ratio of 3 to 5 was investigated by analyzing the composition of the solution stuck to the thermally equilibrated MgO single crystal which was dipped into the equilibrated solution at different Temperatures. Transformation Temperatures including the Peritectic Temperature and stable phases were measured by X-ray diffraction (XRD) by quenching samples held isothermally around the transformation Temperature estimated in advance by differential thermal analysis (TG-DTA). From these experiments the phase diagram of quasi-binary system between Nd 4 Ba 2 Cu 2 O 10 and 3BaCuO 2 + 2CuO(Ba 3 Cu 5 O 8 ) has been constructed.
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high Temperature phase relationship in the prbao3 bacu3o4 quasi binary system
Physica C-superconductivity and Its Applications, 1995Co-Authors: M Sumida, Y Shiohara, Minoru Tagami, Ch Krauns, Takateru UmedaAbstract:Abstract Further development of the process to synthesize Pr 1 Ba 2 Cu 3 O 7−δ (Pr123) single crystals is desirable for future applications of high Temperature superconductive oxides. However, the phase diagram of the Pr123 oxide, in particular in the Temperature range of melting and decomposition, has not been fully investigated. In this work, the Peritectic Temperature of Pr123 was measured by differential thermal analysis (DTA) and by X-ray diffraction (XRD) after appropriate quenching experiments. The stable phases were identified by XRD for the same quenching experiments. Furthermore, the solubility of Pr in the BaCu 3 O 4 melt was measured. As a result, the PrBaO 3 (Pr110) phase was confirmed to be th higher Temperature stable phase. Expressions for the liquidus lines, the enthalpy of dissolution of Pr and the slopes of the liquidus lines at the Peritectic Temperature of Pr123 were obtained for the different stable phases (Pr110 and Pr123).
Minoru Tagami - One of the best experts on this subject based on the ideXlab platform.
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construction of the quasi ternary phase diagram in the ndo1 5 bao cuox system in an air atmosphere part i equilibrium tie lines in the nd1 xba2 xcu3o6 δ solid solution and liquid region
Journal of the American Ceramic Society, 2005Co-Authors: M Kambara, Takateru Umeda, Minoru Tagami, Xin Yao, Eugene A Goodilin, Yuh ShioharaAbstract:Quasi-ternary phase diagrams of the NdO1.5-BaO-CuOx system near the CuOx corner have been constructed near the Peritectic Temperature in air of the Nd1+xBa2−xCu3O6+delta (Nd123) solid-solution phase. Liquidus curves were determined by measuring the Temperature dependences of the neodymium, barium, and copper solubilities in Nd-Ba-Cu-O solutions with different BaO:CuO ratios. Solidus line compositions and equilibrium tie lines were determined by analyzing the compositions of the Nd123 solid solution equilibrated with the melt by quenching samples held isothermally. Based on the tie-line features in the Nd123-and- liquid two-phase field, the Nd123 solid solution with the smaller substitution content was observed to be equilibrated with the solution melt with a higher BaO:CuO ratio, even in an air atmosphere. Nd123 crystal with a substitution content of ∼0.02 could be formed from the solution with the BaO:CuO ratio of greaterthan equal to0.75, which resulted in higher critical superconducting transition Temperatures.
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equilibrium tie line in pro y bao cuo ternary phase diagram around Peritectic Temperature of pr 1 x ba 2 x cu 3 o 7 δ
Journal of Materials Research, 1998Co-Authors: Minoru Tagami, Takateru Umeda, Makoto Kambara, Yuh ShioharaAbstract:This paper presents tie-lines between Pr1+xBa2−xCu3O7−δ and liquid on a PrOy –BaO–CuO ternary phase diagram at 965, 970, 975, 980, and 990 °C in air atmosphere, for which knowledge is necessary to fabricate composition controlled Pr1+xBa2−xCu3O7−δ single crystals by the solution growth method. Liquidus faces have been investigated by dipping MgO single crystal rods into the thermal equilibrium melt at various Temperatures and analyzing the composition of the adhering melt by ICP. The compositions of Pr1+xBa2−xCu3O7−δ solid solution coexisting with various compositions of liquids were obtained by quantitative EPMA analysis of quenched melts. Tie-lines were calculated by applying the lever rule to these experimental data for solid compositions and liquidus faces. Furthermore, the relationships between solid solubilities and Peritectic Temperatures of Pr1+xBa2−xCu3O7−δ are reported.
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high Temperature phase relationship in the prbao3 bacu3o4 quasi binary system
Physica C-superconductivity and Its Applications, 1995Co-Authors: M Sumida, Y Shiohara, Minoru Tagami, Ch Krauns, Takateru UmedaAbstract:Abstract Further development of the process to synthesize Pr 1 Ba 2 Cu 3 O 7−δ (Pr123) single crystals is desirable for future applications of high Temperature superconductive oxides. However, the phase diagram of the Pr123 oxide, in particular in the Temperature range of melting and decomposition, has not been fully investigated. In this work, the Peritectic Temperature of Pr123 was measured by differential thermal analysis (DTA) and by X-ray diffraction (XRD) after appropriate quenching experiments. The stable phases were identified by XRD for the same quenching experiments. Furthermore, the solubility of Pr in the BaCu 3 O 4 melt was measured. As a result, the PrBaO 3 (Pr110) phase was confirmed to be th higher Temperature stable phase. Expressions for the liquidus lines, the enthalpy of dissolution of Pr and the slopes of the liquidus lines at the Peritectic Temperature of Pr123 were obtained for the different stable phases (Pr110 and Pr123).
Xin Yao - One of the best experts on this subject based on the ideXlab platform.
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construction of the quasi ternary phase diagram in the ndo1 5 bao cuox system in an air atmosphere part i equilibrium tie lines in the nd1 xba2 xcu3o6 δ solid solution and liquid region
Journal of the American Ceramic Society, 2005Co-Authors: M Kambara, Takateru Umeda, Minoru Tagami, Xin Yao, Eugene A Goodilin, Yuh ShioharaAbstract:Quasi-ternary phase diagrams of the NdO1.5-BaO-CuOx system near the CuOx corner have been constructed near the Peritectic Temperature in air of the Nd1+xBa2−xCu3O6+delta (Nd123) solid-solution phase. Liquidus curves were determined by measuring the Temperature dependences of the neodymium, barium, and copper solubilities in Nd-Ba-Cu-O solutions with different BaO:CuO ratios. Solidus line compositions and equilibrium tie lines were determined by analyzing the compositions of the Nd123 solid solution equilibrated with the melt by quenching samples held isothermally. Based on the tie-line features in the Nd123-and- liquid two-phase field, the Nd123 solid solution with the smaller substitution content was observed to be equilibrated with the solution melt with a higher BaO:CuO ratio, even in an air atmosphere. Nd123 crystal with a substitution content of ∼0.02 could be formed from the solution with the BaO:CuO ratio of greaterthan equal to0.75, which resulted in higher critical superconducting transition Temperatures.
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mechanism of liquid phase epitaxy growth of ndba2cu3o7 xfilm from low Peritectic Temperature yba2cu3o7 xseed film
Journal of Materials Research, 2002Co-Authors: D X Huang, Xin Yao, Katsumi Nomura, T Izumi, Yuichi Nakamura, Y ShioharaAbstract:NdBa2Cu3O7-x (NdBCO) superconducting films were successfully grown on MgO substrates by liquid-phase epitaxy (LPE) using YBa2Cu3O7-x (YBCO) seed films which have lower Peritectic Temperatures. Microstructural characterizations using optical and electron microscopes revealed that most of the seed grains decomposed at the high processing Temperature and dissolved when they touched the solution. The NdBCO grains were formed first by the quasi-homoepitaxial growth of NdBCO units on the few surviving YBCO seed grains and then grew pendently to cover the large bare surface areas of the MgO substrates quickly by lateral overgrowth. A micrometer-thick melt layer was entrapped between the film and the substrate. Through the few links provided by the surviving seed grains, a stable film/substrate orientation relationship could still be maintained. A semiquantitative analysis was done for the lateral overgrowth process, and two different lateral overgrowth stages were observed with about 50 times difference in the lateral overgrowth rate. Then, a semiquantitative understanding for the entire YBCO-seeded NdBCO LPE growth process was finally reached.
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growth mechanism of high Peritectic Temperature nd1 xba2 xcu3o7 δ thick film on low Peritectic Temperature yba2cu3o7 δ seed film by liquid phase epitaxy
Journal of Crystal Growth, 2002Co-Authors: Xin Yao, Katsumi Nomura, Yusuke Nakamura, T Izumi, Y ShioharaAbstract:Abstract YBa 2 Cu 3 O 7− δ (YBCO) thin films were used as seed films for growing high Peritectic Temperature ( T P ) Nd 1+ x Ba 2− x Cu 3 O 7− δ (NdBCO) thick films by liquid phase epitaxy. On heating to a Temperature above T P , polycrystalline YBCO grains agglomerate and then partially decompose. The metastable YBCO phase takes the lowest energy configuration, an enlarged size and a shape with an equilibrium curvature, which prohibits them from immediate decomposition and dissolution. As a result, the retained YBCO grains act as heteroeptaxial-seeds for the growing NdBCO grains in the Nd–Ba–Cu–O solution. Yttrium was detected in the NdBCO grains grown in the initial stage by EPMA, strongly supporting a model of the YBCO-seeded NdBCO growth.