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Toshio Kimura - One of the best experts on this subject based on the ideXlab platform.
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Effect of Filler Materials on Texture Development in Bi0.5(Na0.85K0.15)0.5TiO3 Ceramics
Ferroelectrics, 2013Co-Authors: Yuka Negishi, Toshio KimuraAbstract:Textured Bi0.5(Na0.85K0.15)TiO3 (BNKT) ceramics were prepared by reactive-templated grain growth method with platelike Bi4Ti3O12 grains as reactive templates. A mixture of raw materials or a pre-reacted BNKT powder was added as filler to control the amount of template grains. This work focused on the effect of filler material type on the chemical reaction and compositional homogeneity. The mixture of raw materials gave a faster reaction rate than did the pre-reacted BNKT powder. The slower reaction with the pre-reacted BNKT powder resulted in the formation of a liquid phase and a retarded Texture Development.
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Mechanism of Texture Development in Bi0.5(Na,K)0.5TiO3 Templated by Platelike Al2O3 Particles
Journal of the American Ceramic Society, 2008Co-Authors: Takeshi Shoji, Yusuke Yoshida, Toshio KimuraAbstract:It was found that platelike Al2O3 particles acted as a template for 〈100〉 Texture in Bi0.5(Na1−xKx)0.5TiO3 (BNKT) grains prepared by the templated grain growth process. The degree of orientation was dependent on the potassium concentration in BNKT. The origin of Texture Development was discussed by examining the effect of potassium concentration on Texture Development through microstructure observation. Texture developed in the BNKT grains adhering to the Al2O3 plate faces, and the origin of Texture Development was the formation of the phase boundaries with thestructure. The degree of orientation was determined by the grain size of BNKT grains, porosity, and the efficiency of Texture evolution. These factors were dependent on the potassium concentration, and the efficiency of Texture evolution was determined by the energy of the phase boundaries with thestructure.
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Effect of Template Particle Formation on Texture Development in Bi0.5Na0.5TiO3 Ceramics
Key Engineering Materials, 2008Co-Authors: Toshio Kimura, Takao MotohashiAbstract:The factor determining Texture Development was examined for Bi0.5Na0.5TiO3 ceramics made by the reactive-templated grain growth process using platelike Bi4Ti3O12 particles as reactive template. Platelike, skeleton Bi0.5Na0.5TiO3 particles were formed by the reaction between Bi4Ti3O12 and Na2CO3 in calcined compacts. Coalescence of small grains in the skeleton particles to form single template particles was important to obtain highly Textured ceramics.
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Origin of Texture Development in Barium Bismuth Titanate Prepared by the Templated Grain Growth Method
Journal of the American Ceramic Society, 2006Co-Authors: Toshio Kimura, Yusuke YoshidaAbstract:Microstructure Development was examined for BaBi4Ti4O15 prepared by the templated grain growth method, and the origin of Texture Development was discussed. The microstructure Development in a compact composed of a platelike template and equiaxed matrix grains was characterized as follows: (1) the template grains thickened at an early stage; (2) the matrix grains changed their shape from equiaxed to platelike, and simultaneously, the plate faces aligned parallel to those of template grains; and (3) a group of large grains with mutually parallel alignment was formed by prolonged heating at high temperature. Texture developed during these microstructural changes, and process (2) made the greatest contribution toward Texture Development.
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Effects of processing methods on Texture Development and densification in SrBi4Ti4O15 ceramics
Journal of Materials Science, 2005Co-Authors: Yoshiyuki Sakuma, Toshio KimuraAbstract:This paper deals with the effects of preparation methods on the Texture Development and densification in Textured SrBi 4 Ti 4 O 15 (SBT) ceramics. The specimens were prepared by the oriented consolidation of anisotropic particles (OCAP), templated grain growth (TGG) and reactive templated grain growth (RTGG) methods. The specimens with extensive Texture were obtained by all methods except for TGG with small template and large matrix particles. The origin of extensive Texture Development was the growth of aligned platelike particles. A characteristic of microstructure was the formation of colonies, in which platelike grains contacted face-to-face. The size of colonies was dependent on the preparation method, and determined the size of pores between colonies, which had a large effect on the sintered density. The OCAP and RTGG methods gave the green compacts composed of only platelike particles and large colonies and pores formed during sintering. The TGG method gave the green compacts composed of platelike and equiaxed particles and prevented the formation of large colonies and pores during sintering. Thus, the dense, highly-Textured SBT ceramics were obtained by the TGG method.
O Gutfleisch - One of the best experts on this subject based on the ideXlab platform.
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mechanism of the Texture Development in hydrogen disproportionation desorption recombination hddr processed nd fe b powders
Acta Materialia, 2015Co-Authors: H Sepehriamin, T Ohkubo, K Hono, Konrad Guth, O GutfleischAbstract:Abstract Microstructure evolution in Nd12.8Fe80.1B6.6Ga0.3Nb0.2 alloy powders at different hydrogen pressures during the hydrogen-disproportionation process P H2 HD has been studied in order to understand the underlying mechanism of the Texture Development during the dynamic hydrogen-disproportionation–desorption-recombination (d-HDDR) process. Transmission electron microscopy showed that Fe2B grains “memorize” the crystallographic orientation of the initial Nd2Fe14B phase and transfer it to the recombined Nd2Fe14B grains in the highly Textured sample. 3-D tomography of backscattered electron SEM images showed that recombined Nd2Fe14B grains nucleate at the interfaces of Fe2B/NdH2 phases, which grow through the interfaces of NdH2/α-Fe phases during the DR process. Boron segregation was found at the NdH2/α-Fe interfaces, which serve as a boron source for the growth of the recombined Nd2Fe14B grains. The mechanism of the Texture Development is discussed based on the microstructure observations and the corresponding evolution of magnetic properties.
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Mechanism of the Texture Development in hydrogen-disproportionation–desorption-recombination (HDDR) processed Nd–Fe–B powders
Acta Materialia, 2015Co-Authors: H. Sepehri-amin, T Ohkubo, K Hono, Konrad Guth, O GutfleischAbstract:Abstract Microstructure evolution in Nd12.8Fe80.1B6.6Ga0.3Nb0.2 alloy powders at different hydrogen pressures during the hydrogen-disproportionation process P H2 HD has been studied in order to understand the underlying mechanism of the Texture Development during the dynamic hydrogen-disproportionation–desorption-recombination (d-HDDR) process. Transmission electron microscopy showed that Fe2B grains “memorize” the crystallographic orientation of the initial Nd2Fe14B phase and transfer it to the recombined Nd2Fe14B grains in the highly Textured sample. 3-D tomography of backscattered electron SEM images showed that recombined Nd2Fe14B grains nucleate at the interfaces of Fe2B/NdH2 phases, which grow through the interfaces of NdH2/α-Fe phases during the DR process. Boron segregation was found at the NdH2/α-Fe interfaces, which serve as a boron source for the growth of the recombined Nd2Fe14B grains. The mechanism of the Texture Development is discussed based on the microstructure observations and the corresponding evolution of magnetic properties.
Yusuke Yoshida - One of the best experts on this subject based on the ideXlab platform.
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Mechanism of Texture Development in Bi0.5(Na,K)0.5TiO3 Templated by Platelike Al2O3 Particles
Journal of the American Ceramic Society, 2008Co-Authors: Takeshi Shoji, Yusuke Yoshida, Toshio KimuraAbstract:It was found that platelike Al2O3 particles acted as a template for 〈100〉 Texture in Bi0.5(Na1−xKx)0.5TiO3 (BNKT) grains prepared by the templated grain growth process. The degree of orientation was dependent on the potassium concentration in BNKT. The origin of Texture Development was discussed by examining the effect of potassium concentration on Texture Development through microstructure observation. Texture developed in the BNKT grains adhering to the Al2O3 plate faces, and the origin of Texture Development was the formation of the phase boundaries with thestructure. The degree of orientation was determined by the grain size of BNKT grains, porosity, and the efficiency of Texture evolution. These factors were dependent on the potassium concentration, and the efficiency of Texture evolution was determined by the energy of the phase boundaries with thestructure.
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Origin of Texture Development in Barium Bismuth Titanate Prepared by the Templated Grain Growth Method
Journal of the American Ceramic Society, 2006Co-Authors: Toshio Kimura, Yusuke YoshidaAbstract:Microstructure Development was examined for BaBi4Ti4O15 prepared by the templated grain growth method, and the origin of Texture Development was discussed. The microstructure Development in a compact composed of a platelike template and equiaxed matrix grains was characterized as follows: (1) the template grains thickened at an early stage; (2) the matrix grains changed their shape from equiaxed to platelike, and simultaneously, the plate faces aligned parallel to those of template grains; and (3) a group of large grains with mutually parallel alignment was formed by prolonged heating at high temperature. Texture developed during these microstructural changes, and process (2) made the greatest contribution toward Texture Development.
Yoshiyuki Sakuma - One of the best experts on this subject based on the ideXlab platform.
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Effects of processing methods on Texture Development and densification in SrBi4Ti4O15 ceramics
Journal of Materials Science, 2005Co-Authors: Yoshiyuki Sakuma, Toshio KimuraAbstract:This paper deals with the effects of preparation methods on the Texture Development and densification in Textured SrBi 4 Ti 4 O 15 (SBT) ceramics. The specimens were prepared by the oriented consolidation of anisotropic particles (OCAP), templated grain growth (TGG) and reactive templated grain growth (RTGG) methods. The specimens with extensive Texture were obtained by all methods except for TGG with small template and large matrix particles. The origin of extensive Texture Development was the growth of aligned platelike particles. A characteristic of microstructure was the formation of colonies, in which platelike grains contacted face-to-face. The size of colonies was dependent on the preparation method, and determined the size of pores between colonies, which had a large effect on the sintered density. The OCAP and RTGG methods gave the green compacts composed of only platelike particles and large colonies and pores formed during sintering. The TGG method gave the green compacts composed of platelike and equiaxed particles and prevented the formation of large colonies and pores during sintering. Thus, the dense, highly-Textured SBT ceramics were obtained by the TGG method.
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Texture Development in piezoelectric ceramics by templated grain growth using heterotemplates
Journal of the European Ceramic Society, 2005Co-Authors: Toshio Kimura, Yoshiyuki Sakuma, Masatoshi MurataAbstract:Abstract The mechanisms of Texture Development were examined in the 〈0 0 1〉-Textured bismuth layer-structured ferroelectrics (BLSF) prepared by the templated grain growth (TGG) method using BLSF templates with the composition different from that of the matrix. The formation and growth of layers of matrix grains on the templates were main mechanism for the Texture Development. Another mechanism of Texture Development was the formation of face-to-face contact between platelike template grains and matrix grains grown to be platelike.
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Mechanisms of Texture Development in Bismuth Layer-Structured Ferroelectrics Prepared by Templated Grain Growth
Journal of Electroceramics, 2004Co-Authors: Yoshiyuki Sakuma, Toshio KimuraAbstract:The mechanism for Texture Development in bismuth layer-structured ferroelectrics prepared by the templated grain growth method was examined using template and matrix grains with different chemical compositions. The template particles used were platelike Bi4Ti3O12 and Ba6Ti17O40 for SrBi4Ti4O15-matrix composites and platelike Ba6Ti17O40 and Sr3Ti2O7 for BaBi4Ti4O15-matrix. The 〈001〉-Texture developed in all composites examined. The origins of Texture Development were the growth of matrix grains to be platelike and the formation of face-to-face contact between the template and matrix grains and also between matrix grains.
Masatoshi Murata - One of the best experts on this subject based on the ideXlab platform.
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Texture Development in piezoelectric ceramics by templated grain growth using heterotemplates
Journal of the European Ceramic Society, 2005Co-Authors: Toshio Kimura, Yoshiyuki Sakuma, Masatoshi MurataAbstract:Abstract The mechanisms of Texture Development were examined in the 〈0 0 1〉-Textured bismuth layer-structured ferroelectrics (BLSF) prepared by the templated grain growth (TGG) method using BLSF templates with the composition different from that of the matrix. The formation and growth of layers of matrix grains on the templates were main mechanism for the Texture Development. Another mechanism of Texture Development was the formation of face-to-face contact between platelike template grains and matrix grains grown to be platelike.
