The Experts below are selected from a list of 109839 Experts worldwide ranked by ideXlab platform
Yasuhiko Ito - One of the best experts on this subject based on the ideXlab platform.
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optical properties of zinc nitride formed by molten salt Electrochemical Process
Thin Solid Films, 2005Co-Authors: Kazuaki Toyoura, Hiroyuki Tsujimura, Takuya Goto, Kan Hachiya, Rika Hagiwara, Yasuhiko ItoAbstract:Abstract We formed a Zn3N2 film by potentiostatic electrolysis of a zinc electrode at 1.6 V (vs. Li+/Li) in a LiCl–KCl–Li3N melt at 673 K. From the X-ray diffraction analysis, the obtained film was found to be a single phase of Zn3N2. From the X-ray photoelectron spectroscopy analysis, in the outer surface of the film, small amounts of Zn(OH)2 and ZnO were observed, which are believed to form after electrolysis. As a result of reflectance measurement in the ultraviolet, visible and near infrared region, it was clarified that Zn3N2 has a direct band gap of 1.01 eV.
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formation and phase control of co gd alloy films by molten salt Electrochemical Process
Journal of Alloys and Compounds, 2004Co-Authors: Tetsuro Kubota, Takahisa Iida, Toshiyuki Nohira, Yasuhiko ItoAbstract:Abstract The Electrochemical formation of Gd–Co alloys was investigated in a molten LiCl–KCl–GdCl 3 (0.5 mol%) system at 723 K. A CoGd 3 film (12 μm thickness) was formed on a Co substrate by cathodic electrolysis at 0.43 V (versus Li + /Li) for 1 h. The formed CoGd 3 alloy phase changed to other alloy phases by anodic dissolution of Gd. The formation potentials of CoGd 3 , Co 2 Gd and Co 7 Gd 2 were found to be 0.55, 0.80 and 0.96 V, respectively.
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Electrochemical surface nitriding of pure iron by molten salt Electrochemical Process
Journal of Alloys and Compounds, 2004Co-Authors: Hiroyuki Tsujimura, Takuya Goto, Yasuhiko ItoAbstract:Abstract Electrochemical surface nitriding of pure iron was investigated in molten LiCl–KCl–Li 3 N systems at 773 K. An outer compound layer and an inner diffusion layer were obtained by means of potentiostatic electrolysis at 1.00 V (versus Li + /Li). From XRD and SEM analyses, it was confirmed that the obtained compound layer consisted of e-Fe 2–3 N and γ′-Fe 4 N; the free energies of formation of the two nitrides are positive and the equilibrium nitrogen partial pressure of those are of the order of 10 4 atm at 773 K. This result suggests that an apparent nitrogen partial pressure of at least the order of 10 4 atm was imposed by the adsorbed nitrogen atoms (N ads ) formed by anodic oxidation of nitride ion (N 3− ) at the iron electrode surface.
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surface nitriding of sus 304 austenitic stainless steel by a molten salt Electrochemical Process
Journal of The Electrochemical Society, 2004Co-Authors: Hiroyuki Tsujimura, Takuya Goto, Yasuhiko ItoAbstract:Electrochemical surface nitriding of SUS 304 austenitic stainless steel was investigated in a molten LiCl-KCl-Li 3 N system at 773 K, and surface hardening by this molten salt Electrochemical Process without any special pretreatment was confirmed. From X-ray photoelectron spectroscopy and X-ray diffraction analyses, it was found that the surface nitrided layer contained CrN precipitates in Fe-Ni matrix. The square of the thickness of the surface nitrided layer was proportional to the electrolysis time. The rate constant, Kp, increased as the applied potential was more positive. This finding indicated that the chemical potential of adsorbed nitrogen (N ads ) on SUS 304 stainless steel electrodes depended on the applied potential and it affected nitrided layer growth. Furthermore, surface nitriding of a SUS 304 stainless steel tube was achieved. It was confirmed that adhesive coherent nitrided layers formed both on the outside and inside of the tube. These results suggested that this Electrochemical surface nitriding Process can be applied to specimens of various shapes.
Hiroyuki Tsujimura - One of the best experts on this subject based on the ideXlab platform.
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optical properties of zinc nitride formed by molten salt Electrochemical Process
Thin Solid Films, 2005Co-Authors: Kazuaki Toyoura, Hiroyuki Tsujimura, Takuya Goto, Kan Hachiya, Rika Hagiwara, Yasuhiko ItoAbstract:Abstract We formed a Zn3N2 film by potentiostatic electrolysis of a zinc electrode at 1.6 V (vs. Li+/Li) in a LiCl–KCl–Li3N melt at 673 K. From the X-ray diffraction analysis, the obtained film was found to be a single phase of Zn3N2. From the X-ray photoelectron spectroscopy analysis, in the outer surface of the film, small amounts of Zn(OH)2 and ZnO were observed, which are believed to form after electrolysis. As a result of reflectance measurement in the ultraviolet, visible and near infrared region, it was clarified that Zn3N2 has a direct band gap of 1.01 eV.
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Electrochemical surface nitriding of pure iron by molten salt Electrochemical Process
Journal of Alloys and Compounds, 2004Co-Authors: Hiroyuki Tsujimura, Takuya Goto, Yasuhiko ItoAbstract:Abstract Electrochemical surface nitriding of pure iron was investigated in molten LiCl–KCl–Li 3 N systems at 773 K. An outer compound layer and an inner diffusion layer were obtained by means of potentiostatic electrolysis at 1.00 V (versus Li + /Li). From XRD and SEM analyses, it was confirmed that the obtained compound layer consisted of e-Fe 2–3 N and γ′-Fe 4 N; the free energies of formation of the two nitrides are positive and the equilibrium nitrogen partial pressure of those are of the order of 10 4 atm at 773 K. This result suggests that an apparent nitrogen partial pressure of at least the order of 10 4 atm was imposed by the adsorbed nitrogen atoms (N ads ) formed by anodic oxidation of nitride ion (N 3− ) at the iron electrode surface.
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surface nitriding of sus 304 austenitic stainless steel by a molten salt Electrochemical Process
Journal of The Electrochemical Society, 2004Co-Authors: Hiroyuki Tsujimura, Takuya Goto, Yasuhiko ItoAbstract:Electrochemical surface nitriding of SUS 304 austenitic stainless steel was investigated in a molten LiCl-KCl-Li 3 N system at 773 K, and surface hardening by this molten salt Electrochemical Process without any special pretreatment was confirmed. From X-ray photoelectron spectroscopy and X-ray diffraction analyses, it was found that the surface nitrided layer contained CrN precipitates in Fe-Ni matrix. The square of the thickness of the surface nitrided layer was proportional to the electrolysis time. The rate constant, Kp, increased as the applied potential was more positive. This finding indicated that the chemical potential of adsorbed nitrogen (N ads ) on SUS 304 stainless steel electrodes depended on the applied potential and it affected nitrided layer growth. Furthermore, surface nitriding of a SUS 304 stainless steel tube was achieved. It was confirmed that adhesive coherent nitrided layers formed both on the outside and inside of the tube. These results suggested that this Electrochemical surface nitriding Process can be applied to specimens of various shapes.
Zhongfu Zhou - One of the best experts on this subject based on the ideXlab platform.
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electrosynthesis of ti3aic2 from oxides carbon precursor in molten calcium chloride
Journal of Alloys and Compounds, 2018Co-Authors: Xingli Zou, Zhongfu Zhou, Xiaolu Xiong, Kai Zheng, Xueliang XieAbstract:Abstract Layered micron-scale Ti3AlC2 powders have been successfully synthesized from TiO2/Al2O3/C precursor by a facile Electrochemical Process at 900 °C and 3.1 V in molten CaCl2. Porous TiO2/Al2O3/C mixture pellet was served as the cathode and a graphite rod was employed as the anode. The influence of carbon content on the products was systematically investigated. The lattice parameters of the electrosynthesized Ti3AlC2 were determined. In addition, three reaction periods from TiO2/Al2O3/C to Ti3AlC2 including the generation of CaTiO3/Ca12Al14O33 intermediate compounds, the reduction of the oxides/compounds and the formation of Ti3AlC2 were investigated and confirmed. The results show that the Electrochemical Process is of great potential to the facile synthesis of Ti3AlC2, which may also have implication for the production of other Mn+1AXn phases from their inexpensive and abundantly available oxides precursors.
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direct selective extraction of titanium silicide ti5si3 from multi component ti bearing compounds in molten salt by an Electrochemical Process
Electrochimica Acta, 2011Co-Authors: Xingli Zou, Zhongfu Zhou, Weizhong DingAbstract:Zou, X., Lu, X., Zhou, Z., Li, C., & Ding, W. (2011). Direct selective extraction of titanium suicide Ti5Si3 from multi-component Ti-bearing compounds in molten salt by an Electrochemical Process. Electrochimica Acta, 56 (24), 8430-8437.
Takuya Goto - One of the best experts on this subject based on the ideXlab platform.
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optical properties of zinc nitride formed by molten salt Electrochemical Process
Thin Solid Films, 2005Co-Authors: Kazuaki Toyoura, Hiroyuki Tsujimura, Takuya Goto, Kan Hachiya, Rika Hagiwara, Yasuhiko ItoAbstract:Abstract We formed a Zn3N2 film by potentiostatic electrolysis of a zinc electrode at 1.6 V (vs. Li+/Li) in a LiCl–KCl–Li3N melt at 673 K. From the X-ray diffraction analysis, the obtained film was found to be a single phase of Zn3N2. From the X-ray photoelectron spectroscopy analysis, in the outer surface of the film, small amounts of Zn(OH)2 and ZnO were observed, which are believed to form after electrolysis. As a result of reflectance measurement in the ultraviolet, visible and near infrared region, it was clarified that Zn3N2 has a direct band gap of 1.01 eV.
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Electrochemical surface nitriding of pure iron by molten salt Electrochemical Process
Journal of Alloys and Compounds, 2004Co-Authors: Hiroyuki Tsujimura, Takuya Goto, Yasuhiko ItoAbstract:Abstract Electrochemical surface nitriding of pure iron was investigated in molten LiCl–KCl–Li 3 N systems at 773 K. An outer compound layer and an inner diffusion layer were obtained by means of potentiostatic electrolysis at 1.00 V (versus Li + /Li). From XRD and SEM analyses, it was confirmed that the obtained compound layer consisted of e-Fe 2–3 N and γ′-Fe 4 N; the free energies of formation of the two nitrides are positive and the equilibrium nitrogen partial pressure of those are of the order of 10 4 atm at 773 K. This result suggests that an apparent nitrogen partial pressure of at least the order of 10 4 atm was imposed by the adsorbed nitrogen atoms (N ads ) formed by anodic oxidation of nitride ion (N 3− ) at the iron electrode surface.
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surface nitriding of sus 304 austenitic stainless steel by a molten salt Electrochemical Process
Journal of The Electrochemical Society, 2004Co-Authors: Hiroyuki Tsujimura, Takuya Goto, Yasuhiko ItoAbstract:Electrochemical surface nitriding of SUS 304 austenitic stainless steel was investigated in a molten LiCl-KCl-Li 3 N system at 773 K, and surface hardening by this molten salt Electrochemical Process without any special pretreatment was confirmed. From X-ray photoelectron spectroscopy and X-ray diffraction analyses, it was found that the surface nitrided layer contained CrN precipitates in Fe-Ni matrix. The square of the thickness of the surface nitrided layer was proportional to the electrolysis time. The rate constant, Kp, increased as the applied potential was more positive. This finding indicated that the chemical potential of adsorbed nitrogen (N ads ) on SUS 304 stainless steel electrodes depended on the applied potential and it affected nitrided layer growth. Furthermore, surface nitriding of a SUS 304 stainless steel tube was achieved. It was confirmed that adhesive coherent nitrided layers formed both on the outside and inside of the tube. These results suggested that this Electrochemical surface nitriding Process can be applied to specimens of various shapes.
Xingli Zou - One of the best experts on this subject based on the ideXlab platform.
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electrosynthesis of ti3aic2 from oxides carbon precursor in molten calcium chloride
Journal of Alloys and Compounds, 2018Co-Authors: Xingli Zou, Zhongfu Zhou, Xiaolu Xiong, Kai Zheng, Xueliang XieAbstract:Abstract Layered micron-scale Ti3AlC2 powders have been successfully synthesized from TiO2/Al2O3/C precursor by a facile Electrochemical Process at 900 °C and 3.1 V in molten CaCl2. Porous TiO2/Al2O3/C mixture pellet was served as the cathode and a graphite rod was employed as the anode. The influence of carbon content on the products was systematically investigated. The lattice parameters of the electrosynthesized Ti3AlC2 were determined. In addition, three reaction periods from TiO2/Al2O3/C to Ti3AlC2 including the generation of CaTiO3/Ca12Al14O33 intermediate compounds, the reduction of the oxides/compounds and the formation of Ti3AlC2 were investigated and confirmed. The results show that the Electrochemical Process is of great potential to the facile synthesis of Ti3AlC2, which may also have implication for the production of other Mn+1AXn phases from their inexpensive and abundantly available oxides precursors.
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direct selective extraction of titanium silicide ti5si3 from multi component ti bearing compounds in molten salt by an Electrochemical Process
Electrochimica Acta, 2011Co-Authors: Xingli Zou, Zhongfu Zhou, Weizhong DingAbstract:Zou, X., Lu, X., Zhou, Z., Li, C., & Ding, W. (2011). Direct selective extraction of titanium suicide Ti5Si3 from multi-component Ti-bearing compounds in molten salt by an Electrochemical Process. Electrochimica Acta, 56 (24), 8430-8437.