EFFECTS OF YTTRIUM AND SODIUM ADDITION ON PREPARATION AND HUMIDITY SENSITIVITY OF POROUS APATITE CERAMICS
スポンサーリンク
概要
- 論文の詳細を見る
Sodium yttrium calcium-oxyhydroxyapatites powders with compositions of {[Ca_9.98-0.9xY_0.9xNa_0.02](PO_4)_6[(OH)_1.98-0.9xO_0.9x□_0.02], x=0-1.0(here □ denotes vacancies at OH lattice sites} were synthesized by the wet process. Porous(Ca, Y, Na)-Ap(here Ap denotes apatite)ceramics having apparent porosities of around 33% were prepared at high temperature under steam flow. On the basis of the results of X-ray diffraction, all the obtained ceramics exhibited almost single-phase(Ca, Y, Na)-Ap with hexagonal structure. The impedance for all samples linearly changed from 10^6 to 10^4 Ω at 50℃ in the humidity range of 40-95%RH. Apatites produced by substituting Y^3+ and Na^+ for Ca^2+ in apatite structure showed an excellent conductivity. This is attributed to both ordinary protonic conduction caused by the self-dissociation of physically adsorbed water and another conduction caused by OH vacancies introduced by substituting Y^3+ and Na^+ for Ca-sites.
- 社団法人日本材料学会の論文
- 1999-06-15
著者
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FUJII Satoshi
Department of Neurosurgery, Yokohama City University School of Medicine
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KOBUNE Masafumi
Department of Material Science Chemistry, Graduate School of Engineering, University of Hyogo
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Fujii S
Sumitomo Electric Ind. Ltd. Hyogo Jpn
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Fujii Satoshi
Department Of Applied Chemistry Faculty Of Engineering Himeji Institute Of Technology
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Fujii S
It Components Division Sumitomo Electric Industries Ltd.
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Setter N
Swiss Federal Inst. Technol. Lausanne Che
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Setter Nava
Ceramics Laboratory Epfl Swiss Federal Institute Of Technology
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MINESHIGE Atsushi
Department of Applied Chemistry, Faculty of Engineering, Himeji Institute of Technology
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IIDA Hiromi
Department of Apllied Chemistry, Faculty of Engineering, Himeji Institute of Technology
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SORAI Yoshiaki
Department of Apllied Chemistry, Faculty of Engineering, Himeji Institute of Technology
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Iida Hiromi
Department Of Apllied Chemistry Faculty Of Engineering Himeji Institute Of Technology
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Sorai Yoshiaki
Department Of Apllied Chemistry Faculty Of Engineering Himeji Institute Of Technology
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Kobune M
Dep. Of Materials Sci. And Chemistry Univ. Of Hyogo
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Mineshige Atsushi
Department Of Applied Chemistry Faculty Of Engineering Himeji Institute Of Technology
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MINESHIGE Atsushi
Materials Science and Chemistry, University of Hyogo
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Mineshige A
Materials Science And Chemistry University Of Hyogo
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