Mechano-chemical Synthesis of RbAg_4I_5 and KAg_4I_5 Crystals and Their Silver Ion Conducting Properties
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概要
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A high-energy-ball-milling process was applied to the synthesis of the RbAg<SUB>4</SUB>I<SUB>5</SUB> and KAg<SUB>4</SUB>I<SUB>5</SUB> crystalline phases, which were known to show high Ag<SUP>+</SUP> ion conductivity 2.7×10<SUP>1</SUP> Sm<SUP>-1</SUP> at room temperature. RbI, KI, and AgI were used as raw materials for the mechanical synthesis of the RbAg<SUB>4</SUB>I<SUB>5</SUB> and KAg<SUB>4</SUB>I<SUB>5</SUB> phases. Only 20min-ball milling of a mixture of RbI and AgI led to the formation of RbAg<SUB>4</SUB>I<SUB>5</SUB> phase, and the powder sample after 140 min-ball milling was containing only RbAg<SUB>4</SUB>I<SUB>5</SUB> phase. On the other hand, the preparation of the sample containing only KAg<SUB>4</SUB>I<SUB>5</SUB> phase needed the ball-mill treatment more than 50h.The obtained RbAg<SUB>4</SUB>I<SUB>5</SUB> and KAg<SUB>4</SUB>I<SUB>5</SUB> samples showed high ion conductivity more than 10<SUP>1</SUP> Sm<SUP>-1</SUP> at room temperature, and the conductivities were almost same as those of the RbAg<SUB>4</SUB>I<SUB>5</SUB> and KAg<SUB>4</SUB>I<SUB>5</SUB> crystalline phases reported by Owens et al. The DC polarization measurements suggested that main carrier of the ball-milled samples was silver ions and the silver ion transport numbers of the ball-milled samples were almost unity.
- 社団法人 粉体粉末冶金協会の論文
- 2002-02-15
著者
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Machida N
Konan Univ. Kobe
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Machida Nobuya
Department Of Chemistry Konan University
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Shigematsu T
Konan Univ. Kobe
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Shigematsu Toshihiko
Department Of Chemistry Faculty Of Science Konan University
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PENG Huifen
Department of Chemistry, Konan University
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Peng H
Department Of Chemistry Konan University
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