Relationship between Pre-Exponential Factor and Activation Energy of Conductivity in Sintered Ln9.33+x/3Si6-xMxO26 (Ln=La, Nd, Sm, M=Al, Gd) with Apatite-like Structure
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概要
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Electrical conductivity of a series of Ln9.33+x/3Si6-xMxO26 (Ln=La, Nd and Sm, M=Al and Ga) sinters was examined. The pre-exponential factor and activation energy of the ionic conduction were well related by Meyer-Neldel rule, i.e., G=G00 exp (ΔE/kT0) exp (-ΔE/kT). Most of the sinters were composed with an apatite-like phase in major and sub-products such as LnSiO5 and Ln2O3 in minor proportions. The single phases with apatite-like structure were obtained for the composition of x=1.5. At this composition, the activation energy increased with a decrease in the ionic radius of Ln. The lowest activation energy and highest pre-exponential factor were observed for the combination of Ln=La and M=Al. This result was interpreted by considering the formation of the 4e sites for oxygen with under occupancy and oxygen ion interstitials surrounded with six 6h(La) sites.
- 公益社団法人 日本セラミックス協会の論文
著者
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Sadaoka Yoshihiko
Department Of Applied Chemistry Faculty Of Engineering Ehime University
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Itagaki Yoshiteru
Department of Chemistry, Columbia University
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Takeda Naoki
Department of Biological Resource Sciences, Akita Prefectural University
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ITAGAKI Yoshiteru
Department of Materials Science and Biotechnology, Graduate School of Engineering and Science, Ehime University
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