Relationship between Conductivities and Compositions Determined by EPMA for Apatite-type Ndx(SiO4)6O1.5x|12 Single Crystals

Susumu NAKAYAMA*, Mikio HIGUCHI*,† and Kazuyoshi UEMATSU††

Department of Applied Chemistry and Biotechnology, Niihama National College of Technology; Niihama-shi 792-8580 Japan
Divison of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University; Sapporo-shi 060-8628 Japan
†† Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University; Niigata-shi 950-21 Japan

Four kinds of single crystals of hexagonal apatite type Ndx(SiO4)6O1.5x|12 (x=8--9.33), which is an oxide ionic conductor, were prepared by the FZ method and samples for electrical measurements (the conductivity components parallel and perpendicular to the c-axis of single crystal) were prepared. The conductivities of the component parallel to the c-axis were higher about one order of magnitude, compared with those of the component perpendicular. The values of (Nd/Si)×6 of four kinds of samples were 8.63, 8.67, 8.91 and 9.33 determined by electron probe micro-analysis. The conductivity was slightly increased with decreasing the value of (Nd/Si)×6.

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