日本結晶学会誌
Online ISSN : 1884-5576
Print ISSN : 0369-4585
ISSN-L : 0369-4585
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c軸配向アパタイト型ケイ酸ランタン多結晶体の作製と酸化物イオン伝導
福田 功一郎
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ジャーナル フリー

2014 年 56 巻 1 号 p. 43-48

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We have successfully prepared the three types of highly c-axis-oriented polycrystalline materials of lanthanum silicate apatite(La9.33Si6O26, La9.50Si6O26.25 and La9.50Si5.87O26)by isothermal heating of the diffusion couples consisting of La2SiO5 and La2Si2O7 at 1873 K for 50-100 h. The resulting polycrystals were subsequently characterized using polarizing microscopy, X-ray diffration and impedance spectroscopy. The annealed couples were mechanically processed, and the thin-plate electrolytes consisting of the grain-aligned polycrystals were obtained. The oxide-ion conductivity along the c-axis of oxygen hyper-stoichiometric apatite, La9.50Si6O26.25,was ca. 2.5 times higher than that of oxygen stoichiometric apatite, La9.33Si6O26, at 723-973 K. The polycrystalline material of Si-deficient apatite, La9.50Si5.87O26, showed, among the three types of apatite polycrystals, the highest conductivity above 850 K; the conductivity at 873 K was 4.2×10−2 S/cm.

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