日本化学会誌(化学と工業化学)
Online ISSN : 2185-0925
Print ISSN : 0369-4577
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水溶液からのモナズ石型バナジン酸ランタン(LaVO4)の低温合成
大門 啓志呉 敏引地 康夫和田 直斗松原 孝至太田 敏孝
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2002 年 2002 巻 3 号 p. 455-458

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Monazite-type monoclinic form lanthanum orthovanadate (M-type LaVO4) was synthesized by precipitating it from the mixed solution of lanthanum chloride and ammonium vanadate (V) with the mixing atomic ratio (La/V) = 1 at 20 °C in the pH 5 to 9. However, M-type LaVO4 tended to coexist with zircon-type tetragonal form lanthanum orthovanadate (Z-type LaVO4) at pHs 5–8. The single phase M-type LaVO4 was obtained only pH 9. The La/V atomic ratio obtained from the chemical analysis (ICP method) was in the range 0.99–1.01. The specific surface area and crystallite size were 250 m2/g and 22 nm, respectively. Relative density larger than 95% was achieved when the green compacts of M-LaVO4 were sintered at 1500 °C for 3 h in air.

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© 2002 The Chemical Society of Japan
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