Mechanochemically-assisted Synthesis of LaVO<sub>4</sub> and LaVO<sub>3</sub>

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  • Abe Osami
    Department of Biofunctional Engineering, Faculty of Engineering, Ibaraki University
  • Sakane Kasumi
    Department of Biofunctional Engineering, Faculty of Engineering, Ibaraki University
  • Mitachi Sensyu
    Fine Ceramics Laboratory, Hokko Chemical Industry, Co. Ltd.
  • Yamada Tomoe
    Fine Ceramics Laboratory, Hokko Chemical Industry, Co. Ltd.
  • Banno Tadashi
    Fine Ceramics Laboratory, Hokko Chemical Industry, Co. Ltd.

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Other Title
  • メカノケミカル法を利用した LaVO<sub>4</sub> および LaVO<sub>3</sub> の合成
  • メカノケミカル法を利用したLaVO₄およびLaVO₃の合成
  • メカノケミカルホウ オ リヨウ シタ LaVO ₄ オヨビ LaVO ₃ ノ ゴウセイ

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Mechanochemical synthesis and solvothermal crystallization of LaVO4 and LaVO3 have been studied. Amorphous LaVO4 powders were mechanochemically synthesized by the mixing-grinding operation of La2O3 and V2O5 in Acetone containing water as the grinding liquid. The amorphous ground products were crystallized to monoclinic-LaVO4 by the solvothermal post treatment at 120℃ for 12 h. The BET surface area of the LaVO4 powder after the calcination at 600℃ was 9.6～26.3 m2 g-1. The reflux treatment was also applicable to the crystallization. For the synthesis of LaVO3, the mechanochemical reduction of V2O5 in organic vapors was applicable. The ground product prepared by mixing-grinding of La2O3 and V2O5 in acetone vapor was crystallized to the single phase tetragonal-LaVO3 after the calcination at 800℃ in Ar, although the mechanochemical/solvothermal products contained a certain amount of LaVO4 after the calcination at the same condition.

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