Highly Conductive Oxides, CeVO4, Ce1−xMxVO4−0.5x(M=Ca, Sr, Pb) and Ce1−yBiyVO4, with Zircon-Type Structure Prepared by Solid-State Reaction in Air
作者:Akiteru Watanabe
DOI:10.1006/jssc.2000.8773
日期:2000.8
The zircon-type phases, CeVO4, Ce1−xMxVO4−0.5x (0≤x≤0.41 for M=Ca, 0≤x≤0.21 for M=Sr, and 0≤x≤0.1 for M=Pb) and Ce1−yBiyVO4 (0≤y≤0.68), have been prepared in air by heating the stoichiometric mixture of CeO2, V2O5, CaCO3, SrCO3, PbO, and Bi2O3. During solid-state reaction, the spontaneous reduction of Ce(IV) to Ce(III) begins above 500°C and proceeds rapidly at about 666°C in conjunction with the melting
的锆石类相,CEVO 4,CE 1 X中号X VO 4-0.5 X(0≤ X ≤0.41对于中号=钙,0≤ X ≤0.21对于中号= Sr和0≤ X ≤0.1对于中号=铅)和Ce 1- ÿ毕Ý VO 4(0≤ Ý ≤0.68),已经在空气中制备加热的CeO的化学计量混合物2,V 2 ø 5,碳酸钙3,的SrCO 3,PbO和铋2 ö 3。在固态反应过程中,Ce(IV)自发还原为Ce(III)在高于500°C时开始还原,并在约666°C的温度下迅速进行还原,并伴随V 2 O 5的熔化。所有这些相都具有高电导率。特别地,相Ce 1- x M x VO 4-0.5 x(M = Ca,Sr和Pb)显示出极高的值。通过塞贝克效应将化合物CeVO 4表征为p型半导体。