Structural and electrical conductivity studies on rutile solid solutions [FexTi1-2xMxO2 (M=Nb, Ta)]
作者:P. ESCRIBANO、F. FABREGAT、G. GARCIA-BELMONTE、E. CORDONCILLO、J. BISQUERT、P. ESCRIBANO
DOI:10.1023/a:1004434009509
日期:1998.8
In this study, FexTi1-xMxO2 (M = Nb, Ta; 0 less than or equal to x less than or equal to 0.5) solid solutions have been synthesized from both ceramic and gel methods, and electrical and structural characterization has been carried out. The solid solutions show rutile structure except for the case of FeNbO4, which forms an orthorhombic structure. The electrical behaviour of the system studied corresponds to extrinsic p-type semiconduction and it is related to the presence of Fe(II) ions. Conductivity is enhanced by local distortions of the MO lengths associated with ordering oxidation states such as those in Fe3O4. The distortions are more frequent when the asymmetry is greater (M = Nb). No electrical changes have been detected when the synthesis method is different. (C) 1998 Kluwer Academic Publishers.