Abstract
We have synthesized perovskite oxide BaPb1-xZrxO3 by solid-state reaction in different atmospheres and performed x-ray diffraction (XRD) analyses, electrical resistivity and thermoelectric power measurements on them. Nearly single-phase samples with cubic symmetry were obtained in the range 0.0<x0.25. As x increased, a metal-insulator (MI) transition occurred at a critical doping level xc, which depended on the sintering atmosphere of the samples. Meanwhile, a jump in resistivity was found. At low temperatures (13 K T100 K), the temperature dependence of resistivity followed the power law when 0<x<xc and the hopping law when x xc. When prepared in oxygen and in air, the resistivity decreased linearly with the rising temperature in the range between 100 and 300 K. However, the unusual linear behaviour was absent when the doped oxides were sintered in N2. An anomalous broad peak was also observed in the thermoelectric power of the air-sintered samples. The results are discussed in terms of the effects of disorder and electron-electron interactions, oxygen vacancies and the crystal-field splitting of the 4d levels of transition metal Zr.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
