Phase equilibria in the Zr0.5Y0.5O1.75-Y0.75Nb0.25O1.75 (1/4Y3NbO7) system have been studied at 1700 °C by a solid-state reaction. X-ray diffraction (XRD) analysis after heat treatment during 64 h indicated that all the compositions formed a cubic solid solution with a fluorite-type structure. The lattice parameter of the fluorite phase decreased with an increase in ZrO2 content. Electrical conductivity for any given temperature increased with increasing ZrO2 content, that is, with decreasing of Y and Nb, although the concentration of oxygen vacancies was kept constant in this system. Conductivity variation was explained by the association of oxygen ion with Nb and that of oxygen vacancies with Y, by comparing the diffuse-scattering intensity of each composition which was measured by XRD.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics