Phase Relations in the Pyrochlore-Rich Part of the Bi2O3−TiO2−Nd2O3 System
In this study we used solid-state synthesis to determine the phase relations in the pyrochlore-rich part of the Bi2O3−TiO2−Nd2O3 system at 1100°C. The samples were analyzed using X-ray powder diffraction and scanning electron microscopy with energy- and wavelength-dispersive spectroscopy. A single-phase pyrochlore ceramic was obtained with the addition of 4.5 mol% of Nd2O3. We determined the solubility limits for the three solid solutions: (i) the pyrochlore solid solution Bi(1.6–1.08x)NdxTi2O(6.4+0.3x), where 0.25<x<0.96; (ii) the solid solution Bi4−xNdxTi3O12, where 0<x<2.6; and (iii) the Nd2−xBixTi2O7 solid solution, where 0<x<0.35. The determined phase relations in the pyrochlore-rich part are presented in a partial phase diagram of the Bi2O3−TiO2−Nd2O3 system in air at 1100°C.
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Document Type: Research Article
Affiliations: Jožef Stefan Institute, Advanced Materials Department, 1000 Ljubljana, Slovenia
Publication date: October 1, 2009