Mutual Solid Solubility and Phase Equilibrium in the System BaTiO₃–BaCeO₃

Abstract

A series of (1-x)BaTiO3–xBaCeO3 (x = 0.1–1.0) ceramics were prepared at 1480 °C by a cold-pressing ceramic technique. The mutual solid solubility and phase equilibrium in the system BaTiO3–BaCeO3 were investigated by X-ray diffraction analysis, scanning electron microscopy, and Raman spectroscopy. The results indicate that no pure BaCeO3 phase can be separated from the Ba(Ti1-x Ce x )O3 phase. The mutual solid solution limits of BaCeO3 and BaTiO3 are given. In the range of 0.4 ≤x ≤0.8, the system is well separated into the Ce- and Ti-rich Ba(Ti,Ce)O3 perovskite phases, corresponding to Ce/Ti ratios of 4.3:1 and 1:2, respectively.

Raman Evidence for Ba-Site Ce3+ in BaTiO3

“…As a matter of fact, the 840 cm À1 band also appeared in the spectra of the Ba(Ti 1Àx Ce x )O 3 (x ¼ 0:1) ceramic that we prepared under the same conditions as the present BTC samples (1480 C for 24 h), as shown in Fig. 6, 19) which are cited from Ref. 19 and enlarged for observation.…”

“…6, 19) which are cited from Ref. 19 and enlarged for observation. In the present work, the Ce concentration (x) BTC is limited to between 0.03 and 0.07 and this band can be detected in all the samples.…”