Editor: Baruch Grinbaum
Vol no. 1, Issue 1
Feb. 2003
Eran Aizinger, Ronen Ben David, Hanady Yaseen and Yoed Tsur (2003), "Solubility
of Pr in Barium Titanate"
Chemical
Engineering Department, Technion – Israel Institute of Technology
The
solubility of Pr in barium titanate was studied within the framework of a final
undergraduate project. Two series of samples were investigated. The first one
was a Ba-rich series. In this series it was found that the solubility limit is
between 4-mol% and 10-mol% Pr, and the second phase that was found above the
solubility limit was (Pr doped) Ba2TiO4. The second one
had Ba/Ti ratio equals 1. In this series the solubility limit was between
15-mol% and 20-mol% Pr. DSC test on a sample with 10-mol% Pr and Ba/Ti=1 shows a
very broad peak in the temperature range –50ºC to 50ºC. This can be
a result of either valence change of the Pr ions on the Ti sites within that
temperature range, in accord with earlier results, or a broaden rhombohedral-tetragonal
phase transition of the barium titanate.
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