Abstract
Tetravalent terbium perovskites, BaTbO 3 and SrTbO 3, were prepared, and their magnetic susceptibilities and electron paramagnetic resonance (EPR) spectra were measured. Both the compounds showed antiferromagnetic transitions at 32.7 and 30.5 K, respectively. The effective magnetic moment of terbium is 7.96 μ B, which is very close to the theoretical value of the Tb 4+ ion. The EPR spectra could be measured at room temperature. The spectra were broad and the g-values of BaTbO 3 and SrTbO 3 were 2.00 and 1.97, respectively. These results also show that the oxidation state of terbium is not trivalent, but tetravalent. The deviation of the g-value from 2.00 for SrTbO 3 is due to the large crystal field distortion from octahedral symmetry around the terbium ion.
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