Preparation and Low-Temperature Magnetic Properties of the Terbium Oxides

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Abstract
The magnetic properties of terbium oxide phases (Tb2O3 cubic and monoclinic polymorphs, TbO1.715, TbO1.809, TbO1.823, and TbO2) have been measured between 1.4° and 300°K. With the exception of TbO1.809, each of these phases is observed to order magnetically at low temperatures. The ordering is predominantly antiferromagnetic, several of the lower oxide phases show metamagnetic behavior, wherein the observed moment has a nonlinear dependence upon the applied field at fields above a critical value, approximately 2000 Oe. The phase TbO1.023 exhibits a tendency toward ferrimagnetic alignment as evidenced by remanent magnetization at 1.4°K. TbO2 is antiferromagnetic with a Néel temperature of 3°K. At higher temperatures, in the paramagnetic region all of the oxide phases give effective Bohr magneton numbers close to the expected values for the free ions.

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