Gadolinium orthophosphate (GdPO4) follows the Curie‐Weiss law in the paramagnetic region. It becomes antiferromagnetic at 225°K, and exhibits weak ferromagnetism at lower temperatures. The origin of weak ferromagnetism is attributed to anisotropic exchange. A model of ferromagnetic and antiferromagnetic linkages of varied strengths fits qualitatively the magnetic properties of GdPO4.
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F. F. Y. Wang (1966) studied this question.
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