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BaFe2(PO4)2 consists of honeycomb layers containing high-spin d6 Fe2+ ions. It is the first genuine two-dimensional oxide Ising ferromagnet (FM) with uniaxial magnetism parallel to the crystallographic three-fold axis. BaFe2(PO4)2 undergoes a re-entrant structural transition between 170 K and its FM critical temperature (65.5 K) owing to competition between the uniaxial magnetism and Jahn–Teller instability.
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Kabbour et al. (2012) studied this question.
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