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Single-crystal Mossbauer measurements show that the Neel temperature of K 2 FeF 5 increases for magnetic fields applied perpendicular to the easy axis and decreases for magnetic fields applied parallel to the easy axis. This behaviour is consistent with theoretical results for a quasi-one-dimensional Heisenberg antiferromagnet. Calculations of the magnetic phase diagram have been performed and these are in excellent agreement with the experimental data.
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Boersma et al. (1982) studied this question.
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