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An EPR investigation of NH4AlF4:Fe3+ evidences an order—disorder transition in this compound. The full ordering occurs below 145 K. The P42/mbc space group is proposed for the low temperature phase, and we discuss the fluorine octahedra distortion coupled to the NH4+ ordering. The lineshape evolution from 300 to 145 K is explained by a gradual slowing down of the reorientation rates.
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Leblé et al. (1982) studied this question.
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