The structural and magnetic phase transitions in the series of compounds (CnH2n + 1 NH3)2MnCl4 with n = 5,7, and 9 are studied by means of X-ray diffraction, differential scanning calorimetry, and magnetic susceptibility experiments. Like the previously studied first members of the series (n = 1 to 3), these perovskite-like layer compounds undergo at low temperature an antiferromagnetic transition with weak ferromagnetic moment due to spin canting. In the paramagnetic domain, the magnetic susceptibility is sensitive to a first-order phase transition which could be due to the freezing of alkyl ammonium groups.
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Flandrois et al. (1995) studied this question.
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