The lambda transition in ammonium chloride at 242 K has been investigated using 57Fe2+ impurity atoms. These probably reside on interstitial sites in an effective [FeCl4(H2O)2]2– complex. The temperature dependence of the quadrupole splitting reveals a larger tetragonal distortion of the impurity site in the low-temperature ordered state of the NH4Cl.
T. C. Gibb, N. N. Greenwood and M. D. Sastry, J. Chem. Soc., Dalton Trans., 1972, 1896 DOI: 10.1039/DT9720001896
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