Mössbauer effect study of the deuterated and hydrogenated hydrates of ferrous chloride

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Abstract
A detailed study of isotope effects on Mössbauer hyperfine parameters is presented. Isomer shifts and quadrupole splittings for FeCl2 · n H2O and FeCl2 · n D2O, where n = 1, 2, 4, and 6, were measured between 90 and 273°K. Identical isomer shifts δ were observed for the mono‐, tetra‐, and hexahydrates. Concerning the dihydrates, different δ were found with parallel temperature dependence. For the four studied hydrates, different quadrupole splittings ε were measured for the deuterated and the hydrogenated compounds. The temperature dependence of δ and ε were briefly analyzed with reference to structure and chemical bond considerations. A summary study of Debye‐Waller factors suggested that a comparative investigation of lattice dynamics for the deuterated and hydrogenated hydrates is possible.