Abstract
In addition to previous far-infra-red reflection and Raman studies of K2MnF4, Rb2MnCl4, (CH3NH3)2MnCl4 and (CN3NH3)2FeCl4 with perovskite-type layer structures, we have measured the frequencies of the infra-red active modes of (C2H5NH3)2MnCl4 in the far infra-red. By means of a rigid-ion model with axially symmetric short-range forces it was shown that the short-range forces in KMnF3 and the corresponding intralayer forces in K2MnF4 are equal and that the interlayer forces are of the same type as in alkali halides. The same is true for Rb2MnCl4, and a comparison of the frequencies of the infra-red active phonons of (C2H5NH3)2MnCl4, of (CH3NH3)2MnCl4 and of Rb2MnCl4 shows that the frequencies and therefore the forces are not very different in these materials.
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