Abstract

Debye-Waller factors f were determined over the temperature range 4.2 to 298°K in Fe(bipy)2(NCS)2 from 57Fe Mössbauer spectra (bipy = 2,2'-bipyridyl). Whereas magnetic data and other physical properties show an abrupt change at the temperature of a cooperative 5T2 ⇌ 1A1 transition, Tc = 214°K, a continuous change of -ln f is found. The significance of this result is discussed.

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