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A Mössbauer study of synthetic leucophosphite, KFe 2 (PO 4 ) 2 (OH)·2H 2 O is reported. The sample was prepared by the reaction of synthetic goethite (α-FeOOH) with a K-phosphate solution of pH 2 at 373 K for 20 days. The obtained cell parameters are a = 9.771(1), b = 9.675(2), c = 9.747(2) Å, β = 102.45(1)°. The Mössbauer spectra from 295 K down to 40 K show the existence of two Fe 3+  doublets with ΔE Q1  ≈ 0.62 mm/s and ΔE Q2  ≈ 0.91 mm/s (at 80 K), respectively, whereas for lower temperatures the spectra are composed of two sextets with H hf1  ≈ 48.3 T and H hf2  ≈ 48.8 T at 4.2 K. The magnetic transition temperature was determined to be 36 K from a Mössbauer thermoscan experiment. The magnetic ordering is presumed to be antiferromagnetic. The temperature variations of the hyperfine fields cannot be explained by the simple molecular field approximation. Using a model that takes into account the exchange magnetostriction associated to a non-second-order transition, an excellent reproduction of the H hf (T) curves was obtained.

Mössbauer spectroscopic study of synthetic leucophosphite, KFe 2 (PO 4 ) 2 (OH)·2H 2 O