Acta Crystallographica Section B

Structural Science

Volume 61, Part 5 (October 2005)

research papers

Acta Cryst. (2005). B61, 481-485 [ doi:10.1107/S0108768105017362 ]

Evidence for differentiation in the iron-helicoidal chain in GdFe₃(BO₃)₄

S. A. Klimin, D. Fausti, A. Meetsma, L. N. Bezmaternykh, P. H. M. van Loosdrecht and T. T. M. Palstra

Abstract: A single-crystal X-ray structure study of gadolinium triiron tetraborate, GdFe(BO), at room temperature and at 90 K is reported. At room temperature GdFe(BO) crystallizes in a trigonal space group, 32 (No. 155), the same as found for other members of the iron borate family RFe(BO). At 90 K the structure of GdFe(BO) transforms to the space group 3 $_{1}$ 21 (No. 152). The low-temperature structure determination gives new insight into the weakly first-order structural phase transition at 156 K and into the related Raman phonon anomalies. The presence of two inequivalent iron chains in the low-temperature structure provides a new perspective on the interpretation of the low-temperature magnetic properties.

Keywords: iron borates; phase transitions; low-temperature magnetism.


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