Open AccessEvidence for differentiation in the iron‐helicoidal chain in GdFe 3 (BO 3 ) 4
Author(s) -
Klimin S. A.,
Fausti D.,
Meetsma A.,
Bezmaternykh L. N.,
Van Loosdrecht P. H. M.,
Palstra T. T. M.
Publication year - 2005
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
eISSN - 1600-5740
pISSN - 0108-7681
DOI - 10.1107/s0108768105017362
Subject(s) - crystallography , boron , trigonal crystal system , crystal structure , raman spectroscopy , gadolinium , group (periodic table) , space (punctuation) , chemistry , space group , phase transition , order (exchange) , materials science , condensed matter physics , x ray crystallography , physics , metallurgy , diffraction , linguistics , philosophy , organic chemistry , optics , finance , economics
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 R Fe(BO). At 90 K the structure of GdFe(BO) transforms to the space group 321 (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.