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Scientific article
English

Raman spectroscopy of M3B7O13X boracites (M = Cr,Co,Ni,Cu,Zn,Cd; X = Cl,Br,I)

Published inJournal of Raman spectroscopy, vol. 45, no. 4, p. 267-273
Publication date2014
Abstract

We report results of a Raman study on single crystals of 16 boracites M3B7O13X (M= Cr,Co,Ni,Cu,Zn,Cd; X = Cl,Br,I) over a broad temperature range. The Ramanmodes for all boracites in their high-temperature prototype cubic (F43c) phase are compared. With decreasing temperature,most (but not all) compounds present a transition to the low-temperature orthorhombic phase (Pca21) or to a sequence of orthorhombic, monoclinic (Pa), and trigonal (R3c) phases. The variations of the Raman spectra through different phases are studied in detail. Special attention is paid to the temperature hysteresis near the transitions and the dependence of transition temperature on the direction of crystal growth for the same material.

Keywords
  • Boracites
  • Phonons
  • Crystallographic transitions
  • Growth sectors
Citation (ISO format)
ILIEV, Milko N., SCHMID, Hans. Raman spectroscopy of M<sub>3</sub>B<sub>7</sub>O<sub>13</sub>X boracites (M = Cr,Co,Ni,Cu,Zn,Cd; X = Cl,Br,I). In: Journal of Raman spectroscopy, 2014, vol. 45, n° 4, p. 267–273. doi: 10.1002/jrs.4458
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ISSN of the journal0377-0486
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