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Scientific article
English

Dielectric and thermal studies of the phase transitions in Cr-Cl boracite

Published inFerroelectrics, vol. 124, no. 1-4, p. 421-426
Publication date1991
Abstract

The antiferro-/paraelec. (.hivin.42m/.hivin.43m at T1 = 264 K) and ferro-/antiferroelec. (mm2/.hivin.42m at T2 ~ 160 K) phase transitions of Cl-Cl boracite were studied by dielec. and thermal anal. The permittivity of both ferroic phases shows small and weakly temp. dependent values (er' = 8.5-13) and discontinuity at the onset of the phase transitions at T1 and T2, which are characterized by improper nature. Above T1 er' decreases with increasing temp., referring to the Curie-Weiss law. Microcalorimetry shows the relevant enthalpy changes: DH1 = 1.98 kJ.mole-1 at T1; DH... = 0.03 kJ.mole-1 at T2. The effect of the hydrostatic pressure on the phase transition temp. is discussed.

Keywords
  • Ferroelec antiferroelec phase chromium chloride boracite
Funding
  • Swiss National Science Foundation - 1990
Citation (ISO format)
YE, Zuo-Guang et al. Dielectric and thermal studies of the phase transitions in Cr-Cl boracite. In: Ferroelectrics, 1991, vol. 124, n° 1-4, p. 421–426. doi: 10.1080/00150199108209476
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Article (Published version)
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Identifiers
ISSN of the journal0015-0193
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