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Studies of single-crystalline tetragonal tungsten bronze type K3Fe5F15, a potential magnetoelectric material

Published inFerroelectrics, vol. 162, no. 1-4, p. 51-62
Publication date1994
Abstract

Two phase transitions of K3Fe5F15, at about 290 and 120 K, have been identified by polarized light microscopy and magnetic measurements on a single crystal grown from high temp. soln. with subsequent quenching from 973 K. The former one at about 290 K is a new second-order structural transition from the orthorhombic to a monoclinic phase, as shown by the appearance of new types of ferroelastic domain walls and a rotation of the optical indicatrix around the pseudo-tetragonal principal axis. The transition at about 120 K is second order and magnetic nature, accompanied by anomalies of spontaneous linear birefringence and antiferromagnetic type magnetic susceptibility. The temp. dependence of the magnetization suggests that a spontaneous ferromagnetic component appears in the magnetically ordered phase below 120 K.

Keywords
  • Tetragonal tungsten bronze type fluoride
  • K3Fe5F15
  • Mixed valency
  • Phase transitions
  • Polarized light microscopy
  • Magnetization measurements
Funding
  • Swiss National Science Foundation - 1993
Citation (ISO format)
ISHIHARA, Shozo et al. Studies of single-crystalline tetragonal tungsten bronze type K<sub>3</sub>Fe<sub>5</sub>F<sub>15</sub>, a potential magnetoelectric material. In: Ferroelectrics, 1994, vol. 162, n° 1-4, p. 51–62.
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Article (Published version)
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Identifiers
  • PID : unige:31210
ISSN of the journal0015-0193
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