Structural phase transitions in [(CH3)4N]CdCl3 studied by the EPR of the [N(CH3)3]+ radicals

Jiang Tsu Yu, Kuo Tung Liu, Yng Huey Jeng

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Abstract

The hexagonal P63 m to monoclinic P21 m structural phase transition in [(CH3)4N]CdCl3 has been investigated by the electron paramagnetic resonance (EPR) of the [N(CH3)3]+ radicals produced by γ-irradiation. Above the transition temperature, this radical species exhibits axial symmetry, with the hexagonal c-axis as the symmetry axis. Below the phase transition, the magnetic symmetry departs significantly from axial symmetry. The apparent EPR proper rotation group in the monoclinic phase is the hexagonal C6, the same as in the hexagonal phase. This indicates the presence of merohedral twinning below the phase transition. The hexagonal c-axis becomes the unique twofold axis of the monoclinic phase, and there exist three types of twin-domains related by rotations of ±120° (or ±60°) about the c-axis.

Original languageEnglish
Pages (from-to)543-547
Number of pages5
JournalSolid State Communications
Volume89
Issue number6
DOIs
Publication statusPublished - 1994 Feb

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ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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