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

doi:10.1016/0038-1098(94)90753-6

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

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

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 language	English
Pages (from-to)	543-547
Number of pages	5
Journal	Solid State Communications
Volume	89
Issue number	6
DOIs	https://doi.org/10.1016/0038-1098(94)90753-6
Publication status	Published - 1994 Feb

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Materials Chemistry

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@article{80bd2043bc05461086db8b75a422eb56,

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

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.",

author = "Yu, \{Jiang Tsu\} and Liu, \{Kuo Tung\} and Jeng, \{Yng Huey\}",

note = "Funding Information: Acknowledgement - The authors gratefully acknowledge the support given by the National Science Council of the Republic of China during the period of this work.",

year = "1994",

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doi = "10.1016/0038-1098(94)90753-6",

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T1 - Structural phase transitions in [(CH3)4N]CdCl3 studied by the EPR of the [N(CH3)3]+ radicals

AU - Yu, Jiang Tsu

AU - Liu, Kuo Tung

AU - Jeng, Yng Huey

N1 - Funding Information: Acknowledgement - The authors gratefully acknowledge the support given by the National Science Council of the Republic of China during the period of this work.

PY - 1994/2

Y1 - 1994/2

N2 - 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.

AB - 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.

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DO - 10.1016/0038-1098(94)90753-6

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AN - SCOPUS:0037555757

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JF - Solid State Communications

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

Abstract

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