Low-temperature phase transitions and twin-domain structure of (NH 4)3H(SeO4)2 studied by the electron paramagnetic resonance of Cu2+, VO2+and SeO 3-

Ching Jiun Wu, Jiang-Tsu Yu, Mei Na Tsai, Ssu Hao Lou

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

EPR of Cu2+, VO2+, SeO3-, and other paramagnetic impurities and species were used to study the low-temperature phase transitions and twin-domain structure of (NH4) 3H(SeO4)2 crystals. The major findings are; (i) twinning in the monoclinic phases is of the merohedral type (there are three kinds of small domain related by rotations of +or-120 degrees abut the trigonal c axis), (ii) EPR of Cu2+ or SeO3- reveals the coexistence of the high-temperature and the low- temperature phases below the trigonal R3m to monoclinic A2/a phase transition and on further transitions, however, into the two other low-temperature monoclinic phases a single phase was again observed and (iii) impurities and lattice point defects created by ionizing radiations were observed to influence the twinning and crystal structure of the host compound.

Original languageEnglish
Article number012
Pages (from-to)3795-3806
Number of pages12
JournalJournal of Physics: Condensed Matter
Volume3
Issue number21
DOIs
Publication statusPublished - 1991 Dec 1

Fingerprint

Phase Transition
Electron Spin Resonance Spectroscopy
Paramagnetic resonance
electron paramagnetic resonance
Phase transitions
twinning
Temperature
Twinning
impurities
Impurities
ionizing radiation
point defects
Crystal defects
Ionizing radiation
Point defects
Ionizing Radiation
varespladib methyl
crystal structure
Crystal structure
Crystals

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Low-temperature phase transitions and twin-domain structure of (NH 4)3H(SeO4)2 studied by the electron paramagnetic resonance of Cu2+, VO2+and SeO 3-. / Wu, Ching Jiun; Yu, Jiang-Tsu; Tsai, Mei Na; Lou, Ssu Hao.

In: Journal of Physics: Condensed Matter, Vol. 3, No. 21, 012, 01.12.1991, p. 3795-3806.

Research output: Contribution to journalArticle

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abstract = "EPR of Cu2+, VO2+, SeO3-, and other paramagnetic impurities and species were used to study the low-temperature phase transitions and twin-domain structure of (NH4) 3H(SeO4)2 crystals. The major findings are; (i) twinning in the monoclinic phases is of the merohedral type (there are three kinds of small domain related by rotations of +or-120 degrees abut the trigonal c axis), (ii) EPR of Cu2+ or SeO3- reveals the coexistence of the high-temperature and the low- temperature phases below the trigonal R3m to monoclinic A2/a phase transition and on further transitions, however, into the two other low-temperature monoclinic phases a single phase was again observed and (iii) impurities and lattice point defects created by ionizing radiations were observed to influence the twinning and crystal structure of the host compound.",
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AB - EPR of Cu2+, VO2+, SeO3-, and other paramagnetic impurities and species were used to study the low-temperature phase transitions and twin-domain structure of (NH4) 3H(SeO4)2 crystals. The major findings are; (i) twinning in the monoclinic phases is of the merohedral type (there are three kinds of small domain related by rotations of +or-120 degrees abut the trigonal c axis), (ii) EPR of Cu2+ or SeO3- reveals the coexistence of the high-temperature and the low- temperature phases below the trigonal R3m to monoclinic A2/a phase transition and on further transitions, however, into the two other low-temperature monoclinic phases a single phase was again observed and (iii) impurities and lattice point defects created by ionizing radiations were observed to influence the twinning and crystal structure of the host compound.

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