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

研究成果: 雜誌貢獻文章

8 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
文章編號012
頁(從 - 到)3795-3806
頁數12
期刊Journal of Physics: Condensed Matter
3
發行號21
DOIs
出版狀態已發佈 - 1991 十二月 1

    指紋

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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