Motions of Methylammonium Ions in (CH3NH3)2ZnBr4 Crystals Studied by 1H NMR and Thermal Measurements

Hiroyuki Ishida, Kentaro Takagi, Tadashi Iwachido, Mifune Terashima, Daiyu Nakamura, Ryuichi Ikeda

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Measurements of the 1H spin-lattice relaxation time T1, the linewidth parameter [FORMULA OMITTED], the second moment of 1H NMR absorption, differential thermal analysis, and differential scanning calorimetry were performed on methylammonium tetrabromozincate(II) crystals from 58 to above 500 K. A solid-solid phase transition was located at 456 K. In the room temperature phase, 120° reorientational jumps of CH3 and [FORMULA OMITTED] groups in the cation about its C — N bond axis were detected. In the high-temperature phase, the cations undergo overall reorientation as well as translational self-diffusion. The activation energy for the cationic self-diffusion was evaluated to be 18 kJ mol−1.

Original languageEnglish
Pages (from-to)923-927
Number of pages5
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Volume45
Issue number7
DOIs
Publication statusPublished - Jul 1 1990

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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