Crystal Structure of Trimethylammonium Perchlorate in Three Solid Phases Including the Ionic Plastic Phase Obtainable above 480 K

Hiroyuki Ishida, Yoshihiro Kubozono, Setsuo Kashino, Ryuichi Ikeda

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The crystal structures of (CH3)3NHC1O4 in three solid phases were studied by X-ray diffraction techniques. X-ray powder patterns taken at ca. 500 and 445 K revealed that the plastic phase (Phase I) attainable above 480 K crystallizes in a CsCl-type cubic structure with a = 5.845 (1) A, Z = 1, V = 199.7 (2) A3, and Dx= 1.327 gcm−3, while Phase II, stable between 480 and 396 K, forms a tetragonal structure with a = 9.912 (4), c = 7.01 (2) A, Z = 4, V = 689 (3) A3, and Dx = 1.54 gcm−3. The room temperature phase (Phase III) was studied by single crystal X-ray diffraction and found to form a monoclinic lattice with space group P21a = 5.749(1), b = 8.670(1), c = 7.5585 (9) A, β = 102.66(1)°, Z = 2, V = 367.6(2) A3, and Dx= 1.441 gcm−3. Thermal measurements, differential thermal analysis and differential scanning calorimetry, were carried out on these solid phases, and the obtained results were compared with those observed for (CH3)3NHBF4.

Original languageEnglish
Pages (from-to)723-726
Number of pages4
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Volume49
Issue number6
DOIs
Publication statusPublished - Jun 1 1994

Keywords

  • Crystal structure
  • Ionic plastic phase
  • Thermal measurements
  • X-ray diffraction

ASJC Scopus subject areas

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

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