No. 20002 Deposited with http://cryst.instr.yamaguchi-u.ac.jp/20002/
Journal: Journal of the Physical Society of Japan Vol.69 No.11 pp.3581-3588
Title: Crystal Structures of {P(CH3)4}2CuCl4 in Phases I, II and III
Authors: Yasuo NISHIJIMA* and Hiroyuki MASHIYAMA+
Affiliation: Department of Physics, Faculty of Science, Yamaguchi University, Yamaguchi 753-8512
* Present address: Yamaguchi Pref. Fisheries High School, Senzaki 1002, Nagato, Yamaguchi 759-4106.
(Received July 10, 2000)
Abstract:
The crystal structures of {P(CH3)4}2CuCl4 in phase I, II and III are determined by single crystal X-ray diffractometry.
The phase I is isomorphous to the normal phase of {N(CH3)4}2ZnCl4-type crystal, though the CuCl4 tetrahedron is fairly distorted from the regular tetrahedral shape.
The incommensurate phase II is refined by the use of the 4-dimensional superspace group.
The second harmonics of the modulation is comparably strong as the primary modulation at 360K.
The incommensurate structure is compared with the room temperature phase III, where the cell dimension along the c axis is tripled.
The structural transition sequence is discussed in connection to the size of tetrahedral monovalent cation.
Keywords: phase transition, incommensurate crystal, structure analysis, {P(CH3)4}2CuCl4
DEPOSITED DATA
Top page