Title: Structural Study of Successive Phase Transition in [N(CH<sub>3</sub>)<sub>4</sub>]<sub>2</sub>NiCl<sub>4</sub>
Abstract: The crystal structure of [N(CH 3 ) 4 ] 2 NiCl 4 was investigated at 23°C in phase I (normal phase), at -5°C in phase III (commensurate phase) and at -60°C in phase IV (normal phase) by means of X-ray diffraction. The least-squares calculations converged at R =0.043 for phase I, at R =0.047 for phase III and at R =0.036 for phase IV, respectively. It was revealed that each tetrahedral ion is in disorder in phase I. In phase III, the position of each molecule almost coincides with one of two disordered sites in phase I. It was confirmed in phase IV that the rotating direction of each molecule about the axis parallel to the b -axis is in-phase and the rotation angle of NiCl 4 2- tetrahedron is about two times larger than that in phase I.
Publication Year: 1989
Publication Date: 1989-09-15
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 6
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