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Raman spectra and phase transitions in single crystal (NH4)2ZnCl4

✍ Scribed by Anshu Agarwal; M.B. Patel; Mahendra Pal; H.D. Bist

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
650 KB
Volume
40
Category
Article
ISSN
1386-1425

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✦ Synopsis

Raman spectra of single crystal (NH.&ZnCI, at 300 and 105 K at different polarizations are reported and analysed in view of previously reported structural data. The experimental observations suggest that the free oriented gas model is applicable for group theoretical analysis of the vibrational modes in this system at room temperature. It is also concluded that the space group for the room temperature phase III is C,' instead of CzO. The temperature dependence of thermosensitive bands shows discontinuities at 267 and 194K. The structure in the new phase VI below 194 K is suggested to be triclinic.

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