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Raman spectroscopic study of (CH3NH3)2HgCl4 in the high-temperature range

โœ Scribed by P.S.R. Prasad; S. Sathaiah; H.D. Bist

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
295 KB
Volume
142
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

A Raman spectroscopic study of (CH3NH,)2HgC14 is reported in the temperature range 299-373 K. Discontinuities in the Hg-Cl symmetric stretching mode and in the frequency shift of the C-N stretching mode indicate a new phase above 330 K. A non-hnear increment of the widths of these bands confirms the transition. Arrhenius behaviour of the C-N stretching mode indicates a barrier of 1234 cm-'.

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Recewed 6 bhry 198 1; in final form 4 June 1981 (CHaNHa)a [SnCle] undergoes a cr~hcal phase transrtion at 154.32 f 0.06 R with the critical exponents CL = 0.36 +\_ 0.04, $ = 0.19 i\_ 0.02, the critical entropy ratio 0 062 and the total transition entropy (1.60 + 0.18) R. Infrared spectral change fav