Sinha, Shantanu ; Srinivasan, R. (1984) Phase transition in ammonium aluminium and ammonium chromium alums-a high pressure EPR study Journal of Physics and Chemistry of Solids, 45 (6). pp. 665-670. ISSN 0022-3697
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002236...
Related URL: http://dx.doi.org/10.1016/0022-3697(84)90060-X
Abstract
An investigation of the phase transitions at high pressures in the alums mentioned in the title has been carried out using EPR of the Cr3+ ion (at the trivalent metal ion site). It is observed that at ambient as well as at high pressures there is a change of slope in the linear variations of the zero field splitting with temperature and that the low temperature phase is characterised by a large number of lines in the EPR spectra. The transition temperature shows a large positive shift with pressure, for both the alums. All these facts are explained in terms of our model of the origin of the trigonal field at the trivalent metal ion site as well as the details of the motion of NH4+ ion.
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ID Code: | 36783 |
Deposited On: | 11 Apr 2011 13:34 |
Last Modified: | 11 Apr 2011 13:34 |
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