The temperature dependence of the pressure switching of Jahn–Teller deformation in the deuterated ammonium copper Tutton salt

The pressure switch of the Jahn–Teller deformation direction in (ND 4) 2Cu(SO 4) 2·6D 2O was investigated in the temperature range 130–320 K. Below 295 K, the new, pressure-induced phase, is stable under ambient pressure. Switching back is observed on heating to above 297 K. In the range 150–295 K a...

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Published in:Chemical physics letters 1999-09, Vol.311 (3), p.126-130
Main Authors: Augustyniak, Maria A, Krupski, Marcin
Format: Article
Language:English
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Summary:The pressure switch of the Jahn–Teller deformation direction in (ND 4) 2Cu(SO 4) 2·6D 2O was investigated in the temperature range 130–320 K. Below 295 K, the new, pressure-induced phase, is stable under ambient pressure. Switching back is observed on heating to above 297 K. In the range 150–295 K a strong temperature dependence of the switching pressure (from 24 to 450 MPa) is observed. Below 150 K, the switching process is slow and a coexistence of two phases is observed. We conclude that the switch of the Cu(D 2O) 6 complex deformation direction is the Jahn–Teller response to the changes in the hydrogen bond system.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(99)00806-4