Unusual sequence of commensurate-incommensurate phase transitions observed in KLiSO4 |
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| Authors: | C.H.A. Fonseca G.M. Ribeiro R. Gazzinelli A.S. Chaves |
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| Affiliation: | Departamento de Física - ICEx Universidade Federal de Minas Gerais CP 702 Belo Horizonte Brasil |
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| Abstract: | An unusual structural phase transition sequence is observed in KLiSO4 by EPR: high temperature prototype phase -incommensurately modulated phase - commensurately modulated phase - incommensurately modulated phase - low temperature prototype phase (reentrant phase). The low temperature phase has the same symmetry C66 of the high temperature prototype phase. The main feature of the modulation are rotations of the sulphate tetrahedra, which were precisely determined in the commensurately modulated phase. |
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