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Raman Investigation of the Low Temperature Phase Transitions in Monoclinic TlReO 4
Author(s) -
de Waal Danita,
Kiefer Wolfgang
Publication year - 2004
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200300270
Subject(s) - monoclinic crystal system , orthorhombic crystal system , tetragonal crystal system , raman spectroscopy , phase (matter) , materials science , crystallography , phase transition , chemistry , crystal structure , condensed matter physics , optics , physics , organic chemistry
The Raman spectrum of monoclinic TlReO 4 is presented together with a factor group analysis and assignment of the bands. The phase transitions of monoclinic TlReO 4 is investigated below room temperature, and two phase transitions were identified between room temperature and 90 K. The room temperature monoclinic phase was converted to the orthorhombic phase at 170 K upon cooling, and to the tetragonal phase at 150 K. Upon heating back to room temperature the tetragonal phase persisted until the orthorhombic phase could be identified at 210 K and 220 K. From 230 K to room temperature the monoclinic phase could again be observed.