Phase transitions and thermal expansion in langbeinite type compounds

We report thermal expansion measurements using capacitance dilatometric methods on several polar and non-polar compounds of the langbeinite family, from liquid helium to room temperature. In K 2Mn 2(SO 4) 3 and Tl 2Cd 2(SO 4) 3 new thermal expansion anomalies indicative of phase transitions were det...

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Bibliographic Details
Published in:Solid state communications 1988-04, Vol.66 (4), p.375-378
Main Authors: Kahrizi, Mojtaba, Steinitz, M.O.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Physics
Specific phase transitions
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Summary:We report thermal expansion measurements using capacitance dilatometric methods on several polar and non-polar compounds of the langbeinite family, from liquid helium to room temperature. In K 2Mn 2(SO 4) 3 and Tl 2Cd 2(SO 4) 3 new thermal expansion anomalies indicative of phase transitions were detected. Similarly, two phase transitions were detected for the first time at 227.8 K and 330.8 K respectively in Tl 2Mg 2(SO 4) 3. In (NH 4) 2Mg 2(SO 4) 3 two phase transitions were discovered at 220 K and 241 K with decreasing temperature, although with increasing temperature only one phase transition could be detected.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(88)90860-5