[en] Temperature dependences of the dielectric constants [epsilon]i and of the birefringences [Delta]ni for light propagation directions along all the three crystallographic axes (i = a, b, c) have been measured between 5 and 350 K. The optical measurements clearly reveal a new phase transition at TL = 75 K, below which the crystal structure is transformed from the ferroelectric Pna21 phase into an unknown low temperature phase, possibly the monoclinic space group P1121. Small peaks in the dielectric constants [epsilon]a and [epsilon]b have been observed at this transition temperature.
Disciplines :
Physics
Identifiers :
UNILU:UL-ARTICLE-2009-194
Author, co-author :
Günter, P.
SANCTUARY, Roland ; University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Rohner, F.
Arend, H.
Seidenbusch, W.
Language :
English
Title :
Evidence for low temperature phase transition in Rb2ZnCl4 from dielectric constant and birefringence measurements
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