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Thermoelastic and Piezoelastic Properties of Hexagonal RbMnCl 3
Author(s) -
Jeong S.,
Haussühl S.
Publication year - 1991
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170260613
Subject(s) - thermoelastic damping , phase transition , pyroelectricity , dielectric , derivative (finance) , ferroelectricity , condensed matter physics , thermal expansion , phase (matter) , thermodynamics , chemistry , materials science , thermal , physics , optoelectronics , organic chemistry , financial economics , economics
Temperature and pressure derivatives of the elastic constants, indices of refraction, dielectric constants, Faraday effect and thermal expansion of RbMnCl 3 near T c = 278 K confirm the existence of a second‐order phase transition. A strongly anomalous behaviour is observed with the elastic shear stiffness c 44 which possesses a positive temperature derivative and a negative pressure derivative. These properties and also the pressure derivative of the transition temperature, dT c / dp = 6.2 K kbar −1 closely resemble the anomalous behaviour of two other ferroelectric species, betaine borate and betaine hydrogen maleinate.