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Birefringence of low-temperature phases of ferroelastic bis(n-propylammonium) tetrachlorocadmate

Kusto, W. J.
Published in Ferroelectrics. 1992, vol. 125, no. 1-4, p. 191-196
Abstract Polarized light observations accompanied by precise birefringence measurements (within the (001) plane) of bis(n-propylammonium) tetrachlorocadmate, (n-C3H7NH3)2CdCl4, were performed at 8-300 K. Existence of 1st order phase transitions (at 105(1) K and 157(1) K) and of a 2nd order incommensurate phase transition (at 180 K) were clearly confirmed. All 4 low-temp. phases are ferroelastic. Clear manifestation of the spontaneous shear angle was noticed; its large room-temp. value detd. optically agrees with x-ray diffraction results. Good correlation of birefringence behavior with adiabatic calorimetry and Raman scattering results was found.
Keywords FerroelasticityBirefringence
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KUSTO, W. J., RIVERA, Jean-Pierre, SCHMID, Hans. Birefringence of low-temperature phases of ferroelastic bis(n-propylammonium) tetrachlorocadmate. In: Ferroelectrics, 1992, vol. 125, n° 1-4, p. 191-196. https://archive-ouverte.unige.ch/unige:31431

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Deposited on : 2013-11-27

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