Studies of phase transitions and ferroelastic domain walls in Pb5Al3F19 crystals by optical measurements |
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Authors: | S. Sarraute J. Ravez |
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Affiliation: | Institut de Chimie de la Matière Condensée de Bordeaux , CNRS Av. Dr. Schweitzer, 33608, Pessac, France |
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Abstract: | Three phase transitions between 100 and 400 K were previously shown by X-ray diffraction measurements. Such results have been confirmed by optical measurements on crystals. The thermal dependence of the birefringence has been determined. A new phase transformation has been shown at around 590 K not only by optical study but also by dielectric measurements. Ferroelastic domain-walls have been visualized. The sequence transition has been discussed taking into account the various space groups. |
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Keywords: | Phase transition (C4H9NH3)2SnCl6 infrared analysis raman analysis. |
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