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- W2038676013 abstract "Two structural phase transitions in (CH3NH3)2, ZnCI4 at 426 and 484 K are discovered and investigated by X-ray diffraction, calorimetric, dielectric, thermal expansion, and optical measurements. The crystals are shown to be ferroelastic below 426 K. This behaviour is explained by a symmetry change Pnma-P21/a, which is consistent with the compound structure observed at room temperature. The possible soft mode associated to the displacive part of the transition at 426 K is discussed, and a phenomenological approach following Landau theory is carried out. Es werden zwei strukturelle Phasenubergange in (CH3NH3)2ZnCI4 bei 426 und 484 K durch Röntgenstrahl-Interferenz, kalorimetrische, dielektrische und optische Messungen, sowie durch Warmeausdehnung festgestellt und untersucht. Die Kristalle sind unterhalb 426 K ferroelastisch. Dieses Verhalten erklärt sich aus einer Symmetrieänderung Pnma-P21/a, was mit der beobachteten Verbundstruktur bei Raumtemperatur übereinstimmt. Die mögliche kritische Mode des Ubergangs bei 426 K wird diskutiert und eine phänomenologische Untersuchung nach der Landau-Theorie durchgeführt." @default.
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- W2038676013 date "1981-11-16" @default.
- W2038676013 modified "2023-10-18" @default.
- W2038676013 title "Structural phase transitions in (CH3NH3), ZnCl4, crystals" @default.
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- W2038676013 doi "https://doi.org/10.1002/pssa.2210680104" @default.
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