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- W2031307975 abstract "Structural phase transitions have been studied in the perovskite-type layer compounds (C6H13NH3)2PbCl4 and (C9H19NH3)2PbCl4 using differential scanning calorimetry, X-ray diffraction and spectroscopic techniques. The results show that these structural phase transitions are related to the dynamics of the alkylammonium ions and to deformation of PbCl6 octahedra. The phases stable at low temperature are ordered and the alkylammonium chains are in extended configuration with a gauche bond in the proximity of the NH3 group. The minor transition in these compounds corresponds to the formation of gauche forms (G) in the vicinity of the methyl group. The major transition in these two lead compounds has been attributed to chain melting. The two structural phase transitions in the perovskite layer structure compound (C9H19NH3)2CdCl4 have been studied by DSC and infrared spectroscopic techniques. The main transition corresponds to the onset of chain melting at the same time as the dynamic twofold rotational disordering of the chains. The minor transition corresponds to a further melting of the chains. From the study of (C6H13NH3)2PbCl4, (C9H19NH3)2PbCl4 and (C9H19NH3)2CdCl4, it is suggested that the number of phase transitions and their nature depend on the length of the alkylammonium chains and on the nature of the metal atom." @default.
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- W2031307975 date "1997-08-01" @default.
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- W2031307975 title "Comparative Studies of Phase Transitions of Alkyl Chains in (C6H13NH3)2PbCl4, (C9H19NH3)2PbCl4 and (C9H19NH3)2CdCl4" @default.
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- W2031307975 doi "https://doi.org/10.1002/1521-396x(199708)162:2<575::aid-pssa575>3.0.co;2-6" @default.
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