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Raman spectroscopic study of structural phase transitions in the layer crystals (EtNH3)2MCl4 with M=Cd and Mn

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Published in Journal of Physics. C, Solid State Physics. 1985, vol. 18, no. 35, p. 6441-6456
Abstract The authors have studied the Raman spectra of the crystals (EtNH3)2MCl4 (M=Cd and Mn) as functions of temperature from 5 to 300K. The external vibrations have been assigned. The space group of the Cd crystal below 114K is found to be P22/b and the phase transition P21/b-Pbca is described as a displacive first-order transition. The order-disorder transitions Pbca-Abma in (EtNH3)2MCl4 for M=Cd and M=Mn are compared. Linewidth measurements performed on the carbon-carbon stretching mode at about 870 cm-1 suggest the possibility of a second-order transition in the Mn crystal, while the first-order behaviour of the transition in the Cd crystal is confirmed.
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Research group Groupe Bill
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HAGEMANN, Hans-Rudolf, BILL, Hans. Raman spectroscopic study of structural phase transitions in the layer crystals (EtNH3)2MCl4 with M=Cd and Mn. In: Journal of Physics. C, Solid State Physics, 1985, vol. 18, n° 35, p. 6441-6456. https://archive-ouverte.unige.ch/unige:3104

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Deposited on : 2009-09-21

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