Low-temperature structural phase transition in deuterated and protonated lithium acetate dihydrate |
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| Authors: | F. Schröder B. Winkler E. Haussühl P.T. Cong B. Wolf M. Avalos-Borja M. Quilichini B. Hennion |
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| Affiliation: | 1. Goethe-Universität Frankfurt am Main, Institut für Geowissenschaften, Abt. Kristallographie, Altenhöferallee 1, 60438 Frankfurt am Main, Germany;2. Goethe-Universität Frankfurt am Main, Physikalisches Institut, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany;3. Instituto Potosino de Investigación Cientifica y Tecnológica, A.C. Camino a la Presa San José 2055, Col. Lomas 4 sección CP 78216, San Luis Potosi, Mexico;4. Laboratoire Leon Brillouin, CEN Saclay, 91191 Gif-sur-Yvette, France |
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| Abstract: | Heat capacity measurements of protonated lithium acetate dihydrate show a structural phase transition at T = 12 K. This finding is in contrast to earlier work, where it was thought that only the deuterated compound undergoes a low temperature structural phase transition. This finding is confirmed by low temperature ultrasound spectroscopy, where the structural phase transition is associated with a velocity decrease of the ultrasonic waves, i.e. with an elastic softening. We compare the thermodynamic properties of the protonated and deuterated compounds and discuss two alternatives for the mechanism of the phase transition based on the thermal expansion measurements. |
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