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Anisotropy in elastic properties of lithium sodium sulphate hexahydrate single crystal—An ultrasonic study

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Abstract

The double sulfate family of (ABSO4) where A and B are alkali metal cations, is the object of great interest owing to the complexity and richness of its sequence of phase transition induced by temperature variation. A new sulfate salt characterized by the presence of water molecule in the unit cell with the chemical formula, Li2Na3(SO4)2·6H2O (LSSW), was obtained. The ultrasonic velocity measurement was done with pulse echo overlap technique [PEO]. All the six second order elastic stiffness constants, C 11  =  C 22, C 33, C 44  =  C 55, C 12, C 14 and C 13  =  C 23, are reported for the first time. The anisotropy in the elastic properties of the crystal are well explained by the pictorial representation of the surface plots of phase velocity, slowness, Young’s modulus and linear compressibility in a–b and a–c planes.

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Acknowledgements

One of the authors (GV) thanks UGC, Delhi, for a Teacher Fellowship.

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Authors and Affiliations

  1. Department of Physics, Catholicate College, Pathanamthitta, 689 648, India

    GEORGE VARUGHESE

  2. SPAP, M.G. University, Kottayam, 686 560, India

    A S KUMAR

  3. STIC, Cochin University of Science and Technology, Kochi, 682 022, India

    J PHILIP

  4. Department of Physics, Cochin University of Science and Technology, Kochi, 682 022, India

    GEORGE LOUIS

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  1. GEORGE VARUGHESE
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  2. A S KUMAR
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  3. J PHILIP
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  4. GEORGE LOUIS
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Correspondence to GEORGE VARUGHESE.

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VARUGHESE, G., KUMAR, A.S., PHILIP, J. et al. Anisotropy in elastic properties of lithium sodium sulphate hexahydrate single crystal—An ultrasonic study. Bull Mater Sci 36, 143–148 (2013). https://doi.org/10.1007/s12034-013-0421-z

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  • DOI: https://doi.org/10.1007/s12034-013-0421-z

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