Elastic constant measurements of super ionic LiKSO4:Na single crystals by G. Varughese, A. Santhosh Kumar, J. Philip, and G. Louis

Crystal Research and Technology

Cryst. Res. Technol. 44, 300 (2009) - Abstract -

Elastic constant measurements of super ionic LiKSO₄:Na single crystals

G. Varughese, A. Santhosh Kumar*, J. Philip**, and G. Louis***

Department of Physics, Catholicate College, Pathanamthitta, Kerala, India
*SPAP, Mahatma Gandhi University, Kottayam, Kerala, India
**STIC, Cochin University of Science &Technology, Cochin-22, India
***Department of Physics, Cochin University of Science andTechnology, Cochin-22, India

Keywords	inorganic compounds, elasticity, elastic constants, growth from solutions
PACS	61.66.Fn, 62.20.Dc, 81.10.Dn
DOI	10.1002/crat.200800475

Elastic properties of sodium doped Lithium potassium sulphate, LiK_0.9Na_0.1SO₄, crystal has been studied by ultrasonic Pulse Echo Overlap [PEO] technique and are reported for the first time. The controversy regarding the type of crystal found while growth is performed at 35 °C with equimolar fraction of Li₂SO₄H₂O, K₂SO₄ and Na₂SO₄ has been resolved by studying the elastic properties. The importance of this crystal is that it exhibits pyroelectric, ferroelectric and electro optic properties. It is simultaneously ferroelastic and superionic. The elastic properties of LiK_0.9Na_0.1SO₄ crystal are well studied by measuring ultrasonic velocity in the crystal in certain specified crystallographic directions and evaluating the elastic stiffness constants, compliance constants and Poisson’s ratios. The anisotropy in the elastic properties of the crystal are well explained by the pictorial representation of the surface plots of phase velocity, slowness and linear compressibility in a-b and a-c planes.

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