Elastic Anomalies in LiK_0.9Na_0.1 SO₄ Single Crystal

Abstract

Phase transition studies of sodium doped Lithium potassium sulphate, Li K _0.9 Na _0.1 SO ₄ , crystal by ultrasonic Pulse Echo Overlap [PEO] technique are reported for the first time. The crystal shows pyroelectric, ferroelectric and electro optic properties. It is simultaneously ferroelastic and superionic. This study reported elastic properties and checked the effect of doping on suspected phase transition around 333 K as reported by Brillouin and thermal expansion studies. The transverse modes C ₄₄ and C ₆₆ show elastic anomalies around 333 K.

Keywords:

• A. Inorganic compounds
• B. Crystal growth
• C. Ultrasonic measurements
• D. Elastic properties

Acknowledgment

One of the authors (GV) thanks University Grants Commission, Delhi for a Teacher Fellowship.