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.
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