Japanese Journal of Applied Physics · 1980 · 21 citations · 8 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsSolid State PhysicsThermodynamicsPhase EquilibriaPhase TransitionsUltrasonicsUltrasound PhysicsIncommensurate TransitionsPhase Transition TemperatureTemperature DependenceTemperature Effects On Phase BehaviorTemperature-dependent Phase TransitionsTemperature-induced Phase TransitionsThermal Analysis Of Phase TransitionsUltrasonic Testing
Ultrasonic velocities of K 2 SeO 4 were measured in the temperature range of the incommensurate phase transition. At the transition temperature T I , c 33 shows a larger jump than c 11 and c 22 , and below T I , c 44 shows a larger variation than c 55 and c 66 . The critical index β obtained from the temperature dependence of the increment of c 44 below T I was found to be 0.34±0.03.
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