Ferroelectrics · 1978 · 22 citations · 7 references
Natural SciencesMaterials SciencePhysicsAcousticsCeramic MaterialsUltrasoundAcoustic MaterialsAcoustic Wave PropagationPhysical AcousticsUltrasonicsUltrasound PhysicsLongitudinal WavesOrder-disorder Phase DiagramOrder-disorder Phase TransitionOrthorhombic SystemStiffnessTemperature DependenceUltrasonic AttenuationUltrasonic Waves
Abstract In the present paper we report experimental results of the velocity and attenuation of ultrasonic longitudinal waves in TSCC ((CH3NHCH3COOH)3- CaCl2), which is an uniaxial ferroelectric below 127 K with a phase transition of the second order of order-disorder type.1–3 In the paraelectric phase (D2k = mmm) and in the ferroelectric phase (C22k = mm2) TSCC belongs to the orthorhombic system? An anomalous increase of the attenuation in y-direction of sound waves and a step-like behaviour of the sound velocities v 22 and v 11 were observed.
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