Acoustic dispersion near structural phase transitions

Schranz, W.; Havlik, Denis

doi:10.1080/01411599908224534

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“…The longitudinal waves were excited in the sample by LiNbO 3 transducers. The wave velocities were measured by the continuous-wave-resonance method 20 in the frequency region 8 -12 MHz. The relative accuracy in the ultrasonic measurements was about 10 Ϫ3 .…”

Section: Methodsmentioning

confidence: 99%

Frequency-dependent elastic response at the ferroelectric phase transition ofAgNa(NO2)2

et al. 2002

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The elastic dynamics of AgNa(NO 2 ) 2 crystals around the proper ferroelectric phase transition at T C ϭ38°C was investigated by ultrasonic ( f ϭ10 MHz) and dynamic mechanical analysis ͑fϭ0.6-50 Hz͒ techniques . The system represents a unique example of a ferroelectric crystal with extremely slow dielectric relaxation. Due to this reason it reveals a substantially different elastic behavior in megahertz and hertz frequency regions. We describe our data using a phenomenological model that includes both the effect of order parameter ͑polarization͒ relaxation with a characteristic time p and thermal ͑entropy͒ relaxation with a characteristic time th .

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Section: Methodsmentioning

confidence: 99%