Critical ultrasonic behavior near phase transitions in BCCD crystals

Samulionis, V.; Valevicius, V.; Banys, J.; Kamba, S.

doi:10.1080/00150199608224109

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…The measurements of the ultrasonic velocity were performed using a computer controlled pulse echo equipment [11]. The precision of relative velocity measurements was better than 10 À4 .…”

Section: Methodsmentioning

confidence: 99%

The Critical Behaviour of Ultrasonic Velocity at a Second-Order Phase Transition in Sn2P2S6 Single Crystals

Samulionis

Banys

Vysochanskii

et al. 1999

phys. stat. sol. (b)

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Precise measurements of the ultrasonic velocity have been performed in Sn2P2S6 single crystals in the temperature interval 290 to 420 K. It was shown that in the paraelectric phase above Tc ≈︂ 337 K the anomalous part of the ultrasonic velocity changes with critical exponent α = 0.5 with small multiplicative logarithmic correction, which is in agreement with renormalization group theory calculations of Folk et al. [1] for proper uniaxial ferroelectrics near the tricritical Lifshitz point on the phase diagram. In the ferroelectric phase the Landau‐Khalatnikov theory is a good approximation to describe the critical ultrasonic velocity behaviour in Sn2P2S6.

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“…The measurements of the ultrasonic velocity were performed using a computer controlled pulse echo equipment [11]. The precision of relative velocity measurements was better than 10 À4 .…”

Section: Methodsmentioning

confidence: 99%

The Critical Behaviour of Ultrasonic Velocity at a Second-Order Phase Transition in Sn2P2S6 Single Crystals

Samulionis

Banys

Vysochanskii

et al. 1999

phys. stat. sol. (b)

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“…Such behaviour of the on-diagonal components of the elasticity tensor is extremely rare. In the ferroelectric phase of the (NH 4 ) 2 ZnCl 4 crystal this coefficient for the c 66 component is +1.6 × 10 −4 K −1 [25], and in the betaine calcium chloride dehydrate, for c 33 component this coefficient is +0.4 × 10 −4 K −1 [26].…”

Section: Methodsmentioning

confidence: 99%

Temperature dependences of piezoelectric, elastic and dielectric constants of L-alanine crystal

Tylczyñski¹,

Sterczyńska²,

Wiesner³

2011

J. Phys.: Condens. Matter

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Temperature changes in the components of piezoelectric, elastic and dielectric tensors were studied in L-alanine crystals in the range 100-300 K. A jumpwise increase in the c(55) component of the elastic stiffness accompanied by maxima in damping of all face-shear modes observed at 199 K in L-alanine crystal were interpreted as a result of changes in the NH(3)(+) vibrations occurring through electron-phonon coupling. All components of the piezoelectric tensor show small anomalies in this temperature range. The components of the electromechanical coupling coefficient determined indicate that L-alanine is a weak piezoelectric.

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