Correction for transducer influence on sound velocity measurements by the pulse echo method

Kittinger, Erwin

doi:10.1016/0041-624x(77)90010-5

Cited by 63 publications

(15 citation statements)

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“…Velocity data were corrected for transducer diffraction effects by using methods developed by Kittinger. 10 The sensitivity of the measuring technique was 1 part in 10 5 and the error in the absolute values of the sound velocity is about 0.5%. Hydrostatic pressure in the range of 0-0.16 GPa was generated by a high-pressure gas system using nitrogen gas as the pressure medium.…”

Section: Experimental Methodsmentioning

confidence: 97%

BOB Acoustic-mode vibrational anharmonicity in Cr-Si alloy single crystals

Prinsloo¹,

Alberts²,

Smit³

1997

Phys. Rev. B

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Measurements are reported of the hydrostatic-pressure dependences of the elastic constants of Crϩ0.5 at. % Si and Crϩ1.6 at. % Si alloy single crystals through the Néel transition. In the former crystal the Néel transition is a second-order incommensurate ͑I͒ spin-density-wave ͑SDW͒-to-paramagnetic ͑P͒ transition, while it is a first-order commensurate ͑C͒ SDW-to-P transition in the latter crystal. The pressure derivatives of the elastic constants at different constant temperatures are used to calculate the acoustic-mode Grüneisen parameters, which quantify the vibrational anharmonicity, as a function of temperature through the Néel transition of each crystal. For the Crϩ0.5 at. % Si crystal the mean long-wavelength acoustic mode Grüneisen parameter, ␥ el ϷϪ5, jumps by ⌬␥ el ϭ30, from ␥ el ϷϪ5 to ␥ el ϭϩ25, in going through the second-order ISDW-P Néel transition, and then decreases to a value of ␥ el Ϸϩ5 at temperatures well into the paramagnetic phase. This jump is much larger, ⌬␥ el ϭ170, from ␥ el ϭϪ50 to ␥ el ϭϩ150, in going through the first-order CSDW-P Néel transition of Crϩ1.6 at. % Si, after which ␥ el decreases to ␥ el Ϸ0 at temperatures deep into the paramagnetic phase. The results show very strong coupling of the SDW to the long-wavelength longitudinalacoustic phonons in both crystals. Coupling to the long-wavelength shear acoustic phonons is relatively weak. In both crystals there is also strong coupling of the longitudinal phonons with the spin fluctuations above T N . The present measurements are compared with anharmonic effects observed through the second-order CSDW-P Néel transitions of Crϩ0.3 at. % Ru and Crϩ3.5 at. % Al alloy single crystals.

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Section: Experimental Methodsmentioning

confidence: 97%

BOB Acoustic-mode vibrational anharmonicity in Cr-Si alloy single crystals

Prinsloo¹,

Alberts²,

Smit³

1997

Phys. Rev. B

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“…To measure the effect of hydrostatic pressure on ultrasonic wave transit time, a pulse-echo overlap system, capable of detecting changes in the ultrasound transit time in these ceramic specimens to 1 part in lo5, was used. A transducer correction (Kittinger 1977) was applied throughout to the measured transit time and hence to ultrasonic wave velocities.…”

Section: Methodsmentioning

confidence: 99%

Elastic behaviour under pressure of high-T _c superconductors RBa₂Cu₃O_7-x (R = Y, Gd and Eu)

Al-Kheffaji

Cankurtaran

Saunders

et al. 1989

Philosophical Magazine B

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“…The TGS crystals were orientated by first identifying the two-fold axis using the X-ray back-reflection Laue technique, then finding the a-and c-axes by reference to the crystal morphology [4]. Four cubes were cut with a diamond A correction has been applied to the ultrasonic velocity, to account for the transducer effect which, depending upon the acoustic impedance mismatch between TGS and quartz, acts to alter the effective path length [8]. Velocities were measured for the ultrasonic modes listed in Table I, sufficient to enable determination of a complete set of elastic constants [ 1 ].…”

Section: Determination Of the Elastic Constants Of Tgsmentioning

confidence: 99%

The elastic stiffness constants and their hydrostatic pressure derivatives for TGS

Dunk

Saunders

1984

J Mater Sci

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The thirteen adiabatic elastic stiffness moduli of triglycine sulphate (TGS) have been determined at room temperature from measurements of the ultrasound wave velocities. Results are used to describe the elastic behaviour of TGS. Accidental pure mode directions have been found at 9.4 ~ and 106.5 ~ A method has been developed for obtaining the hydrostatic pressure derivatives (aClj/~P) of the elastic constants of a monoclinic crystal from the hydrostatic pressure dependences of ultrasound wave velocities. This method has been applied to find the ~CIj/~P for TGS. There is no evidence for acoustic phonon mode softening under pressure.

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Correction for transducer influence on sound velocity measurements by the pulse echo method

Cited by 63 publications

References 1 publication

BOB Acoustic-mode vibrational anharmonicity in Cr-Si alloy single crystals

BOB Acoustic-mode vibrational anharmonicity in Cr-Si alloy single crystals

Elastic behaviour under pressure of high-T _c superconductors RBa₂Cu₃O_7-x (R = Y, Gd and Eu)

The elastic stiffness constants and their hydrostatic pressure derivatives for TGS

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Correction for transducer influence on sound velocity measurements by the pulse echo method

Cited by 63 publications

References 1 publication

BOB Acoustic-mode vibrational anharmonicity in Cr-Si alloy single crystals

BOB Acoustic-mode vibrational anharmonicity in Cr-Si alloy single crystals

Elastic behaviour under pressure of high-T c superconductors RBa2Cu3O7-x (R = Y, Gd and Eu)

The elastic stiffness constants and their hydrostatic pressure derivatives for TGS

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Elastic behaviour under pressure of high-T _c superconductors RBa₂Cu₃O_7-x (R = Y, Gd and Eu)