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Generalized Gruneisen parameters of elastic waves in lithium niobate and its low-temperature thermal expansion

Generalized Gruneisen parameters of elastic waves in lithium niobate and its low-temperature... The generalized Gruneisen parameters of elastic waves propagating in different directions in lithium niobate are calculated from the measured second- and third-order elastic constants. There are a large number of longitudinal acoustic gammas that are negative. Some of the transverse elastic gammas are also negative, in particular when the crystal is strained parallel to the trigonal axis. The Brugger gammas are evaluated and the low-temperature limit of the Gruneisen gamma is calculated using the procedure of Ramji Rao and Srinivasan. ovγ L has the value 0.65 for lithium niobate. ovγ∥ Br(0) has a low value of 0.03, indicating a small thermal expansion coefficient parallel to the trigonal axis, which is corroborated by the thermal expansion measurements of Zhdanova et al. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Low Temperature Physics Springer Journals

Generalized Gruneisen parameters of elastic waves in lithium niobate and its low-temperature thermal expansion

Ramji Rao, R.; Menon, C.
Journal of Low Temperature Physics , Volume 20 (6) – May 19, 2004
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References (7)

Publisher
Springer Journals
Copyright
Copyright
Subject
Physics; Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials
ISSN
0022-2291
eISSN
1573-7357
DOI
10.1007/BF00120868
Publisher site
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Abstract

The generalized Gruneisen parameters of elastic waves propagating in different directions in lithium niobate are calculated from the measured second- and third-order elastic constants. There are a large number of longitudinal acoustic gammas that are negative. Some of the transverse elastic gammas are also negative, in particular when the crystal is strained parallel to the trigonal axis. The Brugger gammas are evaluated and the low-temperature limit of the Gruneisen gamma is calculated using the procedure of Ramji Rao and Srinivasan. ovγ L has the value 0.65 for lithium niobate. ovγ∥ Br(0) has a low value of 0.03, indicating a small thermal expansion coefficient parallel to the trigonal axis, which is corroborated by the thermal expansion measurements of Zhdanova et al.

Journal

Journal of Low Temperature Physics – Springer Journals

Published: May 19, 2004

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