Homogeneity Evaluation of LiNbO 3 and LiTaO 3 Single Crystals for Determining Acoustical Physical Constants

The homogeneity of surface acoustic wave (SAW) grade LiNbO 3 and LiTaO 3 single crystals, which are used to accurately measure acoustical physical constants, is evaluated using several specimens, by measuring the leaky surface acoustic wave (LSAW) velocity, longitudinal velocity, density, lattice co...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1999-05, Vol.38 (5S), p.3201
Main Authors: Izumi Takanaga, Izumi Takanaga, Junji Hirohashi, Junji Hirohashi, Jun-ichi Kushibiki, Jun-ichi Kushibiki
Format: Article
Language:English
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Summary:The homogeneity of surface acoustic wave (SAW) grade LiNbO 3 and LiTaO 3 single crystals, which are used to accurately measure acoustical physical constants, is evaluated using several specimens, by measuring the leaky surface acoustic wave (LSAW) velocity, longitudinal velocity, density, lattice constant, and Curie temperature. The specimens are taken perpendicular to the pulling-axis direction of each crystal. The variations of LSAW and longitudinal velocities along the pulling-axis direction are at most 1 m/s, and the corresponding changes of chemical composition ratio are estimated to be about 0.02 Li 2 O-mol% for both LiNbO 3 and LiTaO 3 crystals. The evaluation proves that the crystals employed can be regarded as homogeneous within the measurement accuracy, when the effect of the variations in the crystals on the constant determination is investigated.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.38.3201