Elastic stiffness constants and acoustic symmetry of LiY0.5Tb0.5F4
1980; Elsevier BV; Volume: 41; Issue: 10 Linguagem: Inglês
10.1016/0022-3697(80)90060-8
ISSN1879-2553
AutoresP. Blanchfield, G. A. Saunders,
Tópico(s)Photorefractive and Nonlinear Optics
ResumoAbstract Measurements of ultrasound wave velocities between 4.2 and 293 K have been used to determine the temperature dependences of the seven adiabatic elastic stiffness tensor components of the laser host scheelite structure fluoride LiY0.5Tb0.5F4. The sign of C16 is negative, as found previously for other oxide and fluoride scheelites; therefore for LiY0.5Tb0.5F4 the positions of the acoustic symmetry axes in the XY plane have the same sense as those of the other scheelites. The k and γ axes of acoustic symmetry lie at +31° and + 76° from the + X axis. Transformation of the elastic stiffness constants to a basis comprised of two acoustic symmetry axes together with the +Z axis enables a detailed comparison of the elastic behaviour of LiY0.5Tb0.5F4 with those of other scheelite crystals.
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