Complete Elastic Constants Of Alpha-Bab2o4: Schaefer-Bergmann Acousto-Optic Diffraction And Resonant Ultrasound Spectroscopy

Both Schaefer-Bergmann diffraction and resonant ultrasound spectroscopy were used to measure the six independent elastic-stiffness coefficients of the trigonal, non-piezoelectric crystal alpha-BaB2O4. The two measurement sets resulted in a root-mean-square variance of 1.2%. This paper provides a detailed analysis of the two different measurement techniques and discusses the similarities and differences. (C) 2016 Acoustical Society of America.