The results of investigations the elastic and photoelastic properties of a number of garnets crystals obtained by Mandelshtam‐Brillouin technique including the data of ultrasonic experiments are represented. The velocity of sound propagation, the character of elastic interaction between ions in the lattice, nature of photon–phonon interaction in garnets is revealed. The mechanical, thermal and acoustooptical properties of garnets are rated using measured elastic and photoelastic data. The obtained results allow to predict a number of important characteristics of crystals with garnet structure and promote the development of materials with given properties.
I. M. Sil'vestrova and N. N. Sobolev The P. N. Lebedev Physical Institute, Academy of Sciences of the U.S.S.R., Moscow, U.S.S.R. The Mandel'shtam-Brillouin spectra of single crystals of Zr02-Yz03 and Hf02-Yz03 solid solutions have been measured and the results explained qualitatively. Using the methods of Mandel'shtam-Brillouin spectra and ultrasound propagation the elastic and photoelastic constants of single crystals of ZrOz-YzO, and HfOt-Y203 solid solutions have been found and their dependence on the composition obtained. The elastic and photoelastic properties of single crystals of these solid solutions are discussed.
Characteristic features of the Brillouin‐Mandelshtam spectrum of crystalline PbMoO4 are investigated. More accurate values of the photoelastic constants and the optical purity of this particular crystal are determined.
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