@article{Stupka_2018, title={Sound Vibrations in Ionic Crystal Taking Electric Field Correlations into Account}, volume={58}, url={https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018397}, DOI={10.15407/ujpe58.12.1156}, abstractNote={<p>Small vibrations in a solid insulator in the presence of a self-consistent electric field with the first strength moment at the equilibrium equal to zero and the second one different from zero have been considered. A new variable, the second moment of electric field strength, was introduced into the Euler equation, and a temporal equation for this variable was derived on the basis of Maxwell equations in the hydrodynamic approximation. A wave equation was obtained, and its solutions – two transverse and one longitudinal sound vibration branches – are found. The transverse sound velocity is calculated; the results obtained correspond to those calculated using the shear modulus to an accuracy of about 10%.</p>}, number={12}, journal={Ukrainian Journal of Physics}, author={Stupka, A. A.}, year={2018}, month={Oct.}, pages={1156} }