Lateral strain ratios for cubic ionic crystals

V.N. Belomestnykh1, E.G. Soboleva1
1Yurga Institute of Technology of Tomsk Polytechnic University, Leningradskaya St. 26, 652055 Yurga
Abstract
In the present work, using the known experimental data on the stiffness constants, cij, of cubic ionic singlecrystals with different types of crystal lattice (В1, В2, В3, NaClO3), we define anisotropic and isotropic (for polycrystals) Poisson’s ratios for polycrystals of halogenides, halogenates, cyanides of alkali metals and halogenides of copper, silver, thallium and ammonium. It has been established that at room temperature and atmospheric pressure LiF and copper halogenides have negative Poisson’s. At the same time, the Poisson’s <110> ratios in direction ratio is anomalously positive in the cyanides of alkali metals. Temperature (LiF, NaCN) and pressure (CuCl) dependences of Poisson’s ratios were studied.
Received: 02 June 2011   Revised: 06 June 2011   Accepted: 21 June 2011
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