Gorda O. The anisotropy of elastic properties and the nature of chemical bonds of high- and low-symmetric crystals

Українська версія

Thesis for the degree of Candidate of Sciences (CSc)

State registration number

0415U001120

Thesis Registration Form

0415U001120.pdf

Applicant for

Specialization

  • 01.04.07 - Фізика твердого тіла

28-11-2014

Specialized Academic Board

Д 76.051.01

Essay

The thesis is devoted to the investigation of anisotropy of elastic properties, the nature of interatomic forces and type of chemical bond in the chalcogenides Pb and Sn (PbS, PbSe, PbTe, Pb1-xSnxSe, Pb1-xSnxTe, (PbSe)1-x(SnTe)x) and other types of single crystals of lattices NaCl, CsCl, CaF2 , lattices of type diamond and sphalerite and single crystals ZnAs2 (monoclinic syngony). The temperature dependences of lattice periods, the coefficients of thermal expansion, velocity of propagation of ultrasonic waves in different crystallographic directions, elastic modulus, shear modulus, relationships Cauchy, degrees ionicity and the main parameters of the dynamics of crystal lattices were determinated. From the experimental results of the were performed analysis of structural stability, elastic anisotropy and the nature of the chemical bond in the investigated single crystals.

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