Shopa R. Temperature behaviour of optical anisotropy for nonlinear dielectrics with centrosymmetric paraphase

Українська версія

Thesis for the degree of Candidate of Sciences (CSc)

State registration number

0407U004692

Thesis Registration Form

0407U004692.pdf

Applicant for

Specialization

  • 01.04.10 - Фізика напівпровідників і діелектриків

24-10-2007

Specialized Academic Board

Д 35.051.09

Ivan Franko National University of Lviv

Essay

The influence of isotopic and isomorphous substitutions, as well as the temperature evolution of structure on crystal optical, dielectric and dilatometric properties of nonlinear anisotropic dielectrics with parent centrosymmetric phase is studied. The optical activity in the nonlinear dielectrics with centrosymmetric paraphases is shown to be regarded as a secondary order parameter. Practical importance of the first fluctuation correction to the Landau theory is proved, when dealing with description of temperature behaviour of optical and dielectric characteristics. In the conditions of slow temperature variations for the case of incommensurate "re-enter" phases, the structure-defects interactions are demonstrated to be similar to those occurring in the other types of incommensurate phases.

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Files

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