Pankivskyi Y. Evolution of the metastable states in the incommensurate phases of improper ferroelectric and ferroelastic crystals

Українська версія

Thesis for the degree of Candidate of Sciences (CSc)

State registration number

0406U004753

Thesis Registration Form

0406U004753.pdf

Applicant for

Specialization

  • 01.04.10 - Фізика напівпровідників і діелектриків

08-11-2006

Specialized Academic Board

Д 35.051.09

Ivan Franko National University of Lviv

Essay

The evolution of the metastable states has been investigated in incommensurate phase of [N(CH3)4]2МеCl4 (Me = Cu, Zn, Fe), (CH3)3NCH2COOHCaCl2 2H2O, RbHSeO4, MgSiF6*6H2O, MgGeF6*6H2O crystals with the employment of the optical and dielectric methods. It has been shown that in the conditions of "viscous" interaction of modulated structure with defects the incommensurate phase can be considered as sequence of the metastable states divided by the transitional temperature regions. It has been found that the difference of birefringence anomalies for different directions of light propagation is affected by the phase of the order parameter along modulation axis and the incommensurability wave vector in perpendicular directions. The new state of the incommensurately modulated structure as the superposition of the few modulation waves in one crystallo-physic direction was found.

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Files

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