The optical absorption spectrum, luminescence and photoconductivity on single crystals PbMg1/3Nb2/3O3 and on ceramics Pb0.91La0.09(Zr0.65Ti0.35)O-3 are investigated in the wide temperature range. The luminescence spectrum correlates with the photoconductivity spectrum. The position of the maximum of the luminescent emission spectrum indicates the origin of the charge carriers emitted from the defect centers. On the basis of the data the properties of the local centers are determined, and the phenomenological approach to the relaxor theory is discussed.

The optical absorption spectrum, luminescent emission and photoconductivity were investigated in single crystal PbMg1/3Nb2/3O3 and in the Pb0.91La0.09(Zr0.65Ti0.35)O-3 ceramics in the wide temperature region. The spectrum of the luminescence correlates with spectrum of photoconductivity emission. The position of the maximum of the luminescence emission indicates the origin of the charge carriers for the emissions from the defect centers. On the basis of these data the properties of the local centers were found, and phenomenological approach to a relaxor theory is discussed.

Phenomenological approach to a relaxor theory is developed and some experi-mental results in the support of this theory are received. The optical absorption spectrum, luminescent emission and photoconductivity are investigated in the wide temperature region in PbMg1/3Nb2/3O3 . On the basis of this data the density of states on the impurity band and the velocity of charge carrier localization are found. The probability distribution of relaxation time, g (ln(tau))dln(tau), is found analytically as the function of the density of states in the impurity polaron band. The temperature dependences of dielectric response of relaxor ferroelectrics are described in the framework of the Landau-Ginzburg-Devonshire theory of phase transitions. The properties of local centers and polaron localization dynamics are studied.

Phenomenological approach to a relaxor theory is developed and some experimental results in the support of this theory are received. The optical absorption spectrum, luminescent emission and photoconductivity are investigated in the wide temperature region in PbMg1/3Nb2/3O3. On the basis of this data the density of states on the impurity band and the velocity of charge carrier localization are found. The probability distribution of relaxation time, g(ln(tau))d ln(tau), is found analytically as the function of the density of states in the impurity polaron band. The temperature dependences of dielectric response of relaxor ferroelectrics are described in the framework of the Landau-Ginzburg-Devonshire theory of phase transitions. The properties of local centers and polaron localization dynamics are studied.

Propagation of IR-rays through the easy-plane antiferromagnetic crystal alpha-Fe2O3-is investigated. In Cotton-Mouton geometry, magnetic birefringence is measured and magnetooptical constants are estimated; the role of the nonhomogenous magnetic field is investigated as well.

Results of optical, EPR and acoustical EPR investigations of Y3Al5O12 crystals undoped and doped with iron-group ions are presented. Optical and structural properties of reduced and oxidized crystals and its transformations under intense light irradiation in the UV and visible range are investigated. The energy levels of the Fe3+, Fe2+ impurity ions and of the related F+ and F centres are studied. The first observation of the F centres and Cr4+ ions is presented.

A review of applications of optoacoustic methods, based on the pulse laser generation of the ultrasonic waves in samples studied is given. The paper demonstrates the possibilities of this method in determine the elastic, photoelastic, piezoelectric constants, optical quality and damage stability of ferro- and piezoelectrics.

Using radio-, acoustic-, and optical spectroscopy methods, we have studied the valent states and structure of energy levels of a number of paramagnetic ions in the nonsymmetric oxygen-containing crystals. It has been found out that the paramagnetic ions give rise to the local changes of the elastic and optical characteristics of ferropiezoelectrics.