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Theoretical Study of the Ferroelastic Domain Structure in La_{0.95}Sr_{0.05}Ga_{0.9}Mg_{0.1}O_{3-x}

100%

Savytskii D., Tataryn T., Martynyuk N., Bismayer U.

issue 1

48-61

Theoretical analysis of the ferro-elastic domain structure of a La_{0.95}Sr_{0.05}Ga_{0.9}Mg_{0.1}O_{2.925} crystal in three different crystallographic phases is presented. Parameters of these configurations are obtained using group theoretical approach, the method of spontaneous deformation as well as theoretical interpretation of twinning resulting from mechanical deformation (mechanical twinning theory). In the three phases of La_{0.95}Sr_{0.05}Ga_{0.9}Mg_{0.1}O_{2.95} - trigonal, orthorhombic and monoclinic - the parameters of ferro-elastic domain structures are determined; namely the quantity of orientation states, symmetry elements of connection between states, orientations and types of domain walls, tensors of spontaneous deformations of the perovskite-type cells for every orientation state, elements of twin shifts, which are needed for the reorientation of some orientation states to others. By using the found parameters of bidomain configurations a mechanism is proposed, which causes chevron-like domain configurations in compounds with martensitic phase transitions.

Symmetry Pattern and Domain Wall Structure in GdFeO_{3} Perovskite Type

100%

Savytskii D., Tataryn T., Bismayer U.

issue 1

78-85

Symmetry relations between the domain states in GdFeO_{3} type crystals have been obtained using group-theoretical analysis for prototype and ferroelastic space groups. Models for possible domain pairs are developed. The ion locations on the domain boundary were estimated as intermediate positions between the sites in crystal structure of neighboring domain states. It is shown that the crystalline structure of the boundary approaches to the prototype phase structure - the ideal ABO_{3} perovskite-type structure, however certain deformations remain. In addition to the shifts of the all ions the tilts of oxygen octahedra of the some type and related displacements of A ions should take place during the switching of orientation states. The tilts of octahedra and displacements of A ions are sufficient to form translation states (antiphase domains). Antiphase domains can have boundaries between themselves basically along the three faces of the orthorhombic cell.

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2 Acta Physica Polonica A

2 2010

2 Bismayer U.

2 Savytskii D.

2 Tataryn T.

1 Martynyuk N.

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Theoretical Study of the Ferroelastic Domain Structure in La_{0.95}Sr_{0.05}Ga_{0.9}Mg_{0.1}O_{3-x}

Symmetry Pattern and Domain Wall Structure in GdFeO_{3} Perovskite Type