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3 Acta Physica Polonica A

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Structural Determination of Epitaxial Formations in Layered Cuprates

100%

Leonyuk L. , Maltsev V. , Babonas G.-J.

Acta Physica Polonica A

1997

tom 92

nr 1

143-146

The fragment approximation is used for the description of the layered cuprate structures. The characteristic structural features are distinguished which genetically relate all the layered cuprates. The classification scheme for the whole family of layered cuprates is analyzed in the fragment approximation and a possible extension of the scheme is discussed.

Epitaxial Intergrowth of Isostructural Phases in Bi-2212 Single Crystals

100%

Babonas G.-J. , Leonyuk L. , Maltsev V.

Acta Physica Polonica A

1997

tom 92

nr 1

251-254

The isostructural phases in Bi-2212-type HTSC were studied by structural and optical methods. The epitaxial intergrowth was shown to be a feature typical of single crystals composed of several isostructural phases. The physical properties of the multi-phase samples were interpreted on the basis of reference mono-phase samples. A presence of the intergrowth interface was assumed to be responsible for particular features in multi-phase samples.

Electron Microscopy and X-ray Structural Investigations of Incommensurate Spin-Ladder Sr_{4.1}Ca_{4.7}Bi_{0.3}Cu_{17}O_{29} Single Crystals

63%

Dłużewski P. , Pietraszko A. , Kozłowski M. , Szczepańska A. , Górecka J. , Baran M. , Leonyuk L. , Babonas G.-J. , Lebedev O. , Szymczak R.

Acta Physica Polonica A

2000

tom 98

nr 6

729-737

Transmission electron microscopy and X-ray diffraction proved chain ladder incommensurate single crystal structure of investigated samples. The incommensurate ratio was determined from the X-ray and electron diffraction being equal to 0.704. Diffuse scattering intensities localised on the planes perpendicular to the c*-axis and passing through the spots originating from the periodicity of chain sublattice were detected. High-angle grain boundary or twinning formed by rotation of 33.3° around [100] direction was observed. High-resolution electron microscopy images revealed the stacking faults in ac planes.