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3 results on '"Katsuhiro Kusaka"'

1. Variation of ordered arrangement of atoms in incommensurate Ca2CoSi2O7accompanied by change of modulation wavelength

Author

M. Ohmasa, Kazuaki Iishi, Katsuhiro Kusaka, and K. Hagiya

Subjects
Wavelength, Polyhedron, Materials science, Distribution (mathematics), Condensed matter physics, Modulation (music), Tetrahedron, Crystal structure, Condensed Matter Physics, Space (mathematics), Variation (astronomy), Electronic, Optical and Magnetic Materials
Abstract

A program to visualize an incommensurate structure in the three-dimensional space has been developed and applied to study the changes of long range order in the incommensurate structure of Ca2CoSi2O7 with respect to the variation of the components q of the modulation wave vectors. The results indicate that the incommensurate structure is characterized by variations of the octagonal distribution of bundles along c that are formed by four arrays of six-coordinated Ca-O polyhedra surrounding a central array of CoO4 tetrahedra.

Published
2001
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2. Two-dimensional incommensurate structures of (Sr0.13Ca0.87)2CoSi2O7and Ca2CoSi2O7: Effects of substitution of interlayer cations

Author

M. Ohmasa, K. Hagiya, Katsuhiro Kusaka, Kazuaki Iishi, and Bagautdin Bagautdinov

Subjects
Bond length, Crystallography, chemistry.chemical_compound, Materials science, chemistry, Substitution (logic), Calcium silicate, Crystal structure, Partial substitution, Condensed Matter Physics, Electronic, Optical and Magnetic Materials
Abstract

The modulated structures of (Sr0.13Ca0.87)2CoSi2O7 at 293K and Ca2CoSi2O7 at 293, 393, 468K are compared to find the peculiarity of the partial substitution of Ca by larger alkaline-earth atoms such as Sr. The similarities in structural effects of this substitution and heating are found.

Published
2001
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3. Disordered state in IC(incommensurate)-and N(normal)-phases of Ca2CoSi2O7deduced from variation of thermal displacement factors

Author

K. Hagiya, M. Ohmasa, Kazuaki Iishi, Katsuhiro Kusaka, and N. Haga

Subjects
Computer Science::Hardware Architecture, Materials science, Condensed matter physics, Transition temperature, Modulation (music), State (functional analysis), Crystal structure, Condensed Matter Physics, Thermal displacement, Anisotropy, Variation (astronomy), Displacement (vector), Electronic, Optical and Magnetic Materials
Abstract

The structure of Ca2CoSi2O7, has been determined at several temperatures in the range between 297 and 773K. Analyses of the anisotropic displacement parameters clarifies the disorder of the modulation waves that develop in the structure at higher temperatures. The evolution of the disorder in the structures was ascertained by observation of circular diffuse streaks in the vicinity of the transition temperature (T IC-N) between the IC-and N-phase.

Published
2001
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