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Temperature dependence of the modulation wavelength in Co-åkermanite

Autor: K. Kusaka, Kenji Hagiya, M. Ohmasa

Publikováno v: Philosophical Magazine. 87:2635-2640

Two-dimensional modulation in synthetic Co-akermanite, Ca2CoSi2O7, has been precisely studied using synchrotron X-ray diffraction methods in the temperature range between 180 and 523 K to determine the temperature dependence of q (the magnitude of th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::934e2b9d441b1a2796c5c8c935301f75
https://doi.org/10.1080/14786430701365033

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Low-temperature studies on the two-dimensional modulations in åkermanite-type crystals: Ca 2 MgSi 2 O 7 and Ca 2 ZnSi 2 O 7

Autor: Bagautdin Bagautdinov, N. Ikeda, Katsuhiro Kusaka, M. Ohmasa, K. Hagiya, S. Noguchi, Kazuaki Iishi

Publikováno v: Physics and Chemistry of Minerals. 29:346-350

Two-dimensional modulation in synthetic akermanite (Ca2MgSi2O7) and hardystonite (Ca2ZnSi2O7) has been studied by the single-crystal X-ray diffraction methods in the temperature range between 18 and 297 K. It is found that change of the modulation wa

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ffa7fa3b046619a1e437f5ebb0517762
https://doi.org/10.1007/s00269-002-0238-6

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The structure modulation in the Bi2Sr4Fe2O10 compound

Autor: A. V. Dubovitskii, K Hagiya, V. Sh. Shekhtman, E. V. Suvorov, V. Sedykh, I.S. Smirnova, M Ohmasa, Bagautdin Bagautdinov

Publikováno v: Physica C: Superconductivity. 355:87-96

The influence of the extra Sr layer introduced into Bi2Sr3Fe2O9 (the obtained Bi2Sr4Fe2O10 compound) on the structure modulation has been investigated by X-ray diffraction analysis, electron microscopy and Mossbauer spectroscopy. It has been found th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a3a59f30eb0a1e1879edbc72d4f4be2b
https://doi.org/10.1016/s0921-4534(00)01775-5

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Determination of structures of Ca 2 CoSi 2 O 7 , Ca 2 MgSi 2 O 7 , and Ca 2 (Mg 0.55 Fe 0.45 )Si 2 O 7 in incommensurate and normal phases and observation of diffuse streaks at high temperature

Autor: K. Hagiya, M. Ohmasa, M. Mukai, Kazuaki Iishi, Katsuhiro Kusaka, Y. Okano, N. Haga

Publikováno v: Physics and Chemistry of Minerals. 28:150-166

The structures of Ca2CoSi2O7, Ca2MgSi2O7, and Ca2(Mg0.55Fe0.45)Si2O7 have been determined in the temperature range between 297 and 773 K with arbitrary intervals. The structures of the incommensurate phase of the three compounds are characterized by

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0d42888d1b6c93c9ced46ae0d09d12cd
https://doi.org/10.1007/s002690000147

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

Autor: M. Ohmasa, Kazuaki Iishi, Katsuhiro Kusaka, K. Hagiya

Publikováno v: Ferroelectrics. 250:79-82

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

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::10d7b85697f45ccd6d96837c384b66d7
https://doi.org/10.1080/00150190108225037

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

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

Publikováno v: Ferroelectrics. 250:59-62

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 th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::57cdc3bfc4bfcd08e902ba2d4bba06b7
https://doi.org/10.1080/00150190108225032

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

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

Publikováno v: Ferroelectrics. 250:71-74

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 tem

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f2ec091518ee983938704c285af9cfe8
https://doi.org/10.1080/00150190108225035

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Symmetry Information Inherent in Powder Diffraction Data: α- and β-Quartz as Examples

Autor: H. Tokushima-Houki, K. Ohsumi, M. Ohmasa, H. Toraya

Publikováno v: Journal of Applied Crystallography. 30:254-258

Laue classes of powder diffraction data for tetragonal, hexagonal and cubic crystal families can be derived from interpretation of the concentration of peaks in Patterson functions that are transformed from weighted reciprocal lattices constructed wi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d1eaf81be99f6a9dded9f46a6bc109cd
https://doi.org/10.1107/s0021889896011193

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Determination of Laue class from diffraction data of polycrystalline materials

Autor: M. Ohmasa, K. Ohsumi

Publikováno v: Acta Crystallographica Section A Foundations of Crystallography. 51:87-91

It has long been believed that superposition of Debye–Scherrer lines caused by symmetry of the reciprocal lattice should suppress true information on Laue symmetry of crystal systems with high symmetry: trigonal, tetragonal, hexagonal and cubic. An

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::23135b11c307e84fbb93b6be58704746
https://doi.org/10.1107/s0108767394007750

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