Search

Your search keyword '"Miho Ako"' showing total 4 results
Start Over Author "Miho Ako"
4 results on '"Miho Ako"'

1. Formation of solid solutions in wide miscibility-gap perovskite-type oxide system of Ba1−xCaxZrO3 over the entire Ca composition range

Author

Jun-ichi Fujisawa, Miho Ako, and Minoru Hanaya

Subjects
Range (particle radiation), Materials science, Spinodal decomposition, Analytical chemistry, Oxide, General Chemistry, Condensed Matter Physics, chemistry.chemical_compound, chemistry, Materials Chemistry, Ceramics and Composites, Composition (visual arts), Perovskite (structure), Solid solution
Published
2020

2. A layered wide-gap oxyhalide semiconductor with an infinite ZnO2 square planar sheet: Sr2ZnO2Cl2

Author

Yu Su, Takatsugu Masuda, Hiraku Ogino, Tetsuo Uchikoshi, Miho Ako, Maxim Avdeev, Akira Miura, Alexei A. Belik, Shinichiro Asai, Yoshihiro Tsujimoto, and Kazunari Yamaura

Subjects
Materials science, Absorption spectroscopy, chemistry.chemical_element, 02 engineering and technology, Zinc, Electronic structure, 010402 general chemistry, 01 natural sciences, Molecular physics, Catalysis, Square (algebra), Optics, Planar, Atomic orbital, Materials Chemistry, business.industry, Metals and Alloys, General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Semiconductor, chemistry, Ceramics and Composites, Direct and indirect band gaps, 0210 nano-technology, business
Abstract

A new square-planar zinc oxyhalide, Sr2ZnO2Cl2, was successfully synthesized using a high-pressure method. Absorption spectroscopy revealed an indirect band gap of 3.66 eV. Electronic structure calculations indicated a strong hybridization between Zn 3dx2−y2 and O 2p orbitals, which is distinct from tetrahedrally coordinated ZnO.

Published
2017

3. A layered wide-gap oxyhalide semiconductor with an infinite ZnO

Author

Yu, Su, Yoshihiro, Tsujimoto, Akira, Miura, Shinichiro, Asai, Maxim, Avdeev, Hiraku, Ogino, Miho, Ako, Alexei A, Belik, Takatsugu, Masuda, Tetsuo, Uchikoshi, and Kazunari, Yamaura

Abstract

A new square-planar zinc oxyhalide, Sr

Published
2017

4. Formation of Ba1−Ca TiO3 solid solutions beyond the solubility limit by ‘sputter-anneal’ method

Author

Miho Ako, Jun-ichi Fujisawa, Takeshi Kogure, Yumie Kobayashi, Minoru Hanaya, and Toru Kyomen

Subjects
Permittivity, Materials science, Annealing (metallurgy), Analytical chemistry, 02 engineering and technology, Sputter deposition, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 010406 physical chemistry, 0104 chemical sciences, Amorphous solid, law.invention, law, Sputtering, Physical and Theoretical Chemistry, Solubility, Crystallization, 0210 nano-technology, Instrumentation, Solid solution
Abstract

To produce Ba1−xCaxTiO3 solid solutions beyond the solubility limit, we performed rf magnetron sputtering using the targets of (BaTiO3)1−x(CaTiO3)x with compositions x from 0 to 1 onto quartz glass substrates without heating the substrates and annealed the formed film samples. The as-prepared film samples by the sputtering were confirmed to have amorphous structures. By annealing the as-prepared amorphous film samples at the rather low temperature of 800 °C for 3 h, crystallization proceeded in the samples, and we successfully obtained Ba1−xCaxTiO3 solid solutions in whole the composition range without phase separation. The permittivity of the formed solid solutions exhibited a peculiar Ca composition dependence. The dependence was well explained by the formation of extra space around Ca2+ ions substituted for Ba2+ ions.

Published
2019

Catalog

Books, media, physical & digital resources
See catalog results