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Fingerprint Dive into the research topics where Yasumasa Koyama is active. These topic labels come from the works of this person. Together they form a unique fingerprint.

  • 1 Similar Profiles
Transmission electron microscopy Engineering & Materials Science
Ferroelectric materials Engineering & Materials Science
transmission electron microscopy Physics & Astronomy
Perovskite Engineering & Materials Science
Electron diffraction Engineering & Materials Science
Phase transitions Engineering & Materials Science
Temperature Engineering & Materials Science
electron diffraction Physics & Astronomy

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Research Output 1978 2019

  • 1174 Citations
  • 15 h-Index
  • 132 Article
  • 22 Conference contribution
  • 6 Chapter

Disordered Jahn-Teller-polaron states in the simple perovskite manganite Ca1−xLaxMnO3 with 0.15 ≦ x ≦ 0.28

Endo, T., Goto, T., Inoue, Y. & Koyama, Y., 2019 Jan 1, In : journal of the physical society of japan. 88, 7, 074708.

Research output: Contribution to journalArticle

orbitals
symmetry
Japan
diffraction patterns
electron diffraction

Effect of Ca doping on modulated structures in multiferroic Bi1−xCaxFeO3

Hiroyama, T., Hirata, A., Inoue, Y., Horibe, Y. & Koyama, Y., 2019 Jan 1, In : journal of the physical society of japan. 88, 5, 054601.

Research output: Contribution to journalArticle

antiphase boundaries
room temperature
diffraction patterns
electron diffraction
modulation

Quadruple superstructure with antiferroic ionic displacements in B i1-x S mxFe O3

Horibe, Y., Nomoto, M., Inoshita, T., Watanabe, K., Cheong, S. W., Inoue, Y. & Koyama, Y., 2019 Jul 12, In : Physical Review B. 100, 2, 024105.

Research output: Contribution to journalArticle

Phase boundaries
Freezing
Rare earths
Ferroelectric materials
Transmission electron microscopy

Crystallographic features of the approximant H (Mn7Si2V) phase in the Mn–Si–V alloy system

Nakayama, K., Komatsuzaki, T. & Koyama, Y., 2018 Jul 13, In : Philosophical Magazine. 98, 20, p. 1823-1847 25 p.

Research output: Contribution to journalArticle

plane waves
disorders
intermetallics
transmission electron microscopy
matrices

Crystallographic relationship between the ¯ (Mn82Si18) and H (Mn7Si2V) phases in the Mn-Si-V alloy system

Nakayama, K., Kurihara, D. & Koyama, Y., 2018 Jan 1, In : Materials Transactions. 59, 7, p. 1051-1056 6 p.

Research output: Contribution to journalArticle

Quasicrystals
Phase shift
Intermetallics
Crystal structure
Transmission electron microscopy