Zobrazeno 1 - 10
of 23
pro vyhledávání: '"Soo Han Oh"'
Publikováno v:
International Journal of Molecular Sciences, Vol 22, Iss 13, p 7116 (2021)
The inelastic interaction between the incident photons and acoustic phonons in the taurine single crystal was investigated by using Brillouin spectroscopy. Three acoustic phonons propagating along the crystallographic b-axis were investigated over a
Externí odkaz:
https://doaj.org/article/e0f29d580b6845038844fcc8c594fac4
Publikováno v:
Molecules, Vol 23, Iss 12, p 3171 (2018)
The nature of precursor phenomena in the paraelectric phase of ferroelectrics is one of the main questions to be resolved from a fundamental point of view. Barium titanate (BaTiO3) is one of the most representative perovskite-structured ferroelectric
Externí odkaz:
https://doaj.org/article/cdc3bb82ba66400495cb4d905176a9f8
Publikováno v:
Materials, Vol 11, Iss 6, p 1000 (2018)
The elastic properties of unpoled and prepoled (Na1/2Bi1/2)TiO3-xBaTiO3 (NBT-xBT) single crystals near the morphotropic phase boundary were investigated as a function of temperature using Brillouin light scattering. The acoustic mode frequency and th
Externí odkaz:
https://doaj.org/article/907ae83af2634a3c89eb06c5f1b080e7
Publikováno v:
Current Applied Physics. 20:835-840
Acoustic anomalies of relaxor ferroelectric Na1/2Bi1/2TiO3 single crystals were investigated over a wide temperature range from −196 °C to 900 °C by using Brillouin spectroscopy. The longitudinal sound velocity, the acoustic absorption coefficien
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e4b61b7a837b398e432bad98aa022e2b
https://doi.org/10.1016/j.cap.2020.04.002
https://doi.org/10.1016/j.cap.2020.04.002
Autor:
Yasuhiro Fujii, Tatsuya Mori, Yohei Yamamoto, Soo Han Oh, Hitoshi Kawaji, Suguru Kitani, Jae-Hyeon Ko, Shin Nakagawa, Akitoshi Koreeda
Publikováno v:
2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz).
We performed terahertz time-domain spectroscopy and low-frequency Raman scattering on polymethyl methacrylate to investigate the boson peak (BP) which is a universal excitation in glass, and the fracton which is expected to be expressed in polymer gl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d66cd0f96b920d693629ad71b9bbe50c
https://doi.org/10.1109/irmmw-thz50926.2021.9566942
https://doi.org/10.1109/irmmw-thz50926.2021.9566942
Autor:
Soo Han Oh, Yasuhiro Fujii, Shin Nakagawa, Yohei Yamamoto, Akitoshi Koreeda, Jae-Hyeon Ko, Yu Duan, Suguru Kitani, Tatsuya Mori
Publikováno v:
2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz).
The complex dielectric constant of 17.3 mol% lithium chloride aqueous solution, which is a typical hydrogen-bonded glass system, was determined from 291 K to 14 K using terahertz time-domain spectroscopy. The boson peak appeared at 1.3 THz at 14 K, s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0bb0b21c5028abf852db7eb3050437ba
https://doi.org/10.1109/irmmw-thz50926.2021.9567599
https://doi.org/10.1109/irmmw-thz50926.2021.9567599
Publikováno v:
International Journal of Molecular Sciences
Volume 22
Issue 13
International Journal of Molecular Sciences, Vol 22, Iss 7116, p 7116 (2021)
Volume 22
Issue 13
International Journal of Molecular Sciences, Vol 22, Iss 7116, p 7116 (2021)
The inelastic interaction between the incident photons and acoustic phonons in the taurine single crystal was investigated by using Brillouin spectroscopy. Three acoustic phonons propagating along the crystallographic b-axis were investigated over a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ebd7bc5eb915290d0c1e15ff999a67b7
https://pubmed.ncbi.nlm.nih.gov/34281169
https://pubmed.ncbi.nlm.nih.gov/34281169
Publikováno v:
Current Applied Physics. 19:1195-1203
The acoustic and vibrational properties of Mn-doped (Na1/2Bi1/2)TiO3-xBaTiO3 with x = 0.05 were investigated by using Brillouin and Raman spectroscopies and compared with those of undoped crystals. The mode frequency and the half width of the Brillou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8b582c8f16b9290719ed2815bd88091f
https://doi.org/10.1016/j.cap.2019.08.001
https://doi.org/10.1016/j.cap.2019.08.001
Autor:
Jin San Choi, Jae-Hyeon Ko, Soo Han Oh, Aman Ullah, Muhammad Sheeraz, Tae Heon Kim, Nguyen Xuan Duong, Sang Mo Yang, Kyou Hyun Kim, Jong-Seong Bae, Ill Won Kim, Jongchul Jeon, Chang Won Ahn, So Yeon Lim
Publikováno v:
Ceramics International. 45:16305-16310
We demonstrate a phase transition between BaTiO3 polymorphs induced by Ni substitution experimentally. The structural evolution of tetragonal-to-hexagonal polymorph in Ni-doped BaTiO3 ceramics is observed macroscopically and then, visualized in an at
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::901a0af8d4fe4cc4415b04d7423a1277
https://doi.org/10.1016/j.ceramint.2019.05.156
https://doi.org/10.1016/j.ceramint.2019.05.156
Autor:
Seiji Kojima, Hitoshi Kawaji, Soo Han Oh, Tatsuya Mori, Takanari Kashiwagi, Suguru Kitani, Jeonghyuk Kim, Yasuhiro Fujii, Akitoshi Koreeda, Seiji Inaba, Jae-Hyeon Ko
Publikováno v:
2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz).
For disordered systems, a universal excitation called the boson peak appears in the terahertz range. In this study, we performed terahertz time-domain spectroscopy on an oxide glass with entropic elasticity—mixed alkali metal metaphosphate glass wi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ae5637129c0a00210bfeca412111d7c4
https://doi.org/10.1109/irmmw-thz46771.2020.9370785
https://doi.org/10.1109/irmmw-thz46771.2020.9370785