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Akitoshi Koreeda,Seishiro Saikan 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
Quasielastic light scattering (QELS) in dielectric crystals has been studied in the view-point of nonequilibrium phenomenology. It has been found that the observed double QELS can be ascribed to the two limiting characteristics of a \phonon gas": the two linewidths re°ect the time scales for the nonequilibrium kinetic processes and for the equilibrated collective motions of the constituent phonons, respectively._
Yoshihiro Hirata,Yuki Koreeda,Soichiro Sameshima 한양대학교 세라믹연구소 2004 Journal of Ceramic Processing Research Vol.5 No.4
Particle connection in a two-component powder compact was quantitatively evaluated by electrical conductivity measurements. As a model system, an alumina powder (median size 0.33 µm, insulator) was mixed with an indium tin oxide powder (ITO, In2O3-SnO2, median size 0.20 µm, electronic conductor) in aqueous solutions at pH 3.0-10.3 to make different types of microstructures of the consolidated powder compacts. The rheological properties of the suspensions and the packing density and electrical conductivity of the powder compacts consolidated by filtration were greatly dominated by the dispersibility of the matrix phase particles (Al2O3) rather than by the dispersibility of the second phase particles (ITO). The Al2O3-ITO compacts prepared from a well-dispersed suspension at pH 3, showed a high electrical conductivity which was independent of the relative density (60-95%). Particle connection between ITO particles was formed in the consolidated green compacts. The electrical conductivity of the powder compacts processed with a high viscosity suspension at pH 10, was low and enhanced when the bulk density exceeded 60% relative density by sintering. The network of ITO particles was formed by a decrease in the distance between ITO particles during the densification.
Boson peak dynamics of glassy glucose studied by integrated terahertz-band spectroscopy
Kabeya, Mikitoshi,Mori, Tatsuya,Fujii, Yasuhiro,Koreeda, Akitoshi,Lee, Byoung Wan,Ko, Jae-Hyeon,Kojima, Seiji American Physical Society 2016 Physical Review B Vol.94 No.22
<P>We performed terahertz time-domain spectroscopy, low-frequency Raman scattering, and Brillouin light scattering on vitreous glucose to investigate the boson peak (BP) dynamics. In the spectra of alpha(nu)/nu(2) [alpha(nu) is the absorption coefficient], the BP is clearly observed around 1.1 THz. Correspondingly, the complex dielectric constant spectra show a universal resonancelike behavior only below the BP frequency. As an analytical scheme, we propose the relative light-vibration coupling coefficient (RCC), which is obtainable from the combination of the far-infrared and Raman spectra. The RCC reveals that the infrared light-vibration coupling coefficient C-IR(nu) of the vitreous glucose behaves linearly on frequency which deviates from Taraskin's model of C-IR(nu) = A + B nu(2) [S. N. Taraskin et al., Phys. Rev. Lett. 97, 055504 (2006)]. The linearity of C-IR(nu) might require modification of the second term of the model. The measured transverse sound velocity shows an apparent discontinuity with the flattened mode observed in the inelastic neutron scattering study [N. Violini et al., Phys. Rev. B 85, 134204 (2012)] and suggests a coupling between the transverse acoustic and flattened modes.</P>