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(LiPO
)
Kartini, E.*; Nakamura, Mitsutaka; Arai, Masatoshi; Inamura, Yasuhiro; Nakajima, Kenji; Maksum, T.*; Hoggowiranto, W.*; Putra, T. Y. S. P.*
Solid State Ionics, 262, p.833 - 836, 2014/09
Times Cited Count：19 Percentile：59.61(Chemistry, Physical)We present the neutron scattering study of superionic glass (LiI)(LiPO) by using the inelastic neutron spectrometer AMATERAS at J-PARC. From the inelastic scattering, low energy excitation or the Boson Peak appears at 
6.5 meV. The extra quasielastic scattering was observed in the energy range 1 meV 
E 3 meV at 285 K but not at 20 K. The Q dependence of the dynamical structure factor S(Q,E) can be approximated to the long-wave acoustic like density fluctuation.
Nakamura, Mitsutaka; Arai, Masatoshi; Kartini, E.*
Quasi-Elastic Neutron Scattering Conference 2006 (QENS 2006), p.169 - 176, 2007/00
no abstracts in English
Nakamura, Mitsutaka; Iwase, Hiroki; Arai, Masatoshi; Kartini, E.*; Russina, M.*; Yokoo, Tetsuya*; Taylor, J. W.*
Physica B; Condensed Matter, 385-386(1), p.552 - 554, 2006/11
Times Cited Count：3 Percentile：17.32(Physics, Condensed Matter)The mechanism of high ionic conductivity in superionic glass constitute an unsolved problem in the field of science.Here we performed inelastic neutron scattering measurements of superionic glass system (AgI)
(Ag
S)(AgPO)
by using MARI spectrometer at ISIS, and found that the 
-dependence of inelastic intensity in the energy region from 1 to 3 meV of superionic phase glass shows an excess intensity above =1.8
compared with insulator phase one. Similar phenomena were also observed in another superionic glass (AgI)
(AgPO) by using NEAT spectrometer at HMI with high resolution measurement. These results clearly suggest peculiar low energy vibrational excitations should be universal features of superionic glass.
Arai, Masatoshi; Iwase, Hiroki; Nakamura, Mitsutaka; Otomo, Toshiya*; Kartini, E.*; Ito, Keiji*; Levett, S. J.*; Bennington, S. M.*
AIP Conference Proceedings 832, p.299 - 302, 2006/05
no abstracts in English
Nakamura, Mitsutaka; Arai, Masatoshi; Kartini, E.*; Taylor, J. W.*; Russina, M.*
AIP Conference Proceedings 832, p.504 - 507, 2006/05
Superionic glasses (AgI)
(AgS)(AgPO)
and (AgI)(AgPO) have high ionic conductivity at room temperature (
S/cm). The inelastic neutron scattering measurements show that the superionic glass has larger intensity in low-energy region compared with undoped insulator glass (AgPO). For superionic glasses we find an excess intensity above =1.8 and peak profile at around 2.2 by investigating the -dependent features in low-energy region. These phenomena should be universal features of silver-salt superionic glass. We suppose that Ag-Ag dynamical correlation should promote the successive hopping process, and result in high ionic conductivity.
Nakamura, Mitsutaka; Arai, Masatoshi; Kartini, E.*
no journal, ,
no abstracts in English
Nakamura, Mitsutaka; Arai, Masatoshi; Inamura, Yasuhiro; Kartini, E.*
no journal, ,
In order to elucidate the universal mechanism of high ionic conductivity in superionic conducting materials, the comparison of dynamical properties at low-energy region between superionic phase and insulator phase should significantly contribute to our understandings. The detailed investigation of Q-dependence at low-energy region made clear that an excess intensity at around Q=2.2
is characteristic of Ag-based superionic materials, irrespective of structural periodicity. Furthermore, we found the clear correlation between dc ionic conductivity and integrated intensity at low-energy region. These features suggest the universality of high ionic conductivity mechanism of superionic conducting materials.
