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Oxygen-17 nuclear magnetic resonance measurements on apatite-type lanthanum silicate (La9.33(SiO4)6O2)

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Title: Oxygen-17 nuclear magnetic resonance measurements on apatite-type lanthanum silicate (La9.33(SiO4)6O2)
Authors: Kiyono, Hajime Browse this author
Matsuda, Yuuya Browse this author
Shimada, Toshihiro Browse this author →KAKEN DB
Ando, Mariko Browse this author
Oikawa, Itaru Browse this author
Maekawa, Hideki Browse this author
Nakayama, Susumu Browse this author
Ohki, Shinobu Browse this author
Tansho, Masataka Browse this author
Shimizu, Tadashi Browse this author
Florian, Pierre Browse this author
Massiot, Dominuqie Browse this author
Keywords: Apatite
Lanthanum silicate
Oxide-ion conductor
Solid-state NMR
MQ MAS
High-temperature NMR
Issue Date: Nov-2012
Publisher: Elsevier
Journal Title: Solid State Ionics
Volume: 228
Start Page: 64
End Page: 69
Publisher DOI: 10.1016/j.ssi.2012.09.016
Abstract: We used magic angle spinning (MAS), multiquantum (MQ)-MAS, and high-temperature (HT) nuclear magnetic resonance (NMR) measurements to investigate the oxide-ion conduction path of oxygen-17 (O-17) in apatite-type lanthanum silicate La9.33(SiO4)6O2. A highly crystalline apatite-type lanthanum silicate was specifically synthesized for the measurements. MAS and MQ-MAS NMR confirmed that four kinds of oxide-ion sites are present in the structure and showed a small extra peak (< 1%) possibly due to an interstitial site. The high-temperature measurements showed that the line shape changed and sharpened with increasing temperature from 200 °C, and the peak position shifted at 700 °C. The comparison of the results between MAS NMR (room-temperature) and HT static NMR showed the exchange of oxide ions bonded to Si (O1, O2, and O3) but the apparent exchange between the oxide ions (O1, O2, and O3) and the oxide ion at the isolated site (O4) is not observed. The exchange of the oxide ions that are bonded to Si (O1, O2, and O3) suggests that they are the main diffusion species in oxide-ion conductivity.
Relation: http://www.sciencedirect.com/science/article/pii/S0167273812005401
Type: article (author version)
URI: http://hdl.handle.net/2115/51907
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 島田 敏宏

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