ID 74506
タイトルヨミ
ヒセンケイ キョウメイ ゲンショウ オ リヨウ シタ チョウ イオン ドウデンタイ ノ ブツセイ ソクテイ
タイトル別表記
Non-Linear Resonant Ultrasound Measurements on Superionic Conductor
著者
道廣, 嘉隆 徳島大学工学部共通講座 KAKEN研究者をさがす
キーワード
Phonon-echo
Ultrasound Measurement
Lithium Ionic Diffusion
Activation Energy
Secondary Battery
資料タイプ
紀要論文
抄録
Lithium transition metal oxides are attractive as the positive electrode of secondary battery.
In this study, the phonon-echo measurements have been performed to study Li+ ionic motion
in piezoelectric LiNbO3 powder. The phonon-echo is generated by propagating waves coupling
through the anharmonicity of lattice vibrations. The decay time of the echo, T2 is connected
with the internal friction within each particle, which is functional as an acoustic oscillator.
The decrease in T2 observed above 800 K in the polycrystalline powder is explained in terms of
a Debye-type relaxation model based on Li+ ionic motion. The activation energy is estimated
as about 0.93 eV, which is in good agreement with those reported from NMR and ionic
conductivity measurements. The present study indicates that the phonon-echo measurement
is useful to elucidate the ionic motion in ionic conductors.
掲載誌名
徳島大学工学部研究報告
ISSN
03715949
cat書誌ID
AA1221470X
51
発行日
2006
フルテキストファイル
言語
jpn
部局
理工学系