Chin. Phys. Lett.  2014, Vol. 31 Issue (1): 016201    DOI: 10.1088/0256-307X/31/1/016201
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
Correlation of Lithium Ionic Diffusion with Nb Concentration in Li7?xLa3Zr2?xNbxO12 Evaluated by an Internal Friction Method
XIA Yu, WANG Xian-Ping**, GAO Yun-Xia, HU Jing, ZHUANG Zhong, GUO Li-Jun, FANG Qian-Feng, LIU Chang-Song
Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031
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XIA Yu, WANG Xian-Ping, GAO Yun-Xia et al  2014 Chin. Phys. Lett. 31 016201
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Abstract Solid lithium-ion conductors Li7?xLa3Zr2?xNbxO12 (x=0.25, 0.5, 1, 1.5) with cubic garnet structure are successfully prepared by a solid state reaction method, and the effects of Nb concentration on lithium ion diffusion are investigated by means of internal friction (IF) technique. A prominent relaxation-type IF peak (actually composed of two components) is observed in each Nb doped Li7La3Zr2O12 compound: with apeak PL at lower temperature and a peak PH at higher temperature. The mechanisms of the two components are suggested to be associated with two diffusion processes of lithium ions via vacancies: 48g?48g and 48g?24 d. The relaxational strength of the IF peak gradually decreases, which is accompanied by the activation energy increasing from 0.45 eV to 0.64 eV with the increasing Nb doping level. The corresponding mechanism is ascribed to originate from lattice contraction as well as the lower concentration of diffusion ions induced by the substitution of Zr4+ by Nb5+.
Received: 12 October 2013      Published: 28 January 2014
PACS:  62.40.+i (Anelasticity, internal friction, stress relaxation, and mechanical resonances)  
  66.30.-h (Diffusion in solids)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/31/1/016201       OR      https://cpl.iphy.ac.cn/Y2014/V31/I1/016201
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XIA Yu
WANG Xian-Ping
GAO Yun-Xia
HU Jing
ZHUANG Zhong
GUO Li-Jun
FANG Qian-Feng
LIU Chang-Song
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