Low frequency internal friction study of lithium ion conductor Li5La3Ta2O12

Low frequency internal friction study of lithium ion conductor Li5La3Ta2O12
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锂离子导体Li5La3Ta2O12的低频内耗研究

DOI:
10.1016/j.msea.2008.09.113
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发表时间:
2009-09
影响因子:
6.4
通讯作者:
Zhang, T.
Zhang, T.
中科院分区:
材料科学1区
文献类型:
--
作者:
Fang, Q.F.;Wang, X.P.;Wang, W.G.;Gao, Y.X.;Zhang, T.

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用内耗法研究了锂离子在Li5La3Ta2O12基电解液中的扩散过程。在Li5La3Ta2O12中观察到明显的弛豫型IF峰(实际上由两个组分组成):低温峰P1和高温峰P2。中频峰的弛豫参数分别为:P1=0.81 eV,τ01=2×10−14s;P2:E2=0.87 eV,τ02=7×10−14s。La位(Li_6BaLa_2Ta_2O_(12))部分Ba替代后,P_2峰高度显著降低,P_1峰高度不变,但都向低温方向移动。认为P_1和P_2峰的形成机制与锂离子的两次扩散过程有关:48g↔48g和48g↔24d。
The diffusion processes of lithium ions in Li5La3Ta2O12based electrolytes were investigated by internal friction (IF) method. Prominent relaxation-type IF peaks (actually consisted of two components) in Li5La3Ta2O12were observed: peak P1at lower temperature and peak P2at higher temperature. The relaxation parameters for the IF peaks are evaluated as E1=0.81eV, τ01=2×10−14s for peak P1and E2=0.87eV, τ02=7×10−14s for peak P2, respectively. After partial Ba substitution at La site (Li6BaLa2Ta2O12), peak P2decreases dramatically in height while peak P1does not change in height, but both peaks shift toward lower temperature. The mechanism of the P1and P2peak is suggested to be associated with two diffusion processes of lithium ions: 48g↔48g and 48g↔24d, respectively.
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发表时间: 1972
期刊: --
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