期刊
CRYSTENGCOMM
卷 20, 期 10, 页码 1375-1382出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ce01910f
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资金
- Bundesministerium fur Bildung and Forschung [05K14OFA]
- Russian Science Foundation [17-12-01540]
- German-Russian Interdisciplinary Science Center (G-RISC) [P-2015a-12, P-2015a-13]
We demonstrate that the ionic conductivity of Li1+xAlxGe2-x(PO4)(3) glass-ceramic electrolytes can be tailored by adding Y2O3 to Li2O-Al2O3-GeO2-P2O5 melts. We found that the addition of 5 vol% Y2O3 causes noticeable changes in further glass crystallization process as the key parameters (glass crystallization temperature, viscosity and others) are affected. Small-angle neutron scattering data suggest that Y-containing glasses are suddenly crystallized upon heat treatment producing uniform Li1+xAlxGe2-x(PO4)(3) ceramics. Due to the lower resistance of intergrain interfaces, such samples demonstrate a specific ionic conductivity of 0.5 mS cm(-1), which is nearly 5 times higher in comparison to Y-free ceramics, prepared under similar conditions. We speculate that such an effect is caused primarily by better intergrain contact in Y-containing ceramics, along with better ionic transport in the grain bulk as evidenced by Li-7 NMR.
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