The properties of the LiAlGe(PO) glass-ceramics were modified by the partial substitution of P by Si, and the synthesis process is optimized. The thermal behavior of the original LiAlGeSiPO (0 ≤ ≤ 0.5) glasses was investigated using differential scanning calorimetry (DSC), optical dilatometry and heating microscopy. The glass transition temperature () decreases from 525 to 457 °C with increasing additive content from = 0 to = 0.5. Single-phase glass-ceramics with the NASICON-type structure were synthesized up to = 1, which was confirmed by X-ray diffraction (XRD), Raman and energy-dispersive X-ray (EDX) mapping data. It has been shown that the SiO addition has a beneficial effect on the electrical properties of glass-ceramics, crystallized at 700 and 750 °C. However, heat treatment at 820 °C leads to a smaller increase in conductivity. Therefore, Si-containing glass-ceramics should be produced at lower temperatures than pure LAGP, which is 750 °C and correlated with the thermal analysis results. The influence of the SiO addition on the bulk and grain boundary conductivity of the LiAlGe(PO) has been studied in detail. The LiAlGeSiPO glass-ceramics has the highest total ionic conductivity of 4.55·10 S/cm at RT and negligible electronic conductivity of 7.5·10 S/cm, therefore can be considered as promising solid electrolytes for all-solid-state batteries.

中文翻译：

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Si改性Li1.5Al0.5Ge1.5(PO4)3微晶玻璃的合成、结构研究及性能

通过Si部分取代P来改善LiAlGe(PO)微晶玻璃的性能，并优化合成工艺。使用差示扫描量热法 (DSC)、光学膨胀法和加热显微镜研究了原始 LiAlGeSiPO (0 ≤ ≤ 0.5) 玻璃的热行为。随着添加剂含量从 = 0 增加到 = 0.5，玻璃化转变温度 () 从 525 °C 降低到 457 °C。合成了具有 NASICON 型结构的单相玻璃陶瓷，其值达到 = 1，并通过 X 射线衍射 (XRD)、拉曼和能量色散 X 射线 (EDX) 测绘数据证实。研究表明，SiO2 的添加对在 700 和 750 °C 下结晶的玻璃陶瓷的电性能有有益的影响。然而，820°C 的热处理导致电导率增加较小。因此，含硅玻璃陶瓷的生产温度应低于纯 LAGP，即 750 °C，并且与热分析结果相关。详细研究了 SiO2 添加对 LiAlGe(PO) 块体和晶界电导率的影响。LiAlGeSiPO微晶玻璃在室温下具有最高的总离子电导率，为4.55·10 S/cm，电子电导率可以忽略不计，为7.5·10 S/cm，因此可以被认为是有前途的全固态电池固体电解质。