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首页> 外文期刊>Crystal growth & design >Unique Growth Manner of Li5La3Ta2O12 Crystals from Lithium Hydroxide Flux at Low Temperature
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Unique Growth Manner of Li5La3Ta2O12 Crystals from Lithium Hydroxide Flux at Low Temperature

机译：氢氧化锂助焊剂在低温下独特生长Li5La3Ta2O12晶体的方式

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摘要

Garnet-type Li(5+x)Ln(3)M(2-y)(IV)M(y)(V)O(12+z) (x, y = 0-2, z = 0-1; Ln = La, Pr, Nd; M = Ta, Zr, Nb) compounds are promising Li-ion conducting solid electrolytes, but their growth manner is still unclear. Herein, the analysis of the low-temperature growth of idiomorphic Li5La3Ta2O12 single crystals as a function of holding temperature and time, cooling rate, flux type, and solute concentration revealed a unique growth manner. Li5La3Ta2O12 crystals were grown at 500 degrees C from LiOH flux and transformed into Li7La3Ta2O13 at 700 degrees C. The pseudo-perovskite-type LiLa2TaO6 phase, initially formed during the holding at 500 degrees C, was efficiently transformed into the Li5La3Ta2O12 phase with increasing holding time. The growth of Li5La3Ta2O12 single crystals was independent of the cooling rate but was affected by the kind of flux and solute concentration. A low solute concentration (1 or 5 mol %) was the key to obtain well-dispersed and idiomorphic single crystals. The optimum growth conditions involved a holding temperature of 500 degrees C, a solute concentration of 1 or 5 mol %, and a holding time of 10 h. These findings indicate that formation and growth of Li5La3Ta2O12 single crystals are not only controlled by a general flux growth process but also involve chemical reactions between solutes and LiOH flux. Finally, high-resolution transmission electron microscopy image and selected area diffraction pattern highlighted products with high crystallinity and well-developed {110} and {211} facets.
机译：石榴石型Li（5 + x）Ln（3）M（2-y）（IV）M（y）（V）O（12 + z）（x，y = 0-2，z = 0-1; Ln = La，Pr，Nd; M = Ta，Zr，Nb）化合物是有前途的锂离子导电固体电解质，但其生长方式尚不清楚。在这里，对同构Li5La3Ta2O12单晶的低温生长的分析是其保温时间和时间，冷却速率，助熔剂类型和溶质浓度的函数，揭示了一种独特的生长方式。 Li5La3Ta2O12晶体从LiOH助熔剂在500摄氏度下生长，并在700摄氏度转化为Li7La3Ta2O13。最初在500摄氏度保持期间形成的准钙钛矿型LiLa2TaO6相随着保持时间的延长而有效地转变为Li5La3Ta2O12相。 。 Li5La3Ta2O12单晶的生长与冷却速率无关，但受助熔剂种类和溶质浓度影响。低溶质浓度（1或5 mol％）是获得分散良好且独特的单晶的关键。最佳生长条件包括保持温度为500摄氏度，溶质浓度为1或5 mol％，保持时间为10小时。这些发现表明，Li5La3Ta2O12单晶的形成和生长不仅受一般的助熔剂生长过程控制，而且还涉及溶质和LiOH助熔剂之间的化学反应。最后，高分辨率透射电子显微镜图像和选定的区域衍射图突出了具有高结晶度和发达的{110}和{211}面的产品。

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