首页> 外文OA文献 >Synthesis, structure and ionic conductivity in scheelite type Li(0.5)Ce(0.5-x)Ln(x)MoO(4) (x=0 and 0.25, Ln = Pr, Sm)
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Synthesis, structure and ionic conductivity in scheelite type Li(0.5)Ce(0.5-x)Ln(x)MoO(4) (x=0 and 0.25, Ln = Pr, Sm)

机译:白钨矿型Li(0.5)Ce(0.5-x)Ln(x)MoO(4)(x = 0和0.25,Ln = Pr,Sm)的合成,结构和离子电导率

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摘要

Scheelite type solid electrolytes, Li(0.5)Ce(0.5-x)Ln(x)MoO(4) (x = 0 and 0.25, Ln = Pr, Sm) have been synthesized using a solid state method. Their structure and ionic conductivity (a) were obtained by single crystal X-ray diffraction and ac-impedance spectroscopy, respectively. X-ray diffraction studies reveal a space group of I4(1)/a for Li(0.5)Ce(0.5-x)Ln(x)MoO(4) (x = 0 and 0.25, Ln = Pr, Sm) scheelite compounds. The unsubstituted Li0.5Ce0.5MoO4 showed lithium ion conductivity similar to 10(-5)-10(-3) Omega(-1)cm(-1) in the temperature range of 300-700 degrees C (sigma = 2.5 x 10(-3) Omega(-1) cm(-1) at 700 degrees C). The substituted compounds show lower conductivity compared to the unsubstituted compound, with the magnitude of ionic conductivity being two (in the high temperature regime) to one order (in the low temperature regime) lower than the unsubstituted compound. Since these scheelite type structures show significant conductivity, the series of compounds could serve in high temperature lithium battery operations.
机译:使用固态方法合成了Scheelite型固体电解质Li(0.5)Ce(0.5-x)Ln(x)MoO(4)(x = 0和0.25,Ln = Pr,Sm)。它们的结构和离子电导率(a)分别通过单晶X射线衍射和交流阻抗谱获得。 X射线衍射研究显示Li(0.5)Ce(0.5-x)Ln(x)MoO(4)(x = 0和0.25,Ln = Pr,Sm)白钨矿化合物的I4(1)/ a空间群。未取代的Li0.5Ce0.5MoO4在300-700摄氏度(sigma = 2.5 x 10)的温度范围内显示的锂离子电导率类似于10(-5)-10(-3)Omega(-1)cm(-1) (-3)在700摄氏度下为Ω(-1)cm(-1)。与未取代的化合物相比,取代的化合物显示出较低的电导率,离子电导率的幅度比未取代的化合物低两个(在高温状态下)至一个数量级(在低温状态下)。由于这些白钨矿型结构显示出显着的导电性,因此该系列化合物可用于高温锂电池操作。

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