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LaF3 superfine powder was synthesized from La(CH3COO)3 and NH4 F by microwave heating method,using ethanol or pure water as dispersants respectively. The results of XRD and SEM indicate that the superfine powder has high purity, regular particle shape and narrow distribution of granularity. The granularity of the best sample is in the range of 100 -200 nm. The influence of different dispersants on the crystal degree and microstructure was discussed. After the superfine powder was formed into a slice at pressure of 25 - 60 MPa, its electrochemical impedance spectroscopy was tested by electrochemical impedance spectroscopy (EIS) measurement. The result shows that the grain refining of LaF3 powder increases its ionic conductivity. Compared with traditional preparation methods of LaF3 powder, the advantages of microwave heating method were summarized. 相似文献
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温度导向法制备氟化镧掺杂单晶及其电导率的测定 总被引:1,自引:0,他引:1
采用温度下降法在实验室条件下制备了氟化镧{纯LaF3及掺杂(Sm,Eu,Ga)F3、CaF2的LaF3)单晶。用交流电桥法测定了20~100℃范围内这些单晶的离子导电率,得出其离子导电率在10^-6Scm^-1数量级。用交流阻抗谱的方法在100~400℃范围内、氩气保护下测定了氟化镧{LaF3掺杂1%(Sm,Eu,Ga)F3、2.05%CaF2}单晶及市售氟化镧{LaF3掺杂(0.2%EuF2、5%CaF)}单晶的阻抗谱,求得单晶离子电导率皆在10^-4Scm^-1数量级。 相似文献
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研究一种煤矿安全生产中用于复合式氧气瓶的低温固化环氧树脂胶粘剂,在以多亚乙基多胺为固化剂主料的基础上,调整流服、2—甲基咪唑、DMP—30用量,确定其最佳质量比为1.00:0.20:0.03:0.20,选择适宜的反应温度和时间,合成出完全符合实际需要的固化剂。使用该固化剂与环氧树脂及溶剂混配制胶,其固化时间小于7h,固化温度低于70℃,凝胶时间大于3h。该胶应用于气瓶缠绕粘接各项性能指标均能达到要求。 相似文献
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用LaF3(掺杂CaF2)小管作为固体电解质,分别以H2C2O4·2H2O、H2C2O4混合物和Na2SO4·10H2O、Na2SO4混合物作为参比电极,用已知水蒸气分压的纯水和KOH溶液作为工作电极,构成了两类固体电解质水蒸气浓差电池。分别在8~33℃和6~24℃温度范围内研究了电池电动势与温度的关系,得出了有规律性的结果。即电池的电动势随温度的升高而变小,在温度恒定的情况下,随工作电极水蒸气分压的增大而变大,在EMF和lg(PH2O(Ⅰ)PH2O(Ⅱ))之间有较好的线性关系,可望成为一种固体电解质型的新式湿度传感器。 相似文献