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制备了化学计量比为RE2FeSb2(RE=Y,Dy,Er)新型Fe基合金电极.利用恒电流充放电方法测定了RE2FeSb2(RE=Y,Dy,Er)化合物的电化学性能,充放电循环表明RE2FeSb2(RE=Y,Dy,Er)具有2个明显放电平台;分别以3种RE2FeSb2(RE=Y,Dy,Er)合金电极为负极,以Ni(OH)2/NiOOH为正极构成的原电池,首次放电容量分别达到了715.8mAh/g,646.2mAh/g,673.6mAh/g,说明新型Fe基合金电极RE2 FeSb2(RE=Y,Dy,Er)具有很大的放电容量. 相似文献
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研究了La^3+、Li^1+取代对CaTiO3微波介电性能的影响。在1400℃以下烧结制备Ca1-xLa2x/3TiO3(简称CLT)微波陶瓷,分析了容差因子τ对谐振频率温度系数τf的影响。在1350℃烧结4h,可制备出εr=118,τf=+2.95×10^-4/℃,Qf=10360GHz的CLT(x=0.4)微波陶瓷。以(1叫)Ca0.6La0.2667TiO3-yLi1/2Nd1/2TiO3为代表,对(1-y)Ca1-xLa2x/3TiO3叫-yLi1/2Nd1/2TiO3(简称CLLNT)系列材料的微波介电性能进行了探讨。随着烧结温度的提高,CLLNT(x=0.4)的εr略有下降,而Q·f值略有上升。随着y值的增加,CLLNT(x=0.4)的即Q·f、τf都下降。与CLT(X=0.4)相比,虽然CLLNT(x=0.4)的Q·f值下降了,但τf得到较大的改善,同时ε仍很高,保持在100以上。 相似文献
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Alloys with composition of Ho6Fe23–xCox (x=0,1,3) were prepared and examined by X-ray diffraction technique and automatic battery testing instrument.The compounds Ho6Fe23–xCox (x=0,1,3) crystallized in cubic Th6Mn23-type structure with space group Fm 3m (No.225).The electrochemical properties of these alloys such as discharge capacity,cycling performance and high rate dischargeability were investigated by battery testing instruments in alkaline electrolyte.Substitution of small amounts of Co for Fe in Ho6Fe... 相似文献
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钛酸酯表面处理碳酸钙的研究 总被引:29,自引:2,他引:29
介绍了钛酸酯偶联剂表面处理碳酸钙的原理和方法。研究了表面处理后,碳酸钙填充性、碳酸钙/液体石蜡体系粘度的变化,以及钛酸酯用量、反应温度对表面处理效果的影响。测定了改性碳酸钙的红外光谱和差热曲线,并讨论了其在橡胶中的应用效果。 相似文献
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The Gd-Co-Mn alloys with compositions of Gd33.3Co66.7,Gd33.3Mn66.7,Gd22.2Co74.8Mn3 and Gd25Co70Mn5 were prepared and examined by X-ray diffractometer.The electrochemical properties of these alloys such as discharge capacity,cycling performance and high rate dischargeability were investigated by battery testing instruments in alkaline electrolyte.The discharge capacity of Gd22.2Co74.8Mn3 was the highest among these alloys at the same discharge current density,and the maximum value was 376.7 mAh/g discharged at 150 mA/g.The discharge capacities of the alloys Gd33.3Co66.7 and Gd33.3Mn66.7 reached their maxima(about 225 and 325 mAh/g)at discharge current density of 150 mA/g.A comparison of the electrochemical performance of the Gd-Co-Mn alloys revealed that the alloy Gd22.2Co74.8Mn3 possessed better electrochemical performance and had better discharge capacity,cycle stability,while the alloy Gd25Co70Mn5 had a better high rate discharge ability.In general,the electrochemical performance of ternary alloys was better than binary alloys in this case. 相似文献
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本文利用X射线衍射对Gd6Mn23-xNix(x=0.0,0.4,0.8,1.0,1.2,1.4)合金进行了研究,该合金属于立方晶系,为面心立方,具有Th6Mn23结构。随着Ni含量的增加谱线发生偏移,其点阵参数逐渐减少。用振动样品磁强计测定了合金的磁滞回线和磁化强度,剩余磁化强度和矫顽力。实验表明,剩余磁化强度,矫顽力Ho及磁损耗都非常低,较好地达到了软磁材料的性能要求。还研究了饱和磁化强度及磁化率随点阵参数及Ni含量的变化规律。 相似文献
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采用机械合金化方法,对Fe100-xWx(x=5,15,33.3,45,50,70,85,95)二元合金系统进行了机械合金化研究,用X射线衍射仪分析了球磨后的合金粉末的结构,用SEM对样品的形貌进行了分析.结果表明铁在钨中的固溶度大于30%;从理论上对Fe-W系统的固溶度进行计算,计算结果说明铁在钨中的固溶度与实验得到的结果相符. 相似文献