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The eutectoid decomposition reaction that occurred in RECo5 phases ( RE=Dy and Gd ) at low temperature was discussed and confirmed by X-ray powder diffraction (XRD), differential thermal analysis, and scanning electron microscopy. The decomposition temperature of the GdCo5 and DyCo5 were identified as 805.8 and 900℃, respectively. The GdCo5 and DyCo5 phases could not be found in the isothermal section of Gd-Dy-Co ternary system at 800 K. Reasons for the absence of the RE2Co7 phase in the XRD patterns were discussed in detail. 相似文献
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研究在尿素-NaBr-KBr-甲酰胺体系中电沉积稀土-铁系金属(La-Co)合金.用扫描电子显微镜(SEM)观察金属镧钴合金镀层表面形貌,结果表明,金属镧钴合金镀层较疏松,有裂纹,呈现银灰色;X射线衍射(XRD)分析表明稀土金属镧钴合金为LaCo5晶体;特征X射线谱(EDS)证明镀层由金属镧、金属钴和极少量的氧化物、氯、溴组成,单质镧的含量为29.07wt%,单质钴的含量为63.51wt%;La和Co的原子数比值约为1:5;X射线光电子能谱(XPS)经Ar离子对样品表面层溅射后,测定结果进一步证明,沉积层确为单质镧和单质钴.着重研究了La-Co合金的磁性,发现在室温下呈现顺磁性的La,当与Co形成合金后饱和磁矩接近于磁性金属Co. 相似文献
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纳米AgPb18SbTe20热电材料的合成 总被引:1,自引:1,他引:0
采用水热法合成纳米AgPb18SbTe20热电材料,研究反应温度和时间对其物相和形貌的影响.所得颗粒用X射线粉末衍射仪和扫描电镜进行表征,结果表明,水热法合成的纳米AgPb18SbTe20颗粒具有NaCl型结构,粒子直径为20~50 nm,其反应温度越高,得到纯相AgPb18SbTe20所需时间越短,纳米粒子长得越大.采用水热法合成的AgPb18SbTe20热电材料具有纳米结构及不同形貌,对提高热电材料的热电优值系数有重要意义. 相似文献
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金属-类金刚石薄膜研究进展 总被引:1,自引:0,他引:1
类金刚石膜中的金属粒子可缓解类金刚石薄膜中由于制备态产生大内应力而导致的膜厚受限这一矛盾,能显著改变薄膜各种性能.述评了金属-类金刚石薄膜的制备工艺、不同金属粒子对DLC薄膜形态、键结构、力学及摩擦磨损性能、物理化学性能等的影响,指出在金属粒子对DLC膜的力学及摩擦学性能的影响方面还有很多待确定的因素. 相似文献
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X-rayPowderDiffractionDataandCrystalStructureofNiSbYZengLingmin,LiJunqin,ZhangLipingandZhuangYinghong(曾令民)(李均钦)(张丽萍)(庄应烘)(Ins... 相似文献
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Phase relationships in the Yb-Fe-Sb ternary system at 530℃ were investigated mainly by powder metallurgy and X-ray powder diffraction. Nine binary compounds (Yb6Fe23, Yb2Fe17, FeSb, FeSb2, YbSb2, YbSb, Yb11Sb10, Yb4Sb3, and αYb5Sb3) and one ternary compound (Fe4YbSb12) were confirmed in this system at 530℃. The homogeneity range of FeSb phase extended from approximately 43at.%Sb to 45at.%Sb, the maximum solid solubility of Sb in Fe phase and Yb in FeSb phase was approximately 3at.%Sb and 1at.%Yb at 530℃, respectively. Isothermal section of the phase diagram of the Yb-Fe-Sb ternary system at 530℃ consisted of thirteen single-phase regions, twenty-four two-phase regions, and twelve three-phase regions. 相似文献
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采用水热电沉积法在泡沫镍基体上原位沉积Co_9S_8薄膜,并对其形貌、组成、结构和电化学性能进行表征和测试。结果表明,镍基Co_9S_8薄膜呈花瓣片状,并具有优异的电化学性能,其在电流密度为10mA/cm~2时,比电容可高达2538.7 F/g。即使电流密度扩大至50 mA/cm~2时,比电容依然可达1930.7 F/g。经过1000次循环(电流密度为20 mA/cm2),比电容仍可达为1825.2 F/g,电容保有率72.8%,经过1500次循环后,电容保有率61.4%。 相似文献