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以三氯化锑(SbCl3)和九水硫化钠(Na2S·9 H2O)为原料,以聚乙烯吡咯烷酮为表面活性剂,以乙二醇为辅助溶剂,在200℃温度条件下,采用溶剂热法成功制备了一维直径为80~190 nm,长度约为40μm的Sb2S3纳米棒材料,并对该合成材料进行碳包覆.将该合成材料作为钠离子电池负极材料时,表现出优异的储钠性能.对于Sb2S3/C电极,在电流密度为200 mA/g时,首次放电比容量为1019.2 mAh/g,循环50次后,比容量保持在566.8 mAh/g,当电流密度提高为500 mA/g时,循环100次后,比容量保持在480.4 mAh/g. 相似文献
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《电源技术》2015,(9)
采用真空熔炼及热压方法制备Ga和Na共掺杂Bi0.5Sb1.5Te3热电材料。利用X射线衍射(XRD)技术对样品的物相结构进行了表征。在300~500K测量温度范围内,共掺杂样品的Seebeck系数均低于Bi0.5Sb1.5Te3的Seebeck系数,并随着Ga掺杂量的增加,Seebeck系数逐渐减小。共掺杂使样品的载流子浓度增加,从而有效地提高了材料的电导率。所有共掺杂样品的热导率都大于Bi0.5Sb1.5Te3的热导率,在Na掺杂浓度不变的情况下,随着Ga掺杂浓度的增加,热导率逐步增加,Na0.04Bi0.5Sb1.46-xGaxTe3(x=0.12)样品具有高电导率的同时,Seebeck系数和热导率的损失不是很大,材料的热电性能得到了改善,在300~475K测量温度范围内的热电性能优值与Bi0.5Sb1.5Te3相比较均有所提高,325K时的最大ZT值为1.4。 相似文献
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采用水热法在FTO导电玻璃基底上,制备了一维有序的TiO_2纳米棒阵列。采用化学浴沉积方法在TiO_2纳米棒有序阵列上沉积Sb_2S_3纳米粒子,形成壳核式Sb_2S_3/TiO_2复合纳米棒阵列结构。通过控制化学浴的沉积时间,可以得到不同厚度Sb_2S_3纳米粒子壳层。通过电子扫描电镜(SEM)、X射线衍射(XRD)、能谱分析(EDS)、以及紫外-可见漫反射吸收光谱(UV-Vis DRS)等对样品形貌、结构组成以及光性能进行了测定和分析。最终基于P3HT/Sb_2S_3(3 h)/TiO_2为光电极所组装的杂化太阳电池能量转换效率最高,获得了1.15%的能量转换效率。 相似文献
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采用原位复合法制备磁性纳米复合纤维,利用造纸工艺抄造成磁性纸张.考察了二价铁离子(Fe2 )浓度、聚乙烯亚胺(PEI)助剂的用量、反应温度、熟化时间及搅拌速度等因素对磁性粒子(Fe3O4)填充量的影响.采用X射线衍射仪(XRD)和振动样品磁强计(VSM)对磁性纸张的结构及性能进行表征.实验结果表明,合成的磁性粒子为Fe3O4,并成功地沉淀在纤维上.通过实验可确定出最佳制备工艺条件:Fe2 浓度为0.06mol/L、PEI与纤维质量比为2%、反应温度为60℃、熟化时间为60min、搅拌速度为1000r/min.磁性能测试结果表明制备的磁性纸张具有超顺磁性. 相似文献
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通过对比实验方法研究了机器人铅酸电池Pb-Sb合金的胞/枝晶转变和电化学行为。采用EIS、极化曲线和等效电路分析研究了定向水冷凝固系统制备Pb-2.2%(质量分数)Sb合金试样在室温条件下H_2SO_4溶液中的腐蚀抗性。研究结果表明,胞状组织Pb-2.2%(质量分数)Sb电流密度为树枝晶组织的1/3。Pb-2.2%(质量分数)Sb合金比Pb-1%(质量分数)Sb和Pb-6.6%(质量分数)Sb合金的电流密度低,具有作为铅酸电池正极格栅的应用潜力。低冷却速率(0.6℃/s)的传统铸造工艺可获得粗的胞晶间距,从而获得良好的电化学腐蚀抗性,适用于制备Pb-2.2%(质量分数)Sb合金格栅。 相似文献
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采用控电位电沉积技术以不锈钢和金为基体制备了Bi2Te3-ySey温差电材料薄膜。通过环境扫描电子显微镜(ESEM)、能量散射光谱(EDS)、X射线衍射光谱法(XRD)等方法,研究了不同基体对Bi2Te3-ySey温差电材料薄膜形貌、组成及结构的影响。结果表明,在含有Bi3 、HTeO2 和Se4 的溶液中,可实现铋、碲、硒三元共沉积,制备出Bi2Te3-ySey温差电材料薄膜。以金为基体电沉积的Bi2Te3-ySey薄膜的表面较平整、致密。在-0.04V沉积电位下,以不锈钢和金为基体电沉积Bi2Te3-ySey薄膜组成分别为Bi2Te2.39Se0.77和Bi2Te2.45Se0.85,且在不锈钢上电沉积制备的Bi2Te3-ySey薄膜的塞贝克系数更高,为-60mV/K。 相似文献
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ABSTRACT Thin films based on Ge–Sb–Te are the most popular material for non-volatile phase change memory, because this material is more stable in the over-write than other chalcogenide alloy. We fabricated the Ge-doped Sb2Te3 rhombohedral thin films by metal-organic chemical vapor deposition (MOCVD) with bubbler type systems for the nonvolatile PCRAM applications and also expected the effects of ratio of respective precusors pressure. In spite of the different Ge bubbler temperature, all thin films have same crystallinity of Sb2Te3 phase, which has c-axis orientation perpendicular to the substrates. Even though ratio of relative Ge vapor pressure (%) increases up to 63%, amount of Ge in the films is only about 0.4%. We concluded that reaction between Sb and Te are dominant than other reaction such as Ge–Te or Ge–Sb in current conditions. Also, to improve the reaction of Ge elements in the chamber, controlling amount of Ge precursors may be needed delicately. These results suggest that Ge–Sb–Te thin films can be deposited by metal organic CVD for phase change memory applications. 相似文献
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在阐述Bi2Te3基本特性的基础上,分别介绍了掺杂Se、TeI4、RE、SiC对BiTe材料热电性能的影响;介绍了BiTe基合金的制备技术。通过结构的优化、组分的调整及制备技术的改进,可以进一步提高材料的热电性能。 相似文献
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In this study, the correlation between the electrical properties and crystalline phases of ZnO-Bi2O3 based varistor ceramics with rare earth additives was investigated. The additives used were in the form R2O3, where R represents Eu, Ho, Y, Er, Yb, or Lu. It was found that the incorporation of rare earth additives led to an increase in the varistor voltage in the nonlinear region, an increase in the leakage current in the pre-breakdown region, and a reduction in the limiting voltage in the upturn region. In the sample with added Y2O3, a phase referred to as the R-phase, which contained Y, Bi, Sb, Zn, Mn, and O, was observed to be homogeneously distributed at ZnO grain boundaries. X-ray diffraction analysis revealed that the amount of the Zn-Sb-O spinel and Bi-Cr-O phases present was reduced by the rare earth addition, and that rare earth elements were incorporated into a common crystalline phase. It is suggested that the formation of the R-phase at ZnO grain boundaries and the reduction in the Bi2O3 liquid phase during the sintering process might be responsible for suppressing ZnO grain growth, thus leading to an increase in the varistor voltage. 相似文献
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用硝酸盐热分解方法制备的以CuO为主体含13种金属氧化物的系列复合陶瓷,室温下的电阻率与组成及烧结时间有明显的相关性.当组成(CU:Ca:Sr:Ba:Bi:Pb:Ce:La:Sb:Fe:Zn:Ti:Cr)为3:2:2:2:1:1:0.20:0.60:0.25:0.50:0.50:0.25:0.75(mol:mol)时,陶瓷具有良好的绝缘性能. 相似文献