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The electrical resistivity of a hydrogenated LaNi5 thin film has been investigated as a function of temperature in vacuum and in hydrogen. While the film was heated in vacuum for the first time, the change in resistivity exhibited different characteristics during different ranges of temperatures due to the competition of two effects owing to the lattice scattering of conductive electrons and the number of them. The resistivity had a sharp drop near 600 K, which originates from the formation of high conducting lanthanum hydride and nickel due to a reaction between the dissolved hydrogen and LaNi5. The change in resistivity was not repeatable during the successive heating and cooling processes. When the film was heated under a hydrogen atmosphere, a drop in resistivity occurred near 700 K due to the reaction between LaNi5 and the hydrogen atmosphere. The film showed a linear temperature dependence of receptivity with completeness of the reaction. It was found that the reaction was irreversible. The film lost the ability of hydrogen absorption after the reaction, and it had a phase change from LaNi5 to LaH and Ni. This result was supported by X-ray diffraction patterns. 相似文献
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采用在周期性氧化电压信号中插入恒压波形的方法成功制备了具有缺陷模的一维氧化铝光子晶体. 这种晶体的透射光谱研究表明,缺陷的厚度对缺陷模的透过率具有显著影响,当缺陷厚度在180 nm时,光子禁带内部出现透过率为55%、半峰宽约为18 nm的缺陷模. 该缺陷模能够对进入到氧化铝孔道内部的液体物质做出响应,其位置与液体的折射率线性相关. 相似文献
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概括地介绍了近10年来葛庭燧教授领导的中国科学院固体物理研究所内耗与固体缺陷开放研究实验室在晶界力学弛豫方面所做的大量的创造性工作,其中包括确证了晶界力学弛豫的来源,发现了低频高温范围若干新的力学弛豫现象和非线性效应,在晶界弛豫与晶界结构的联系上得到一些极有价值的实验结果.这是继1947年葛庭燧教授发现晶界内耗峰以来我国科学工作者对线性和非线性内耗研究领域发展作出的新的重大贡献。 相似文献
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SIZE AND GRAIN-DISTRIBUTION EFFECTS IN ELECTRONIC PROPERTIES OF TWO-DIMENSIONAL NANOCRYSTALLINE RECTANGLE SYSTEMS
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According to the structural characters of real nanostructured systems, a model for two-dimensional nanostructured systems has been proposed. By developing a renormalization-group Green's function scheme, local electronic density of states at a type of crystallire sites is presented on the pure hopping model. It is found that the changes of all the grain-distribution rules, the average atomic number and the atomic interaction are connected with the spectral structures of nanostructured systems. However, bule shifts of the spectra of nanostruetured systems seem to be modulated mainly by the changes of the bond-parameters which are correlated with the lattice distortions of the nano-sized grains. 相似文献
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掺锌的TiO2纳米粉的结构相变及发光性质 总被引:32,自引:2,他引:30
采用溶胶-凝胶法制备了掺锌的TiO2纳米粉末,并用XRD、TEM、TG和DSC等技术考察了掺入的锌对TiO2的锐钛矿→金红石结构相变的影响.研究结果表明,锌的掺入可促进TiO2的结构相变,使相变温度显著降低.纳米态TiO2存在室温光致发光现象,在TiO2的纳米粉中掺入适量的锌,可显著增强体系的发光强度. 相似文献
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用化学镀方法在碳纳米管表面沉积了具有不同镍/钴成分配比的镍钴磷合金层.讨论了Co^2+与Ni^2+的浓度比、镀液温度、pH值对沉积速率的影响.并利用场发射扫描电镜、透射电镜、X射线衍射仪、能谱仪和磁性测疑仪对镍钴磷包覆碳纳米管进行了系统的结构和性能表征.结果表明:当镀液中Co^2+与Ni^2+的浓度比为1,pH值为9时沉积速率最大;镀液温度的升高会使沉积速率增大.磁性测试结果显示碳纳米管表面镀覆Ni—Co—P镀层后,其磁性能对镀层中的Ni、Co相对含量有强烈的依赖性.当Co^2+:Ni^2+=2:1时,饱和磁化强度最大.矫顽力分别在Co^2+:Ni^2+=1:2和Co^2+:Ni^+2+=4:1时有2个峰值;而磁导率分别在Co^2+:Ni^2+=1:4和Co^2+:Ni^2+=4:1时有2个峰值. 相似文献