YS和YbS的制备及其性质的研究

稀土元素是我国的丰产元素。稀土硫属化合物具有热电、铁磁和光电等性质。是一种很有前途的半导体材料。R·Didchenko和Gortsema报道,按化学计量比合成的YbS,当用硫掺杂时,过剩的硫使其成为P型半导体,具有能障0.33～0.36eV。稀土单硫属化合物的熔点高,合成困难,一般分两步进行。文献报道,在熔合的第一步,硫和稀土金属要分别放置,否则,将两     

Hydrogen Sensing Property of Lanthanum Complex Fluoride

Four potentiometric sensor cells have been prepared by using La_(0.95)Pb_(0.05)F_(2.95) as solidelectrolyte(SE) and various materials as electrodes.The sensor cell “Bi(BiF_3)|SE|Pt”exhibits the best per-formance with its 90% response time as short as 75 s to 100 Pa H_2 in air at room temperature and with itslinear decrease of electromotive force (EMF) with an increase of the logarithm of hydrogen partial pressure inthe experimental range.The sensor cell shows weaker response to CO.     

Nd_(0.5)Sr_(0.5)CoO_3热敏和气敏性质的研究

本文研究了稀土复合氧化物Ln_(0.5)Sr_(0.5)CoO_8(Ln=La,Nd)敏感材料的制备.用X-射线测定了它们的晶体结构,用电子扫描显微镜测定了它们的结晶粒度、孔隙度,并制成了敏感元件.测量了它们的热敏、气敏性质,计算了活化能,还讨论了烧结时间对结晶粒度和气敏性的相互影响.     

YBa_2Cu_3O_(7-y)的磁敏特性

本文使用YBa_2Cu_3O_(7-y)块试制了高T_c超导磁敏元件.研究了电极对磁敏元件输出的影响,及液氮温区磁敏元件的输出电压与磁场的关系.研究结果表明高T_c超导磁敏元件在弱磁场下有较高的灵敏度,有可能在弱磁场检测方面得到应用.