La,Ce对Ge-W-Co多金属氧酸盐的气相扩渗及导电性研究  

Study on Rare Earth Co-Permeation and Conductivity of Complex K_6HCoGeW_(11)O_(40)

作　　者：李中华[1] 韦永德[1] 李昕[1] 周百斌[1] 郭元茹[1] 

机构地区：[1]哈尔滨工业大学应用化学系,黑龙江哈尔滨150001

出　　处：《中国稀土学报》2002年第z3期79-82,共4页Journal of the Chinese Society of Rare Earths

基　　金：黑龙江省重点攻关项目(GB02A301)

摘　　要：报道了采用多元渗的方法对K6HCoGeW11O40氧酸盐进行了稀土的气相扩渗。根据氧酸盐的TG DTA测试结果确定了稀土扩渗的温度,扩渗后的化合物经ICP分析测试表明,微量的La,Ce可渗入到试样中;对其XPS的测试结果证实La,Ce与氧酸盐中其他组分有键合作用;对比扩渗前后化合物的XRD谱图发现,扩渗前后化合物的衍射峰有明显的不同,预期得到了新的化合物。利用四电极法和交流阻抗法对扩渗前后样品的导电性能进行了测试,结果表明扩渗后试样的电导率比扩渗前的电导率提高了2.95×103倍。对扩渗后样品的变温交流阻抗谱分析显示,250℃时其导电类型发生了转变。Rare earth copermeation of K6HCoGeW11O40 was reported for the first time. The Copermeation temperature was decided by TGDTA and the ICP results of permeated sample indicate that La, Ce have permeated into the body of this compound. Results of XPS imply that chemical bonds exist between La, Ce and other components of this sample. The XRD patterns show great different between K6HCoGeW11O40 and permeated sample. Such result gives evident that the structure of K6HCoGeW11O40 destroyed and new compound perhaps formed. Fourprobe method and AC impedance spectra are used to measure the conductivities of K6HCoGeW11O40 and permeated complex, the values of conductivity, at room temperature, improve 2.95×103 times after being permeated. Analyses of AC impedance spectra of permeated compound at different temperatures show that current carrier changed.

关 键 词：稀土 多金属氧酸盐 多元渗 导电性 交流阻抗 

分 类 号：O632.4[理学—高分子化学]