摘要
报道了采用气相法对K7ZnBW11O39配合物进行Pr的化学热扩渗,研究了材料的电性能,并结合XPS等表征手段对其导电机理加以了初步的分析。通过配合物的TG DTA分析确定了扩渗温度,扩渗后材料的ICP分析测试表明,微量Pr可渗入到试样中。经XRD分析发现,扩渗后,化合物的晶型发生了改变,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,结果表明材料的导电性能发生了十分显著的变化,扩渗后试样的电导率为2.98×10-2S·cm-1,比扩渗前的电导率3.54×10-6S·cm-1提高了约104倍。XPS能谱及交流阻抗谱分析显示可能存在氧空穴导电。
The solidgas interface reaction of Pr with K7ZnBW11O39 in the gasphase chemistryheated permeation was reported for the first time. The permeated sample was charactered by ICP and the results show that minimum Pr can permeate into the body of K7ZnBW11O39. The analysis of XRD spectra finds that the structure of K7ZnBW11O39 has been destroyed and a new compound perhaps formed. The permeated sample was measured with fourelectrode method and AC impedance spectra, the data imply that its conductivity improves about 104 times at room temperature, reaches to 2.98×10-2 S·cm-1, which is a novel result. The analysis of XPS reveals the possibility of oxyanion hole conduction.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2002年第z3期75-78,共4页
Journal of the Chinese Society of Rare Earths
基金
黑龙江省重点攻关项目(GB02A301)
关键词
稀土
镨
杂多化合物
气相扩渗
导电性
XPS
rare earths
praseodymium
polyoxometalates
co-permeation
conductivity
XPS
