Influence of europium doping on conductivity of LiNiPO_4  

Eu掺杂对LiNiPO_4导电性的影响(英文)

作　　者：M.PRABU S.SELVASEKARAPANDIAN A.R.KULKARNI S.KARTHIKEYAN C.SANJEEVIRAJA 

机构地区：[1]Department of Metallurgical Engineering and Material Science,Indian Institute of Technology Bombay,Mumbai,India [2]Department of Physics,Kalasalingam University,Krishnankoil-626126,Tamilnadu,India [3]School of Advanced Sciences,VIT University,Vellore 632014,Tamilnadu,India [4]Department of Physics,Alagappa University,Karaikudi-630003,Tamilnadu,India

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第2期342-347,共6页中国有色金属学报（英文版）

摘　　要：Europium doped LiNiPO4 and undoped LiNiPO4 were prepared by Pechini method. Compound formation temperature was confirmed from thermogravimetry and differential thermal analysis （TG/DTA）. Powder X-ray diffraction （XRD） pattern confirmed the formation of pure LiNiPO4 compound with an orthorhombic structure. The conductivity and modulus analyses of the samples were carried out at different temperatures and frequencies using the complex impedance spectroscopy technique. The conductivity parameters such as ion hopping frequency and the charge cartier concentration term were calculated using Almond and West formalisms. An increase of one order of magnitude in the ionic conductivity has been observed for 1.0% Eu-doped LiNiPO4. （mole fraction）. The complex modulus studies suggest the presence of non-Debye type of relaxation in the materials.采用Pechini方法制备了掺杂Eu和未掺杂Eu的LiNiPO4化合物,通过热重分析和差热分析(TG/DTA)来确定LiNiPO4的生成温度。粉末X射线衍射谱证实所得到的化合物为具有正交结构的纯LiNiPO4。采用复合阻抗谱技术分析样品在不同的温度和频率下的电导率和模量谱。采用Almond和West公式计算导电性能参数,如离子跃迁频率、电荷载体浓度。掺杂1.0%Eu的LiNiPO4的离子电导率增加了一个数量级。电模量谱分析表明LiNiPO4化合物中存在非德拜类型的弛豫。

关 键 词：LiNiPO4 ionic conductivity impedance spectroscopy DOPING HOPPING 

分 类 号：O614.111[理学—无机化学]