Na_(2.5)Hf_(2-x)Ti_xSi_(1.5)P_(1.5)O_(12)系统快离子导体的阻抗谱

The Impedance Spectra Resolving and Fitting Analysis for Fast Ion Conductors in the Na_(2.5)Hf_(2-x)Ti_xSi_(1.5)P_(1.5)O_(12) System

系统地研究了Ｎａ２．５Ｈｆ２－ｘＴｉｘＳｉ１．５Ｐ１．５Ｏ１２快离子导体的阻抗谱，采用ＺＲＥＳ３．３程序对实测点进行解释和拟合计算，结果表明该系统呈良好的低温导电性。其中起始组成为Ｎａ２．５Ｈｆ１．８Ｔｉ０．２Ｓｉ１．５Ｏ１２的电导性最好．在４７３Ｋ时，其导电率σ４７３＝１．４７×１０－２（Ω·ｃｍ）－１，电导激活能Ｅａ＝ ２３．８６ｋＪ／ｍｏｌ．

The Na2.5Hf2-xTixSi1.5P1.5O12 system is synthesized from the mixture of Na3PO4-SiO2-HfO2-TiO2- (NH4)2HPO4 in a platinum vessel at the temperature of 1373.2-1473.2K for 20 hours. their impedance spectra are studied systemically. Resolving and fitting computation has been made on multicomponent impedance spectra of the fast ion sys- tem by means of ZRES3.3 PROGRAM. It turns out that the system is good low temperature coductors. The best is Na2.5Hf2-xTixSi1.5P1.5O12, its activation energy is 23.86 kJ / mol, and its conductivity 14.7× 10-2(Ω. cm)-1at 473.2K.