Microstructure and electrical conductivity of alkaline elements doped apatite-type La10Si6O27 electrolytes

被引:13
作者
Feng, Yadi [1 ]
Dai, Lei [1 ,2 ]
Meng, Wei [1 ]
He, Zhangxing [1 ,2 ]
Li, Yuehua [1 ]
Wang, Ling [1 ,2 ]
机构
[1] North China Univ Sci & Technol, Coll Chem Engn, Tangshan 063009, Peoples R China
[2] Hebei Prov Key Lab Photocatalyt & Electrocatalyt, Tangshan 063009, Peoples R China
关键词
Lanthanum oxyapatite; Alkali elements doping; Electrical conductivity; Microstructure; OXIDE FUEL-CELLS; LANTHANUM SILICATES; IONIC-CONDUCTIVITY; SINTERING AID; LITHIUM-OXIDE; RARE-EARTH; CONDUCTORS; SR; BA; TRANSPORT;
D O I
10.1016/j.ceramint.2016.09.153
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Alkali elements doped lanthanum oxyapatites La(9.95)A(0.05)Si(6)O(26.95) (A=Li+, Na+, K+) are synthesized successfully by the solid state reaction. The structure, morphology and composition of La(9.95)A(0.05)Si(6)O(26.95) electrolytes are characterized by XRD, SEM and EDS, respectively. The electrical properties of La(9.95)A(0.05)Si(6)O(26.95) ceramics are investigated by electrochemical impedance spectroscopy (EIS). The results show that all the La(9.95)A(0.05)Si(6)O(27-delta) electrolytes consist of a single hexagonal apatite structure without impurity. The sinterability of apatite electrolytes is improved by the alkali elements doping and the densification sintering of the electrolytes can be achieved at 1550 degrees C. Among the alkali element doped samples, La(9.95)A(0.05)Si(6)O(26.95) exhibits the lowest activation energy for the electrical conduction and the highest conductivity of 1.12x10(-2) S cm(-1) at 800 degrees C.
引用
收藏
页码:289 / 295
页数:7
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