Oxygen isotope exchange in doped lanthanum zirconates

被引：12
|
作者：
Farlenkov, Andrei S. [1 ,2 ]
Ithodimchuk, Anna V. [1 ,2 ]
Eremin, Vadim A. [1 ,2 ]
Tropin, Evgeniy S. [1 ,2 ]
Fetisov, Andrei V. [3 ]
Shevyrev, Nikita A. [1 ,2 ]
Leonidov, Ivan I. [1 ,2 ]
Ananyev, Maxim V. [1 ,2 ]
机构：
[1] Ural Fed Univ, Ekaterinburg 620002, Russia
[2] Inst High Temp Electrochem, Akad Skaya 20, Ekaterinburg 620990, Russia
[3] UB RAS, Inst Met, Ekaterinburg 620016, Russia
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2018年 / 268卷
基金：
俄罗斯科学基金会;
关键词：
Lanthanum zirconate; Pyrochlore; Oxygen surface exchange; Oxygen tracer diffusion; Segregation; Isotope exchange; Raman spectroscopy; XPS; EBSD; RARE-EARTH TITANATES; PYROCHLORE STRUCTURE; ELECTRICAL-CONDUCTIVITY; PROTONIC CONDUCTION; VIBRATIONAL-SPECTRA; INTERPHASE EXCHANGE; LATTICE-DYNAMICS; WATER-UPTAKE; DIFFUSION; ER;
D O I：
10.1016/j.jssc.2018.08.022
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The interaction between oxygen in the gas phase and La2-xCaxZr2O7-alpha (x = 0; 0.05; 0.1) with a pyrochlore structure was studied by the isotope exchange method with the gas phase equilibration in the temperature range of 600-900 degrees C and the oxygen pressure of 1.01 kPa. The oxygen diffusion and oxygen surface exchange coefficients were calculated for the investigated oxides. The rate-determining stage of the oxygen surface exchange kinetics for La1.9Ca0.1Zr2O7-alpha was found to be different from that for La1.95Ca0.05Zr2O7-alpha and La2Zr2O7-alpha. The influence of the calcium content in La2-xCaxZr2O7-alpha (x = 0; 0.05; 0.1) oxides on the heterogeneous exchange rates and oxygen tracer diffusion coefficients were discussed.
引用
收藏
页码：45 / 54
页数：10
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