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

页码：45 / 54

页数：10

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