Equilibrium of intrinsic and impurity point defects in Ca-doped Sm2Zr2O7

被引：2

作者：

Vorotnikov, Vladimir A. ^{[1
,2
]}

Belyakov, Semyon A. ^{[3
]}

Ivanov, Alexey, V ^{[1
,2
]}

Novikova, Yulia, V ^{[3
]}

Stroeva, Anna Yu. ^{[1
]}

Grebenev, Vadim V. ^{[4
]}

Khmelenin, Dmitry N. ^{[4
]}

Emelyanova, Olga, V ^{[4
]}

Plekhanov, Maksim S. ^{[5
]}

Kuzmin, Anton, V ^{[1
,2
]}

机构：

[1] Vyatka State Univ, Inst Chem & Ecol, Kirov, Russia

[2] RAS, Inst Solid State Chem & Mechanochem SB, Novosibirsk, Russia

[3] RAS, Inst High Temp Electrochem UB, Ekaterinburg, Russia

[4] RAS, Shubnikov Inst Crystallog Fed Sci Res Ctr Crystall, Moscow, Russia

[5] Rhein Westfal TH Aachen, Inst Crystallog, Aachen, Germany

来源：

NANOSYSTEMS-PHYSICS CHEMISTRY MATHEMATICS | 2024年 / 15卷 / 01期

基金：

俄罗斯科学基金会;

关键词：

solid oxide electrolyte; pyrochlores; grain boundary conductivity; nanoscale powders; combustion method; THERMAL BARRIER COATINGS; OXYGEN-ISOTOPE EXCHANGE; IONIC-CONDUCTIVITY; ELECTRICAL-CONDUCTIVITY; GRAIN-BOUNDARY; LN(2)ZR(2)O(7) LN; RELAXATION-TIMES; WATER-UPTAKE; PYROCHLORE; ZIRCONATE;

D O I：

10.17586/2220-8054-2024-15-1-65-79

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this work, a doping strategy was used to achieve a good conductivity in samarium zirconate which crystallizes in the pyrochlore. The production of nanopowders made it possible to form high-density ceramics with an optimal microstructure. It is shown that intrinsic and impurity defects coexist in Sm2-xCaxZr2O7-delta, impairing ion transport at high doping levels. Despite this, Sm(1.95)Ca(0.05)Zr(2)O(7-delta )maintains low activation energy of the parent and has good ionic conductivity (10(-3) S center dot cm(-1) at 600 degree celsius) which is one of the largest among oxide pyrochlores. It has been shown to have a good chemical stability. The material has a thermal expansion coefficient (TEC) of 12 ppm K-1 which is higher than YSZ and provides better compatibility with electrode materials. The above makes it possible to successfully use it as a highly stable oxygen electrolyte or an intermediate thin layer at the electrolyte-electrode interface in electrochemical devices.

引用

页码：65 / 79

页数：15

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