w Microstructural studies on the reoxidation behavior of Nb-doped SrTiO3 ceramics

被引：10
作者：
Rahmati, B
Fleig, J [1 ]
Bischoff, E
Sigle, W
Maier, J
Rühle, A
机构：
[1] Max Planck Inst Solid State Res, Heisenberg Str 1, D-70569 Stuttgart, Germany
[2] Max Planck Inst Met Res, D-70569 Stuttgart, Germany
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2005年 / 25卷 / 12期
关键词：
perovskites; BaTiO3 and titanates; surfaces; defects; electron microscopy;
D O I：
10.1016/j.jeurceramsoc.2005.03.032
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：
We report several structural and chemical phenomena that were observed after high temperature annealing (1200 degrees C) of reduced 5 at.% Nb-doped polycrystalline SrTiO3 in oxygen. The oxidation led to the formation of islands on the surface which, depending on the surface orientation of the grains, exhibit characteristic shapes, densities, and lateral directions. A correlation between grain orientation and tendency towards island formation was found. Structure and composition of the islands and the bulk were investigated by transmission electron microscopy. The bulk interior of the oxidized SrTiO3 was found to exhibit compositional changes and Sr-rich secondary phases were found at the triple grain junctions. The results are discussed in terms of the defect chemistry of SrTiO3 (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2211 / 2214
页数：4
相关论文
共 16 条
[1]   NON-STOICHIOMETRY IN SRTIO3 [J].
CHAN, NH ;
SHARMA, RK ;
SMYTH, DM .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1981, 128 (08) :1762-1769
[2]  
DANIELS J, 1976, PHILIPS RES REP, V31, P489
[3]   SELF-COMPENSATION IN LANTHANUM-DOPED STRONTIUM-TITANATE [J].
EROR, NG ;
BALACHANDRAN, U .
JOURNAL OF SOLID STATE CHEMISTRY, 1981, 40 (01) :85-91
[4]   MICROSTRUCTURES OF SRTIO3 INTERNAL BOUNDARY-LAYER CAPACITORS DURING AND AFTER PROCESSING AND RESULTANT ELECTRICAL-PROPERTIES [J].
FUJIMOTO, M ;
KINGERY, WD .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1985, 68 (04) :169-173
[5]   STRUCTURES AND CHEMISTRY OF THE ANNEALED SRTIO3(001) SURFACE [J].
LIANG, Y ;
BONNELL, DA .
SURFACE SCIENCE, 1994, 310 (1-3) :128-134
[6]   High temperature oxygen sensors based on doped SrTiO3 [J].
Menesklou, W ;
Schreiner, HJ ;
Härdtl, KH ;
Ivers-Tiffée, E .
SENSORS AND ACTUATORS B-CHEMICAL, 1999, 59 (2-3) :184-189
[7]  
Meyer R, 2002, J ELECTROCERAM, V9, P103
[8]  
Moos R, 1997, J AM CERAM SOC, V80, P2549, DOI 10.1111/j.1151-2916.1997.tb03157.x
[9]  
NOGUERA C, 1996, PHYS CHEM OXIDE SURF, P42
[10]  
RAHMATI B, 2005, SURF SCI, V25, P2211, DOI DOI 10.1016/J.JEURCERAMSOC.2005.03.032
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