EXAFS study of dopant segregation (Zn, Nb) in nanocrystalline anatase (TiO2)

被引：49

作者：

Bouchet, R

Weibel, A

Knauth, P ^{[1
]}

Mountjoy, G

Chadwick, AV

机构：

[1] Univ Aix Marseille 1, CNRS, Ctr St Jerome, MADIREL,UMR 6121, F-13397 Marseille 20, France

[2] Univ Kent, Sch Phys Sci, Funct Mat Grp, Canterbury CT2 7NR, Kent, England

来源：

CHEMISTRY OF MATERIALS | 2003年 / 15卷 / 26期

关键词：

D O I：

10.1021/cm034640n

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Segregation of an acceptor (Zn) and a donor dopant (Nb) in nanocrystalline anatase was studied by EXAFS spectroscopy. Different dopant concentrations between 0.1 and 1 at. % were investigated, and similar results were found for nanocrystalline powders and nanocrystalline ceramics made by hot-pressing the powders. Niobium did not segregate whatever the concentration, whereas zinc segregation was found above 0.1 at. %. These results can be interpreted based on defect thermodynamics, in the framework of a space charge segregation model.

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页码：4996 / 5002

页数：7

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