TEMPERATURE-DEPENDENCE OF XANES IN CEO2-TB2O3.5 MIXED CONDUCTOR

被引：4

作者：

ARASHI, H

NAITOH, H

ISHIGAME, M

机构：

[1] Research Institute for Scientific Measurements, Tohoku University, Sendai

来源：

SOLID STATE IONICS | 1990年 / 40-1卷

关键词：

D O I：

10.1016/0167-2738(90)90065-Y

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：

XANES spectra of the L3 absorption edge of CeO2-Tb2O3.5 mixed conductors were measured. Two absorption peaks were observed at about 7.5 keV with an energy separation of 8.5 eV, which corresponded to the chemical shift of the rare-earth ions. From this experimental result, the co-existence of tetravalent and trivalent state ions in CeO2-Tb2O3.5 mixed conductor was confirmed. The decrease of the fraction of Tb4+ ions with increasing temperature was found from the temperature dependence of XANES spectra. This decrease of Tb4+ content explained the observed temperature dependence of electronic conduction from a small polaron model. © 1990.

引用

页码：539 / 543

页数：5

共 9 条

[1] INVESTIGATIONS OF VALENCE CHANGE OF TB IONS IN ZRO2-TB4O7 MIXED CONDUCTOR USING XANES MEASUREMENTS [J].

ARASHI, H ;

SHIN, S ;

MIURA, H ;

NAKASHIMA, A ;

ISHIGAME, M ;

SHIMOMURA, O .

SOLID STATE IONICS, 1989, 35 (3-4) :323-327

[2]

Esteva J. M., 1986, Journal de Physique Colloque, V47, P955, DOI 10.1051/jphyscol:19868183

[3]

Gouet M., 1981, High Temperatures - High Pressures, V13, P43

[4]

Iwahara H, 1988, ADV CERAM, V24, P907

[5] OXYGEN ION CONDUCTION OF FLUORITE-TYPE CE1-XLNXO2-X-2 (LN= LANTHANOID ELEMENT) [J].

KUDO, T ;

OBAYASHI, H .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1975, 122 (01) :142-147

[6]

Rohler J., 1984, EXAFS and Near Edge Structure III. Proceedings of an International Conference, P379

[7] SMALL POLARON ELECTRON-TRANSPORT IN REDUCED CEO2 SINGLE-CRYSTALS [J].

TULLER, HL ;

NOWICK, AS .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1977, 38 (08) :859-867

[8] ELECTRICAL-CONDUCTIVITY AND DEFECT CHEMISTRY OF THE SYSTEM (TBXGD1-X)2ZR2O7+Y(0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1-0-LESS-THAN-OR-EQUAL-TO-Y-LESS-THAN-0.25) [J].

VANDIJK, MP ;

DEVRIES, KJ ;

BURGGRAAF, AJ .

SOLID STATE IONICS, 1985, 16 (1-4) :211-224

[9]

Wong J., 1984, EXAFS and Near Edge Structure III. Proceedings of an International Conference, P49

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