Novel Y2-xPrxRu2O7 (x=0-2) Pyrochlore Oxides Prepared Using a Soft Chemistry Route and their Electrical Properties

被引：22

作者：

Abate, Chiara ^{[1
,2
]}

Esposito, Vincenzo ^{[2
]}

Duncan, Keith ^{[1
]}

Nino, Juan C. ^{[1
]}

Gattia, Daniele Mirabile ^{[3
]}

Wachsman, Eric D. ^{[1
,4
]}

Traversa, Enrico ^{[2
]}

机构：

[1] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA

[2] Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00133 Rome, Italy

[3] ENEA, Res Ctr Casaccia, Dept Phys Methods & Mat, I-00123 Rome, Italy

[4] Univ Maryland, Univ Maryland Energy Res Ctr, College Pk, MD 20742 USA

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2010年 / 93卷 / 07期

基金：

美国国家科学基金会;

关键词：

THICK-FILM RESISTORS; RUTHENIUM PYROCHLORES; FUEL-CELLS; TRANSITION; ELECTRODES; CATHODES; SPECTRA; ELECTROLYTES; PB2RU2O6.5; OXIDATION;

D O I：

10.1111/j.1551-2916.2010.03666.x

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：

Y2-xPrxRu2O7 (0 < x < 2) pyrochlore powders were prepared using a precipitation method, which allowed control of their composition and morphology. Materials structure and morphology were characterized by X-ray diffraction analysis and field emission scanning electron microscopy, respectively. All the synthesized powders exhibited a single pyrochlore phase with particle size depending on the Pr content. Powders with Pr content smaller than 25 mol% were nanometric. X-ray photoelectron spectroscopy analysis revealed a mixed oxidation state of both Pr and Ru, and a variation of the oxidation state of the elements in response to oxygen partial pressure changes. Electrical conductivity measurements were performed by dc 4-probe method at several temperatures, showing that increasing the Pr content in the A site of the pyrochlore structure increased the oxide electrical conductivity.

引用

页码：1970 / 1977

页数：8

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