UNSPECIFIED (1999) Temperature programmed oxygen evolution and electrical conductivity of a new series of fluorite compositions in La2-xPrxO3+y (1 <= x <= 2) system. INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 13 (4). pp. 419-426. ISSN 0217-9792

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Abstract

Temperature programmed oxygen evolution (TPD) and electrical conductivity of a new series of fluorite compositions in La2-xPrxO3+y (1 less than or equal to x less than or equal to 2) system have been investigated. For x = 2, oxygen evolution occurs at three distinct steps, whereas for x less than or equal to 1.8, oxygen evolution occurs only in two steps and for x = 1 it becomes negligible. A decrease in the Pr-content in the fluorite compositions lowers the TPD peak intensity. The samples resorb oxygen on annealing at 650 degrees C in flowing oxygen and cooling the samples to room temperature revealing the reversible oxygen uptake and release feature. The electrical conductivity increases as a function of Pr-content in this series. For x less than or equal to 1.8, the temperature dependent conductivity shows breaks at two temperature regions and the magnitude of the break is pronounced in Pr-rich compositions. Also, the activation energy decreases as the Pr-content is increased in this series. The present results suggest that the fluorite compositions in this system might have potential as catalysts to store/transport/release oxygen reversibly.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	INTERNATIONAL JOURNAL OF MODERN PHYSICS B
Publisher:	WORLD SCIENTIFIC PUBL CO PTE LTD
ISSN:	0217-9792
Date:	10 February 1999
Volume:	13
Number:	4
Number of Pages:	8
Page Range:	pp. 419-426
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/14553

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