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Temperature programmed oxygen evolution and electrical conductivity of a new series of fluorite compositions in La2-xPrxO3+y (1 <= x <= 2) system
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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 | ||||
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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 | ||||
Official Date: | 10 February 1999 | ||||
Dates: |
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Volume: | 13 | ||||
Number: | 4 | ||||
Number of Pages: | 8 | ||||
Page Range: | pp. 419-426 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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