Temperature programmed oxygen evolution and electrical conductivity of a new series of fluorite compositions in La2-xPrxO3+y (1 <= x <= 2) system
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 0217-9792Full text not available from this repository.
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|
|Date:||10 February 1999|
|Number of Pages:||8|
|Page Range:||pp. 419-426|
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