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Redox Reaction of Praseodymium Oxide in the ZnO Sintered Ceramics

โœ Scribed by Naoki Wakiya; Sung-Yong Chun; Kazuo Shinozaki; Nobuyasu Mizutani

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
194 KB
Volume
149
Category
Article
ISSN
0022-4596

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โœฆ Synopsis

The reason why Pr 2 O 3 remains stable in the ZnO sintered body in air through pure Pr 2 O 3 is only stable at high temperature was investigated using high-temperature XRD and thermogravimetry. The Pr 2 O 3 in the ZnO sintered body was not due to reduction by the metallic Zn in the intestitial site of ZnO as reported in the literature. The redox reaction of praseodymium oxide in the ZnO grains is strongly a4ected by the microstructure. The reduction temperature of PrO x with defect 6uorite structure upon heating is increased with the decrease of PrO x composition due to the decrease of open pores. On cooling, the oxidation of Pr 2 O 3 into PrO x is kinetically suppressed by the O 2 di4usion. In this way, Pr 2 O 3 remains stable in ZnO sintered ceramics.

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