RARE EARTH OXIDE SYSTEMS. PART I. A COMPARISON OF THE HYSTERESIS EFFECTS IN PRASEODYMIUM OXIDE AND EVERETT'S THEORY OF HYSTERESIS
The composition-pressure diagram of the Pr-- 0 system was studied at 10/ sup -5/ to 150 mm oxygen pressure using a quartz beam microbalance. The isotherms between 400 and 500-C show hysteresis between PrO/sub 1.8//sub 0/ and PrO/sub 1.8/ /sub 3/ as the pressure varies. At 465 deg C a hysteresis loop extends over the entire pressure range. Everett's theory of hysteresis is compared with the Pr--0 isotherms at 465 deg C. The seven theorems proposed by Everett are cited and discussed with reference to the Pr--0 data. In general the agreement between the properties of Everett's theoretical model of a domain system and the properties of the Pr--0 system is good. The behavior of the praseodymium oxide system is thought to be a result of its being composed of domains of various stable compositions such as PrO/sub 1.8//sub 3/, PrO/sub 1.8// sub 0/, and others. The domains change composition as a function of the oxygen pressure. (auth)
- Research Organization:
- Purdue Univ., Lafayette, Ind.
- NSA Number:
- NSA-15-017384
- OSTI ID:
- 4036571
- Report Number(s):
- AFOSR-549
- Country of Publication:
- United States
- Language:
- English
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