RARE EARTH OXIDE SYSTEMS. THE HYSTERESIS EFFECTS IN PRASEODYMIUM OXIDE

Journal Article · Mon Jul 01 04:00:00 EDT 1963 · Journal of Physical Chemistry (U.S.)

DOI:https://doi.org/10.1021/j100801a012· OSTI ID:4647539

Faeth, P A; Clifford, A F

The composition-- pressure diagram of the Pr- O system was studied between 10/sup -6/ and 150 mm oxygen pressure using a quartz beam microbalance. The isotherms between 400 and 500 deg show hysteresis between PrO/sub 1.80/ and PrO/sub 1.89/ as the pressure varies. At 465 deg a hysteresis loop extends over the entire pressure range. Everett's theory of hysteresis is compared to the Pr-- O isotherms at 465 deg . The seven theorems proposed by Everett are cited and discussed with reference to the Pr--O data. In general, the agreement between the properties of Everett's theoretical model of a domain system and the properties of the Pr-O system is good. Results of a preliminary study of the region between loop boundaries indicate that more than two domain states are present. 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 1.89/ and PrO/sub 1.80/. The domains change composition as a function of the oxygen pressure. (auth)

• Research Organization: Purdue Univ., Lafayette, Ind.
• Sponsoring Organization: USDOE
• NSA Number: NSA-17-037196
• OSTI ID: 4647539
• Journal Information: Journal of Physical Chemistry (U.S.), Journal Name: Journal of Physical Chemistry (U.S.) Vol. Vol: 67; ISSN JPCHA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CHEMISTRY
DIAGRAMS
LABORATORY EQUIPMENT
MAGNETISM
MEASURED VALUES
OXIDES
PRASEODYMIUM OXIDES
PRESSURE
QUANTITY RATIO
QUARTZ
RARE EARTHS
TRACE AMOUNTS
WEIGHT