Accession Number:

AD0258252

Title:

RARE EARTH OXIDE SYSTEMS. PART II. THE INFRARED SPECTRA OF PRASEODYMIUM OXIDE AND PRASEODYMIUM CARBONATE

Descriptive Note:

Corporate Author:

PURDUE UNIV LAFAYETTE IND

Personal Author(s):

• FAETH,PAUL A.
• CLIFFORD,ALAN F.

Report Date:

1961-04-17

Pagination or Media Count:

1.0

Abstract:

Several samples of PrOx have been prepared which have x values between 1.50 and 1.83 by decomposing PrO1.83 in vacuo any x value could be prepared. The preparations were analyzed for infrared absorption activity in the region 2-16 microns. An absorption band at about 15 microns appeared for all samples if the specimens were permitted access to the atmosphere. No band appeared in this region if the samples were analyzed immediately after their preparation. Infrared analysis of samples of praseodymium carbonate and praseodymium hydroxide showed absorption activity in the same regions where activity was noted for air-exposed praseodymium oxide samples. It is concluded that the absorption band at 15 microns for the air-exposed oxides is due to hydration-carbonation effects. A sample of praseodymium carbonate was decomposed in vacuo and the spectrum of the resultant compound was observed. A differential thermal analysis of the carbonate in air showed that the dehydration probably is complete below 300 C. the carbonate loses CO2 at 470 C. and 630 C. and is subsequently converted to the oxide Pr6O11 near 400 C. Author

Descriptors:

• *CARBONATES
• *OXIDES
• *PRASEODYMIUM COMPOUNDS
• *RARE EARTH ELEMENTS
• ABSORPTION
• CHEMICAL BONDS
• CRYSTAL STRUCTURE
• DECOMPOSITION
• HYDROXIDES
• INFRARED RADIATION
• INFRARED SPECTROSCOPY

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE