RARE EARTH OXIDE SYSTEMS. PART II. THE INFRARED SPECTRA OF PRASEODYMIUM OXIDE AND PRASEODYMIUM CARBONATE
Several samples of PrO/sub x/ were prepared which have x values between 1.50 < x < 1.83; by decomposing PrO/sub 1//sub .//sub 8//sub 3/ in vacuo any x value could be prepared. The preparations were analyzed for infrared absorption activity in the region of 2 to 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 was concluded that the absorption band at 15 microns for the airexposed oxides is due to hydration-carbonation effects. The band is probably indicative of a metal-oxygen bond as proposed by Meloche for oxide systems; the band might also be due to a (chemi) sorbed species (CO/sub 2/ or H/sub 2/O). 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 deg C; the carbonate loses CO/sub 2/ at 470 deg C and 630 deg C and is subsequently converted to the oxide Pr/sub 6/O/sub 1//sub 1/ near 400 deg C. (auth)
- Research Organization:
- Purdue Univ., Lafayette, Ind.
- NSA Number:
- NSA-15-022181
- OSTI ID:
- 4047540
- Report Number(s):
- AFOSR-724
- Country of Publication:
- United States
- Language:
- English
Similar Records
THERMAL DECOMPOSITION OF FIVE SALTS OF PRASEODYMIUM, NEODYMIUM, AND SAMARIUM
THE OXIDATION OF PRASEODYMIUM OXIDE. PART I. CHEMISORPTION ON PRASEODYMIUM OXIDE