THE SOLID STATE CHEMISTRY OF RARE EARTH OXIDES. Technical Progress Report

Technical Report · Thu Jul 12 04:00:00 EDT 1962

OSTI ID:4818737

Eyring, L; Holmberg, Bo; Hyde, B; Kokoropolous, P; Felmlee, T

Rate studies of the oxidation of Pr/sub 6/O/sub 11/ to PrO/sub 2/ by oxygen gas at one atmosphere, in the temperature range 234 to 314 deg C, and the vacuum reduction of PrO/sub 2/ to Pr/sub 6/O/sub 11/ in the temperature range 242 to 347 deg C are reported. The kinetics of both processes are analyzed and with minor modifications would appear to fit the equation for a phase- boundarycontrolled mechanism quite accurately over most of the composition range involved. Stable phases in the rare earth oxide systems are also reported and discussed. The structural interrelations between A, B, and C type sesquioxides and fluorite dioxides are pointed out, and the structural relation between the sequence of intermediate phases, in the CeO/sub x/, PrC/sub x/, and TbO/sub x/ systems, and the sesquioxides and dioxides are considered. A parallel hypothetical homologous series of general formula M/sub n/O/sub 2n-1/ is suggested. (P.C.H.)

• Research Organization: Arizona State Univ., Tempe
• NSA Number: NSA-16-025323
• OSTI ID: 4818737
• Report Number(s): TID-16350
• Country of Publication: United States
• Language: English

Related Subjects

CALCIUM FLUORIDES
CERIUM OXIDES
CHEMICAL REACTIONS
CHEMISTRY
CONFIGURATION
FLUORITE
GASES
MINERALS
OXIDATION
OXYGEN
PRASEODYMIUM OXIDES
PRESSURE
QUALITATIVE ANALYSIS
RARE EARTHS
REACTION KINETICS
REDUCTION
SOLIDS
STABILITY
TEMPERATURE
TERBIUM OXIDES