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PHASE EQUILIBRIA, KINETIC AND THERMODYNAMIC STUDIES OF SOME RARE EARTH AND OTHER METAL OXIDE AND NITRIDE SYSTEMS. Technical Progress Report on Project No. 5

Technical Report ·
OSTI ID:4156065
; ;
Continuation of studies on the phase relationships and the physical, thermodynamic, and high-temperature properties of oxide and nitride systems of the transition metals is reported. Equilibrium pressure measurements and x-ray diffraction, differential thermal anulysis, and thermogravimetric analysis are among the methods being used. Work in progress during the report period was centered around a study of oxidation kinetics of lanthanum, cerium, praseodymium, neodymium, samarium, gadolinium, and ytterbium. Results are tabulated on aspects such as the temperature region in which an activation energy was observed, the rate laws which were obeyed, activation energies, effects of reducing oxygen partial pressures, and effects on inert atmospheres. Preparations for studies of phases produced in the region between rare earth metals and their nitrides are reported. Data are also included on the infrared spectra of rare earth hydroxides, and onides which provide information on the type and intensity of the hydroxide bonding. A study of kinetics in high vacuum reduction or decomposition of mixed rare earth oxides is also being made. Preliminary investigations are being conducted to select the mixing agent from among ytterbium, erbium, and lutetium oxides. Papers for publication on the oxidation kinetics of cerium and lanthanum are included. (J.R.D.)
Research Organization:
Iowa. State Univ., Iowa City
NSA Number:
NSA-14-015629
OSTI ID:
4156065
Report Number(s):
TID-5914
Country of Publication:
United States
Language:
English

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Related Subjects

BEHAVIOR
BONDING
CERIUM
CHEMISTRY
DECOMPOSITION
DIFFRACTION
ERBIUM OXIDES
GADOLINIUM
HIGH TEMPERATURE
HYDROXIDES
INFRARED RADIATION
LANTHANUM
LUTETIUM OXIDES
NEODYMIUM
NITRIDES
OXIDATION
OXIDES
PHASE DIAGRAMS
PRASEODYMIUM
RARE EARTHS
REACTION KINETICS
REDUCTION
SAMARIUM
SPECTRA
THERMODYNAMICS
TRANSITION METALS
VACUUM
X RADIATION
YTTERBIUM