DISSOLUTION OF SINTERED THORIA

Technical Report · Sun Nov 01 04:00:00 EST 1959

OSTI ID:4103922

Farrell, M S

Thoria, prepared by calcining thorium oxalate and compacted and sintered, became increasingly more difficult to dissolvc in HNO/sub 3/ --HF mixtures as the sintering temperature was increased. The temperature of calcination of the oxalate is an important factor. Low calcination temperatures produced a more reactive thoria with a greater surface area. This thoria sintered more readily, producing denser compacts that had a smaller BET surface area and were more difficult to dissolve. Thoria produced by calcination at 600 deg C showed"mottling" when sintered at 1700 deg C. These dark-colored mottles dissolved much more slowly than the white matrix in which they were embedded. No material other than thoria was detected in an x-ray analysis of the mottled material. No extra lines or deformations were visible, and although interstitial carbon was suspected, no evidence for this was obtained. (auth)

• Research Organization: Australia. Atomic Energy Commission Research Establishment, Lucas Heights, New South Wales
• NSA Number: NSA-15-007311
• OSTI ID: 4103922
• Report Number(s): AAEC/E-42
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BET METHOD
CHEMISTRY
COLOR
DETECTION
HYDROFLUORIC ACID
MATRICES
NITRIC ACID
OXALATES
PREPARATION
SINTERING
SOLUTIONS
SURFACES
TEMPERATURE
THORIUM COMPOUNDS
THORIUM OXIDES
X RADIATION