Synthesis, properties, sintering and microstructure of sphene, CaTiSiO{sub 5}: A comparative study of coprecipitation, sol-gel and combustion processes

Journal Article · Wed Apr 01 04:00:00 EST 1998 · Materials Research Bulletin

DOI:https://doi.org/10.1016/S0025-5408(98)00005-1· OSTI ID:616358

Muthuraman, M; Patil, K C ^[1]

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1. Indian Inst. of Science, Bangalore (India). Dept. of Inorganic and Physical Chemistry

Sphene (CaTiSiO{sub 5}), a titanosilicate ceramic considered as a host material for the immobilization of radioactive waste from nuclear power reactors, has been prepared using coprecipitation, sol-gel, and solution combustion methods. All these processes initially yielded amorphous powders, which on further calcination, crystallized to yield sphere along with perovskite, titania, and cristobalite. The coprecipitation-derived powder calcined at 1,000 C for 2 h showed the formation of single phase sphere; whereas, the sol-gel-derived and combustion-derived powders required higher temperature (1,200 C for 2 h) for single phase sphene to form. Coprecipitation-derived sphene powder achieved 96% theoretical density when sintered at 1,300 C for 2 h, and the microstructure of the sintered body showed a uniform grain size of {approx} 1 {micro}m.

• OSTI ID: 616358
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 4 Vol. 33; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
36 MATERIALS SCIENCE
COMBUSTION
COPRECIPITATION
GRAIN SIZE
MICROSTRUCTURE
RADIOACTIVE WASTE PROCESSING
SOL-GEL PROCESS
TITANITE
VITRIFICATION
WASTE FORMS