EFFECT OF TEMPERATURE ON THE SYNTHESIS OF CERIUM CHALCOGENIDES
PITTSBURGH UNIV PA DEPT OF METALLURGICAL AND MATERIALS ENGINEERING
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The purpose of the investigation was to develop an isothermal study for the cerium-sulfur compositions synthesized over the temperature range of 600C to 1300C in 25 degree increments. Cerium sulfide compounds were synthesized under a carbon disulfide atmosphere from ceria CeO2 in a carbon combustion tube furnace. Wet chemistry results are documented for 35 cerium sulfide compounds prepared under isothermal conditions over the temperature range of 600C to 1300C. From the wet chemistry data, a partial binary diagram is proposed for the cerium-sulfur system. The amount of the oxide converted to sulfide for the 600C to 1300C temperature region is illustrated graphically. A limited amount of density data is presented in graphical form. X-ray diffraction data for the cerium sulfide compounds are tabulated. Cerium dissolves 25 per cent sulfur at 1300C and 27 per cent at 1115C, forming a Th3P4 type body-centered cubic structure. Complex X-ray diffraction spectra were obtained for the cerium sulfide compounds prepared below 1100C. From 950C to 1100C, two cubic phases were indexed as follows a body-centered cubic Ce3S4 type structure with an a sub o value of 8.65 A being the predominant phase, the second phase is simple cubic with an a sub o value of 8.85 A.
- Inorganic Chemistry
- Ceramics, Refractories and Glass