Phase relations in the alkaline earth fluoride--yttria systems (in three parts). 3. The SrF/sub 2/--Y/sub 2/O/sub 3/ phase diagram and information on the SrF/sub 2/--SrO system

Technical Report · Tue Jan 01 04:00:00 EST 1974

OSTI ID:5378637

Oden, L L; Babitzke, H R; Sanker, P E

The Bureau of Mines is developing melting data for binary combinations of the alkaline earth fluorides and yttria to facilitate the formulation of slag compositions. The present report deals with the SrF/sub 2/-Y/sub 2/O/sub 3/ system for which liquidus and solidus temperatures and solid solubilities were determined. The information is presented as the phase diagram. The phase diagram was constructed from information obtained by ceramography, X-ray diffraction, thermal analysis, and electron probe microanalysis of small specimens encapsulated in platinum-20 percent rhodium or molybdenum ampoules. The data indicate a simple eutectic system with limited terminal solid solubilities. The eutectic temperature is 1,457/sup 0/ +- 5/sup 0/ C, and the eutectic composition is 4 +- 1 mole-pct Y/sub 2/O/sub 3/. Strontium fluoride containing up to 2 wt-pct O/sub 2/ was studied to determine the effects of oxygen contamination. Oxygen levels in excess of 0.2 wt-pct resulted in eutectic formation between SrF/sub 2/ and SrO. The eutectic composition is between 0.2 and 0.7 wt-pct O/sub 2/, and the eutectic temperature is 1,447/sup 0/ +- 5/sup 0/C.

• Research Organization: Bureau of Mines, Washington, D.C. (USA)
• OSTI ID: 5378637
• Report Number(s): BM-RI-7853
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
DIAGRAMS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
STRONTIUM COMPOUNDS
STRONTIUM FLUORIDES
STRONTIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES