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Phase relations in the alkaline earth fluoride-yttria systems (in three parts). 1. The CaF/sub 2/--Y/sub 2/O/sub 3/ phase diagram

Technical Report ·
OSTI ID:7209089
; ; ;
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 CaF/sub 2/--Y/sub 2/O/sub 3/ system for which solidus and liquidus temperatures and solid solubilities were determined. The information is presented as the phase diagram. All specimen compositions were blended from high-purity materials and encapsulated in Mo or Pt20Rh prior to heat treatment. Liquidus temperatures were determined by ceramographic examination of heat-treated and quenched specimens. Solidus temperatures were determined by differential thermal analysis and by electron microprobe analysis of quenched specimens. Terminal solid solubilities were derived by parametric methods. The peritectic system was found to be pseudobinary due to the formation of yttrium oxyfluoride at temperatures near the liquidus. The peritectic point occurs at 7 mole pct Y/sub 2/O/sub 3/ and 1,438/sup 0/ +- 5/sup 0/C. The terminal solid solubility of Y/sub 2/O/sub 3/ in CaF/sub 2/ decreases from 7 mole pct at 1,438/sup 0/C to 1 mole pct at 1,100/sup 0/C, and the solubility of CaF/sub 2/ in Y/sub 2/O/sub 3/ decreases from 9.5 to 7 mole pct over the same temperature interval.
Research Organization:
Bureau of Mines, Albany, OR (USA). Albany Metallurgy Research Center
OSTI ID:
7209089
Report Number(s):
BM-RI-7437
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
DIFFERENTIAL THERMAL ANALYSIS
ELECTRON MICROPROBE ANALYSIS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
MICROANALYSIS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
THERMAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES