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Phase Relations in Alkali Earth Flouride-Yttria Systems. 1. The CaF2-Y203 Phase Diagram.

PB196685

Publication Date	1970
Personal Author	Oden, L. L.; Sanker, P. E.; Babitzke, H. R.; Sumner, D. H.
Page Count	16
Abstract	The research was conducted for 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 CaF2-Y2O3 system for which solidus and liquidus temperatures and solid solubilities were determined. The information is presented as the phase diagram. 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 Y2O3 and 1,438 plus or minus 5C. The terminal solid solubility of Y2O3 in CaF2 decreases from 7 mole pct at 1,438C to 1 mole pct at 1,100C, and the solubility of CaF2 in Y2O3 decreases from 9.5 to 7 mole pct over the same temperature interval. (Author)
Keywords	Alkaline earth compounds Phase transformations Yttrium oxides Calcium fluorides Phase diagrams Halides Solubility Microstructure Slags Group 2A-7A compounds
Source Agency	Invalid Source Agency Code
NTIS Subject Category	99F - Physical & Theoretical Chemistry
Corporate Authors	BUREAU OF Mines, Washington, D.C.
Supplemental Notes	See also PB-196 686.
Document Type	Technical Report
Title Note	Rept. of investigations.
NTIS Issue Number	197105

Phase Relations in Alkali Earth Flouride-Yttria Systems. 1. The CaF2-Y203 Phase Diagram.

Phase Relations in Alkali Earth Flouride-Yttria Systems. 1. The CaF2-Y203 Phase Diagram.
PB196685

Publication Date	1970
Personal Author	Oden, L. L.; Sanker, P. E.; Babitzke, H. R.; Sumner, D. H.
Page Count	16
Abstract	The research was conducted for 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 CaF2-Y2O3 system for which solidus and liquidus temperatures and solid solubilities were determined. The information is presented as the phase diagram. 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 Y2O3 and 1,438 plus or minus 5C. The terminal solid solubility of Y2O3 in CaF2 decreases from 7 mole pct at 1,438C to 1 mole pct at 1,100C, and the solubility of CaF2 in Y2O3 decreases from 9.5 to 7 mole pct over the same temperature interval. (Author)
Keywords	Alkaline earth compounds Phase transformations Yttrium oxides Calcium fluorides Phase diagrams Halides Solubility Microstructure Slags Group 2A-7A compounds
Source Agency	Invalid Source Agency Code
NTIS Subject Category	99F - Physical & Theoretical Chemistry
Corporate Authors	BUREAU OF Mines, Washington, D.C.
Supplemental Notes	See also PB-196 686.
Document Type	Technical Report
Title Note	Rept. of investigations.
NTIS Issue Number	197105