The phase equilibria relationships in the Na₃AlF₆-AlF₃-LiF ternary system have been investigated using a combination of quenching, optical microscopy, DTA, and x-ray powder diffraction techniques. The compatibility relations at 500°C, the binary system Na₃AlF₆-Li₃AlF₆, and the ternary liquidus surface were determined. The liquidus surface was found to contain the following five important invariant points:
1) eutectic - 81% LiF, 9.5% Na₃AlF₆, 9.5% AlF₃ and 685°C
2) eutectic - 56% LiF, 6% Na₃AlF₆, 38% AlF₃ and 585°C
3) eutectic - 37% LiF, 17% Na₃AlF₆, 46% AlF₃ and 620°C
4) peritectic - 30% LiF, 37% Na₃AlF₆, 33% AlF₃ and 660°C
5) reaction point - 65% LiF, 9% Na₃AlF₆, 26% AlF₃ and 675°C
The 500°C isothermal section contains 7 three-phase regions and 2 large two-phase regions. The binary system Na₃AlF₆-Li₃AlF₆ contained 2 incongruently melting compounds, many polymorphic transformations, and a eutectic at 690°C and 67 mole % Li₃AlF₆. / Master of Science
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/64717 |
| Date | January 1974 |
| Creators | Stinton, David Paul |
| Contributors | Ceramic Engineering |
| Publisher | Virginia Polytechnic Institute and State University |
| Source Sets | Virginia Tech Theses and Dissertation |
| Language | en_US |
| Detected Language | English |
| Type | Thesis, Text |
| Format | 56 leaves., application/pdf, application/pdf |
| Rights | In Copyright, http://rightsstatements.org/vocab/InC/1.0/ |
| Relation | OCLC# 21796885 |
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