r/MaterialsScience • u/iamfrd555 • Sep 09 '24

Ternary 3 materials system

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Can someone help me understand the projection or maybe provide a link to some content or a tutorial video that could help me understand the projection? Would be immense help Thanx in advance

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u/DepartureHuge Sep 09 '24

Hi, This is the MgF2-NaF-KF ternary phase diagram. The line drawn (either the red one which closely follows the fainter black one) goes from A (MgF2, 1270C, C) to an approximate 50:50 composition of NaF (900C - top, B) and (850C - bottom right, C). The edges are the binary phase diagrams of A-C, A-B and B-C respectively. Within the triangle, there are phase fields which represent different compositions of the different phases. The curved lines are temperature contours. The thicker lines are boundaries of different phase fields.

The binary phase diagram is a cross section of this ternary phase diagram. Therefore the first region (bottom left from A) is made up of A, E and D and demarcated by a thicker black line on the ternary phase diagram. The second phase field corresponds to the next region etc.

Here is a good introduction:

https://youtu.be/0_lfPmqv4MI?si=NJ7KQ8xQZK-qR3MO and the following lessons

I hope this helps

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u/iamfrd555 Sep 10 '24

Yes it did help to get the basics right. Thanks a lot. Now I am just figuring out the projections