What should be molten Lead Fluoride or Crayolite Contained In? (Best Crucible)

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The discussion revolves around the selection of crucibles for experiments involving molten Lead Fluoride and Crayolite in an electric muffle furnace. The initial inquiry highlights the high cost of platinum crucibles and questions the suitability of alumina crucibles. Graphite is suggested as a potential alternative, and while alumina theoretically could work due to its higher melting point, the maximum operating temperature of 1200°C is noted. The user aims to synthesize Corundum Crystals and seeks information on the compatibility of Zirconia crucibles with cryolite and graphite, expressing uncertainty about cryolite's ability to dissolve these materials. The conversation emphasizes the importance of researching material compatibility for successful experimentation.
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Hello,

I am willing to do some experiments with molten Lead Fluoride and Crayolite in an electric muffle furnace, but I am not sure what type of crucible to use? Platinum Crucibles are way too expensive and I am assuming Alumina Crucible is not suitable... so, are there any other alternatives?

Thank You.
 
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Have you tried graphite?

Alumina would work in theory, as it has a higher melting point than either cryolite or PbF2, but then again it depends on your maximum process temperature and what you're trying to accomplish.
 
Graphite seems like a good alternative... Thanks.

I am trying to synthesize Corundum Crystals. :)

This is a similar experiment:
http://www.sciencedirect.com/science/article/pii/0022024874904011

My maximum operating temperature will be below 1200 Celcius.

How about a Zirconia Crucible ?

Is cryolite able to dissolve Zirconia / Graphite like it does with Alumina? I couldn't find any phase diagrams online...

Thanks again. I highly appreciate your contributions.
 
This is why I like replying to threads - I always learn something!

I've never actually worked with cryolite, and hadn't looked into its usefulness. Not sure of it's compatibility with those materials and would have to research it myself.
 

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