 RFMI: Superconductor iron contamination issue
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Conundrum
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Fri Jan 14 2011, 06:02PM
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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
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Hi guys.
Does anyone have any ideas how I might go about purifying the superconducting precursors I have?
the problem seems to be the barium carbonate, as it is very low grade pyro material not 99.99999% pure mucho $$$ Alfa Aesar material.
my initial thought (thanks #hvcomm!) is to grow a crystal then grind that, hopefully removing most if not all of the problematic iron contamination.
BaCO3 is soluble in hydrochloric acid so its not impossible, just difficult.
EDIT:- soluble Ba salts are even more toxic than insoluble ones, best done in a fume hood etc.
As for testing it, one way might be to either do a test with YBCO (cheap and easy to make) and measure the Tc and Jc versus known examples.
Interestingly, the articles I can find suggest that if the oxygen doping is correct then even a powder (results of first firing) should generate a detectable effect at cryogenic temperatures.
Should save wasting kiln time on contaminated powder..
comments?
-A
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