rubberthinking,You wrote, barium anyone? and they spell it silicon.....just reminding myself....I don't have much to add about barium. It's a fairly common material in that it's mined and used in some commercial applications. It's not nearly as common or inexpensive as silicon of course, which is more than 1/4th of the earth's crust. I'm not sure how much silicon is actually used by the semiconductor industry at the moment; but I'm sure it's the most heavily used materials, given that it's used in the substrate.I suppose the use of barium might be plausible. Did your friend say what made it so interesting? A quick Google search doesn't give me many interesting leads ... or perhaps too many to follow them all, depending on what you search for.- Joel
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