Impossible Carbides
Some metals, such as lead and tin, are believed not to form carbides under any circumstances. There exists however a mixed titanium-tin carbide, which is a two-dimensional conductor. (In 2007, there were two reports of a lead carbide PbC2, apparently of the acetylide type; but these claims have yet to be published in reviewed journals.)
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“Still bent to make some port he knows not where,
Still standing for some false impossible shore.”
—Matthew Arnold (1822–1888)