| http://www.w3.org/ns/prov#value | - The heating step(s) may occur, for instance, at a temperature of from about 500??? C. to about 2400??? C., in some embodiments from about 700??? C. to about 1500??? C., and in some embodiments from about 900??? C. to about 1200??? C. Likewise, the heating step(s) generally occur at a relatively low pressure, such as less than about 200 millitorr, in some embodiments less than about 100 millitorr,
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