| http://www.w3.org/ns/prov#value | - Preferably, the single-crystal has a volume of greater than about 1 cm.sup.3, such as greater than 2 cm.sup.3, such as greater than about 5 cm.sup.3, such as greater than about 10 cm.sup.3, such as greater than about 20 cm.sup.3,such as greater than about 30 cm.sup.3, such as greater than about 40 cm.sup.3.
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