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Nanoporous Ta 2 O 5 films with oriented and elongated nanopores have been prepared by a technique which utilizes the accumulation of free volume during the crystallization of amorphous Ta 2 O 5 annealed above 973K. The transmission electron microscopy analyses revealed that voids were elongated in the [100] direction perpendicular to the longitudinal b axis of the orthorhombic...
A high density of nanovoids between 2 and 13nm in size was produced during the crystallization process when amorphous Al 2 O 3 and WO 3 , which are 20–30% lower in density than their crystalline phases, were annealed. By contrast, no formation or growth of nanovoids was observed during the crystallization of amorphous TiO 2 , which has a density 2% lower than its crystalline...
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