Substrate-free crystallization of distorted hexagonal barium titanate thin films

Stavitski, N.; Lyahovitskaya, V.; Nair, J.; Zon, I.; Popovitz-Biro, R.; Wachtel, E.; Feldman, Y.; Lubomirsky, I.
November 2002
Applied Physics Letters;11/25/2002, Vol. 81 Issue 22, p4177
Academic Journal
We show that substrate-free crystallized barium titanate (BaTiO[SUB3]) films adopt a hexagonal structure, whereas substrate-supported films assume the commonly observed tetragonal phase. However, in contrast to the known hexagonal BaTiO[SUB3], the substrate-free crystallized films demonstrate a small but measurable pyroelectric effect, and do not exhibit phase transitions in the 25-423 K temperature range. Thus the substrate-free crystallized BaTiO[SUB3] represents a heretofore unreported crystallographic modification of BaTiO[SUB3].


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