Thin-layer dielectrics in the Pb[(Mg sub / 1/3 / Nb sub / 2/3 / ) sub 1 sub - sub x Ti sub x ]O sub 3 system

Thin layers of PMNT were prepared by spin casting alkoxide-based solutions on platinized Si. Depending on processing conditions, layers formed in a nonferroelectric pyrochlore phase (A sub 2 B sub 2 O sub 6 ) or in a ferroelectric perovskite phase (ABO sub 3 ). Dimensions of pyrochlore and perovskite unit cells increased with Mg and Nb contents. Rapid heat treatment between successive solution depositions minimized pyrochlore formation. Additions of benzoic acid affected the structure in solution and the later organic pyrolysis behavior from thin layers. 30 refs.