Abstract
Orientation of crystallites in (Bi,La) 4 Ti 3 O 12 (BLT) thin films were successfully controlled by adding such silicates and germanates as Bi 2 SiO 5 , ZrSiO 4 and La 2 GeO 5 . The ferroelectric films were formed by spin-coating mixed sol-gel solutions of BLT and silicate or germanate on a Pt/Ti/SiO 2 /Si structure. It was found from XRD analysis that the preferred orientation of crystallites in the BLT films was changed by the additives. That is, the orientation of crystallites in a Bi 2 SiO 5 -added BLT film was random, while it was almost perfectly c-axis-oriented in La 2 GeO 5 -added BLT and it was strongly (117)-oriented when ZrSiO 4 was added to BLT. It was also found that the remnant polarization and coercive field changed reflecting these different orientations.
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