Sol-gel derived ferroelectric Bi3.15Nd0.85Ti 3O12 thin films of predominant 100/010/119 orientation deposited both on Nb-doped (011)SrTiO3 and on (011)SrRuO 3/(011)SrTiO3

Abstract

Ferroelectric Bi3.15Nd0.85Ti3O 12 (BNdT) thin films of predominant 100/010/119 orientation were grown through a cheap and simple sol-gel process both on Nb-doped (011)SrTiO3 and on (011)SrRuO3/(011)SrTiO3. Using rapid heating rates during crystallization, films containing 28%∈(100)/(010)-oriented grains plus 19%∈(119)-oriented grains were obtained on SrRuO3/SrTiO3, while 30%∈(100)/(010)- and 18%∈(119)-oriented grains were obtained on Nb:SrTiO3. The films consist of columnar grains and 90° a-b domains exist in large BNdT grains. The BNdT thin films exhibit excellent ferroelectric and dielectric properties with a remanent polarization 2Pr=39.2 μC/cm2 and a dielectric constant εr=184.5. © 2008 Springer-Verlag.