Preparation and properties of highly c-axis oriented Sr_(0.6)Ba_(0.4)Nb_2O_6 thin films by the Sol-Gel process

摘要

Highly oriented ferroelectric strontium barium niobate (Sr_(0.6)Ba_(0.4)Nb_2O_6) thin films were prepared on P-type Si(100) substrate by the Sol-Gel process. The XRD patterns of the SBN films show that SBN film prepared by using NbCl_5, KOH as raw materials performed a highly c-axis preferred orientation perpendicular to the Si substrate, better than films that was prepared using Nb(OC_2H_5)_5 as starting agents. It may be duo to the existence of the potassium ion that not be filtered out completely during the preparation of the niobium alkoxide. The characteristics of D-F and C-V curves were obtained for SBN/Si film. The film exhibits high dielectric constant. In order to investigate ferroelectric characteristics further, the P-E loops of the SBN/Pt/Si were also measured. The films show better optical properties, transmittance of Sr_(0.6)Ba_(0.4)Nb_2O_6 films on MgO(001) and SiO_2 substrates was more than 60% at the range from 450 to 850nm, refractive index was measured to be 2.14 and 2.12 on the MgO and SiO_2 substrate at 633nm respectively.