IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Electronics Monday Sessions
       Session EL-MoM

Paper EL-MoM3
Template Sol-Gel Synthesis and Characterization of BaTiO@sub 3@ Nanostructures

Monday, October 29, 2001, 10:20 am, Room 130

Session: Ferroelectric
Presenter: B.A. Hernandez, Colorado State University
Authors: B.A. Hernandez, Colorado State University
K.C. Chang, Colorado State University
E.R. Fisher, Colorado State University
P.K. Dorhout, Colorado State University
Correspondent: Click to Email
Barium titanate in both its cubic and tetragonal form has shown relevance in many applications. A high dielectric constant, ferroelectric behavior, and electro-optical properties make this material a candidate for many applications in the microelectronics industry (e.g. capacitors and DRAMs). Recently, thin films and submicron size particles of BaTiO@sub 3@ have been studied and have shown that dielectric and ferroelectric properties change as a function of grain size and density of the particles. To explain these effects, Landau-Devonshire theory has been applied to both thin film and particle geometry. As far as we know, no one has studied size effects in high aspect ratio BaTiO@sub 3@ nanostructure materials. Thus we have developed a synthetic strategy to produce high aspect ratio nanostructures via a sol-gel template method. A chelate sol-gel solution was made using Ba(OAc)@sub 2@ and Ti(Opr@super i@)@sub 4@. Whattman Anodisc Membranes with a 200 nm pore size were dipped into the solution, allowed to air dry, and then calcined to the appropriate temperature for the tetragonal or cubic phase. SEM analysis shows that the structures can be thought of as fibers with a 200 nm diameter and 50µm length. Powder X-ray diffraction, Raman Spectroscopy, and Differential Scanning Calorimetry of the structures confirmed the production of cubic and tetragonal phases when fired at 700°C and 900°C respectively. Dielectric behavior and polarization data also will be presented.