Landau-Devonshire Parameters for the Tunable Paraelectric Material BaTi.9(Sc,Ta).05O3

Report No. ARL-TR-4410
Authors: Virginia Miller and Frank Crowne
Date/Pages: March 2008; 20 pages
Abstract: Measured values of the nonlinear electrical response of the perovskite ferroelectric compound BaTi.9(Sc,Ta).05O3 are used to deduce the thermodynamic Landau-Devonshire parameters of the material, which are found to differ strongly from those of the parent material BaTiO3, despite the small amount of added Sc and Ta. The compound is found to cubic, with a low transition temperature of 60 ¿C. An explanation for this behavior is advanced based on quenching of electrostriction.
Distribution: Approved for public release
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Last Update / Reviewed: March 1, 2008