NaNbO3–BaTiO3–Ba0.93Ca0.07TiO3 ceramic composites for temperature stable X8R rated dielectrics
Abstract
X7R rated dielectrics with room temperature relative permittivity (εr) of ∼2000 are produced as ceramic–ceramic composites based on a ferroelectric BaTiO3 matrix (BT, Curie Temperature, Tc = 122 °C) and a relaxor-ferroelectric Na0.6Ba0.4Nb0.6Ti0.4O3 filler (Tmax = −135 °C at 250 kHz) in a respective 80:20 wt. % mass fraction. X8R rating is achieved when the composite is formed with a Ba0.93Ca0.07TiO3 (BCT, Tc = 129 °C) matrix phase instead of BT. The enhancement from X7R to X8R performance is attributed to creating a broader εr peak at ∼121 °C due to a wider distribution of A-site cations in the composite, as opposed to an increase in Tc of monolithic BCT.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (4)
James H. Killeen
School of Chemical, Materials and Biological Engineering, Sir Robert Hadfield Building, University of Sheffield , Mappin Street, Sheffield S1 3JD,
Julian S. Dean
School of Chemical, Materials and Biological Engineering, Sir Robert Hadfield Building, University of Sheffield , Mappin Street, Sheffield S1 3JD,
Stuart Creasey-Gray
School of Chemical, Materials and Biological Engineering, Sir Robert Hadfield Building, University of Sheffield , Mappin Street, Sheffield S1 3JD,
Derek C. Sinclair
School of Chemical, Materials and Biological Engineering, Sir Robert Hadfield Building, University of Sheffield , Mappin Street, Sheffield S1 3JD,