Mean-Field Approach to Dielectric Relaxation in Giant Dielectric Constant Perovskite Ceramics
نویسندگان
چکیده
منابع مشابه
MOCVD approach to perovskite based thin films: From high Tc superconductors to giant dielectric constant materials
Perovskite thin films with various functional properties have been synthesized through the Metal Organic Chemical Vapour Deposition (MOCVD). The MOCVD processes, used for the fabrication of a variety of advanced materials in thin film form, rely upon application of a molten multi-element source. The challenging in-situ strategy involves the use of a molten source consisting of a second-generati...
متن کاملHigh frequency dielectric relaxation in polymers filled with ferroelectric ceramics
We investigated the dielectric relaxation process in high-dielectric constant polymer composite films filled with barium titanate particles. In order to extend the dielectric measurements to the microwave range, we employed a new broadband measurement technique where a thin film capacitance terminating a coaxial waveguide is treated as a transmission line. The complex permittivity, measured at ...
متن کاملDielectric Relaxation in Ceramics with Intragrain Concentration Gradient
We created a material with a composition gradient within each grain. Due to the graded composition the ceramic does not show a sharp change in dielectric constant near the relaxation frequency. Instead, we observe gradual decrease in dielectric constant with frequency, with the loss tangent remaining practically unchanged (below 0.02 everywhere within the frequency range 0.0003-3 GHz). The tuna...
متن کاملDielectric constant of ionic solutions: a field-theory approach.
We study the variation of the dielectric response of a dielectric liquid (e.g. water) when a salt is added to the solution. Employing field-theoretical methods, we expand the Gibbs free energy to first order in a loop expansion and calculate self-consistently the dielectric constant. We predict analytically the dielectric decrement which depends on the ionic strength in a complex way. Furthermo...
متن کاملAn Explanation of the Photoinduced Giant Dielectric Constant of Lead Halide Perovskite Solar Cells.
A photoinduced giant dielectric constant of ~10(6) has been found in impedance spectroscopy measurements of lead halide perovskite solar cells. We report similar effects in measurements of a porous lead zirconate titanate (PZT) sample saturated with water. The principal effect of the illumination of the solar cell and of the introduction of water into the pore volume of the PZT sample is a sign...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Ceramics
سال: 2013
ISSN: 2090-8628,2090-8644
DOI: 10.1155/2013/795827