A new method for achieving enhanced dielectric response over a wide temperature range

Abstract

We report a novel approach for achieving high dielectric response over a wide temperature range. In this approach, multilayer ceramic heterostructures with constituent compositions having strategically tuned Curie points (TC) were designed and integrated with varying electrical connectivity. Interestingly, these multilayer structures exhibited different dielectric behavior in series and parallel configuration due to variations in electrical boundary conditions resulting in the differences in the strength of the electrostatic coupling. The results are explained using nonlinear thermodynamic model taking into account electrostatic interlayer interaction. We believe that present work will have huge significance in design of high performance ceramic capacitors.

Constructing phase boundary in AgNbO3 antiferroelectrics: pathway simultaneously achieving high energy density and efficiency

“…From application viewpoint, the temperature stability and cycling reliability of energy storage properties are important 16 , 50 . The temperature-dependent energy storage property of ANT55 is evaluated at 400 kV cm −1 to guarantee the safety in practical application, the corresponding results are given in Fig.…”

Topological phase transformations and intrinsic size effects in ferroelectric nanoparticles

“…However, studies of the influence of feature size on useful FE properties, and specifically the intrinsic limit for FE response, have been largely focused on bulk ceramics, thin films [20,21] and bi-/multilayers, [22][23][24][25] with relatively few investigations dedicated to nanoparticles and other nanostructures. [14,26,27] Tuning the particle size and the material parameters, as well as those of the surrounding environment, directly influences the strength of competing energy interactions within the system, including long-range electrostatics, short-range ferroelec-tric ordering and electrostrictive coupling between polar and elastic degrees of freedom.…”

Formation of polarization needle-like domain and its unusual switching in compositionally graded ferroelectric thin films: an improved phase field model

“…18 On the other hand, a high dielectric response over a wide temperature range has been reported for BaTiO 3 cgFE thin lms with altered Ba-site stoichiometry along the thickness. [19][20][21] In these studies, the interesting characteristic overlays the broad and at prole of the dielectric constant versus temperature, i.e., there is an absence of anomaly dielectric that is commonly observed in homogeneous ferroelectrics. The temperature independent dielectric constant originates from a strong smearing of the paraelectric-ferroelectric phase transition of the entire heterostructure accompanied by a reduction of the global transition temperature of the entire layer, with the highest Curie temperature due to the internal (depolarizing) electric elds.…”