Variation of Permittivity with Electric Field in Perovskite‐Like Ferroelectrics

Local Electric Field Variation in the Field Emission Process

Tunnelling probabilities in field emission processes are usually calculated assuming flat emitting surfaces. This corresponds to consider the electric field as a constant along the potential barrier. Previous work have shown the importance of taking into account image effects but neglecting local field variations. Even when the local field has been taken into account, a proper three dimensional...

In situ Transmission Electron Microscopy Studies of Electric-field-induced Phenomena in Ferroelectrics

High electric fields were delivered to specimens during imaging in the transmission electron microscopy (TEM) chamber to reveal details of electric field-induced phenomena in ferroelectric oxides. These include the polarization switching in nanometer-sized ferroelectric domains and the grain boundary cavitation in a commercial lead zirconate titanate (PZT) polycrystalline ceramic, the domain wa...

Lorentz-type relationship of the temperature dependent dielectric permittivity in ferroelectrics with diffuse phase transition

permittivity in ferroelectrics with diffuse phase transition Shanming Ke, Huiqing Fan, Haitao Huang, and H. L. W. Chan State Key Laboratory of Solidification Processing, School of Materials Science, Northwestern Polytechnical University, Xi’an 710072, People’s Republic of China Department of Applied Physics and Materials Research Center, The Hong Kong Polytechnic University, Hung Hom, Kowloon, ...

Dielectric Permittivity and Electric Modulus in Bi2Ti4O11

Influence of electric field on local phase transformations in relaxor ferroelectrics PbSc0.5Ta0.5O3 and Pb0.78Ba0.22Sc0.5Ta0.5O3

In situ temperature-dependent Raman-scattering experiments under an external dc electric field E have been performed on (PST-Ba) in order to give further insights into the atomistic mechanism of polar coupling in perovskite-type (ABO 3) relaxor ferroelectrics near the intermediate characteristic temperature T ?. The polarized Raman spectra collected under an electric field E applied along the c...