The theory of the dielectric and crystallographic properties of barium titanate is considered. By expanding the free energy as a function of polarization and strain and making reasonable assumptions about the coefficients, it is found possible to account for the various crystal transitions. Calculations...
[World Scientific Series in 20th Century Physics] A Career in Theoretical Physics Volume 35 || Theory of Ferroelectric Behavior of Barium TitanateThis is my first review paper — a forerunner of the "soft mode" paper of 1958. Bill Shockley hired me at Bell to work on his ideas on ...
摘要: Anomalous high permittivity in fine-grained barium titanate, which has recently been explained by an internal stress model, can also be explained by an internal field model and phenomenological theory, although the existence of the field in the fine-grained sintered ceramic is uncertain....
showing why the phase transitions between the lower symmetry phases occur, and demonstrating how a complete set of the polynomial coefficients can be derived from experimental data. He continued the case study of barium titanate by showing...
Our calculations show that the threshold as well as the reflectivity of a SPB-FWM SPPC strongly depend on γ2l2 and R′. It is also shown that a high phase-conjugate reflectivity can be easily realised in doped barium titanate crystals which are shown to have much larger γ1 and γ2 ...
According to the theory of dielectric physics, 2~18 GHz microwave frequency range, dielectric loss mechanisms of barium ferrite is primarily dipole orientation polarization, barium titanate dielectric loss is mainly derived from the permanent electric dipole polarization and orientation of the Inter ...
Effects of feed material and annealing atmosphere on the properties of photorefractive barium titanate crystals Growth and fabrication of commercial BaTiO3 photorefractive crystals are described. Crystals grown from two different titanium dioxide sources and annealed... PG Schunemann,TM Pollak,Y Yang,.....
The piezoresistivity matrix elements for semiconducting barium titanate, that has a positive temperature coefficient of resistivity, have been derived from the stress dependence of a back-to-back Schottky-barrier model. Numerical computa... A Amin - 《Physical Review B Condensed Matter》 被引量: 16...
We demonstrate the theory by studying oxygen vacancies in barium titanate. We find the formation of depletion layers, regions of depleted electrons, and a large electric field at the ferroelectric鈥揺lectrode boundary. We also find the formation of a charge double layer and a large electric ...
Dielectric and tunable characteristics of barium strontium titanate modified with Al2O3 addition The effect of doping Al 2O 3 on the Ba 0.6Sr 0.4TiO 3 ceramics was investigated. A strong correlation was observed between the average grain size and Al 2O... X Liang,W Wu,Z Meng - 《...