Abstract
The "hard" paraelectrics as a material with a high dielectric constant and low loss at microwave frequencies are considered. The impact of differenttypes of polarization on the dielectric and thermal properties of paraelectric is described. The tetragonal rutile structure is considered and the influenceof the oxygen octahedrons TiO6 on the dielectric constant of the paraelectric is established. References 5, figures 2.
Highlights
High dielectric constant ceramics with good thermal stability of their parameters have many compositions that use in various areas of electronics
In the displace type paraelectrics the electronic polarization with its dielectric contribution ε(∞) = εopt has noticeable influence on the frequencies of the infrared vibrations: on the longitudinal mode ωLO and, especially, on the transverse mode ωTO
It is found that most part of the εmic in the rutile and perovskite is caused by highly polarizable oxygen octahedrons TiO6 which are connected at the vertices
Summary
High dielectric constant ceramics with good thermal stability of their parameters have many compositions that use in various areas of electronics. Large εmic is possible only in the ferroelectrics and in paraelectrics of the displace type in which high permittivity is formed mainly by soft lattice vibration frequency mode ωTO. In the displace type paraelectrics (that belong to the ionic crystals) the electronic polarization with its dielectric contribution ε(∞) = εopt has noticeable influence on the frequencies of the infrared vibrations: on the longitudinal mode ωLO and, especially, on the transverse mode ωTO. That is why it is possible to govern dielectric properties by the degree of the electronic shells interaction and their reciprocal displacement by means of different ions implementation to the structure By this way, it is possible significantly weaken the critical ε(T) dependence (according to the Curie-Weiss low) and maintain a high polarizability. In the second part of the article will be considered an increase in the thermal stability of the paraelectrics, especially BLT ceramics, at microwave frequencies by its doping rare-earth ions [5]
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