Temperature and Frequency Dependence of Complex Permittivity in Metal Oxide Dielectrics: Theory, Modelling and Measurement

Nonfiction, Science & Nature, Technology, Microwaves, Material Science
Cover of the book Temperature and Frequency Dependence of Complex Permittivity in Metal Oxide Dielectrics: Theory, Modelling and Measurement by Jonathan Breeze, Springer International Publishing
View on Amazon View on AbeBooks View on Kobo View on B.Depository View on eBay View on Walmart
Author: Jonathan Breeze ISBN: 9783319445472
Publisher: Springer International Publishing Publication: September 8, 2016
Imprint: Springer Language: English
Author: Jonathan Breeze
ISBN: 9783319445472
Publisher: Springer International Publishing
Publication: September 8, 2016
Imprint: Springer
Language: English

This thesis investigates the dielectric properties of metal-oxide ceramics at microwave frequencies. It also demonstrates for the first time that a theory of harmonic phonon coupling can effectively predict the complex permittivity of metal oxides as a function of temperature and frequency. Dielectric ceramics are an important class of materials for radio-frequency, microwave and emergent terahertz technologies. Their key property is complex permittivity, the real part of which permits the miniaturisation of devices and the imaginary part of which is responsible for the absorption of electromagnetic energy. Absorption limits the practical performance of many microwave devices such as filters, oscillators, passive circuits and antennas. Complex permittivity as a function of temperature for low-loss dielectrics is determined by measuring the resonant frequency of dielectric resonators and using the radial mode matching technique to extract the dielectric properties.

There have been only a handful of publications on the theory of dielectric loss, and their predictions have often been unfortunately unsatisfactory when compared to measurements of real crystals, sometimes differing by whole orders of magnitude. The main reason for this is the lack of accurate data for a harmonic coupling coefficient and phonon eigenfrequencies at arbitrary q vectors in the Brillouin zone. 

Here, a quantum field theory of losses in dielectrics is applied, using results from density functional perturbation theory, to predict from first principles the complex permittivity of metal oxides as functions of frequency and temperature. 

View on Amazon View on AbeBooks View on Kobo View on B.Depository View on eBay View on Walmart

This thesis investigates the dielectric properties of metal-oxide ceramics at microwave frequencies. It also demonstrates for the first time that a theory of harmonic phonon coupling can effectively predict the complex permittivity of metal oxides as a function of temperature and frequency. Dielectric ceramics are an important class of materials for radio-frequency, microwave and emergent terahertz technologies. Their key property is complex permittivity, the real part of which permits the miniaturisation of devices and the imaginary part of which is responsible for the absorption of electromagnetic energy. Absorption limits the practical performance of many microwave devices such as filters, oscillators, passive circuits and antennas. Complex permittivity as a function of temperature for low-loss dielectrics is determined by measuring the resonant frequency of dielectric resonators and using the radial mode matching technique to extract the dielectric properties.

There have been only a handful of publications on the theory of dielectric loss, and their predictions have often been unfortunately unsatisfactory when compared to measurements of real crystals, sometimes differing by whole orders of magnitude. The main reason for this is the lack of accurate data for a harmonic coupling coefficient and phonon eigenfrequencies at arbitrary q vectors in the Brillouin zone. 

Here, a quantum field theory of losses in dielectrics is applied, using results from density functional perturbation theory, to predict from first principles the complex permittivity of metal oxides as functions of frequency and temperature. 

More books from Springer International Publishing

Cover of the book Device-to-Device Communications in Cellular Networks by Jonathan Breeze
Cover of the book Lectures on LHC Physics by Jonathan Breeze
Cover of the book Touschek Lifetime Studies and Optimization of the European Synchrotron Radiation Facility by Jonathan Breeze
Cover of the book Infrared Non-local Modifications of General Relativity by Jonathan Breeze
Cover of the book African Immigrant Traders in Inner City Johannesburg by Jonathan Breeze
Cover of the book Megacities 2050: Environmental Consequences of Urbanization by Jonathan Breeze
Cover of the book New Religions and State's Response to Religious Diversification in Contemporary Vietnam by Jonathan Breeze
Cover of the book Quantum Metrology, Imaging, and Communication by Jonathan Breeze
Cover of the book Secularists, Religion and Government in Nineteenth-Century America by Jonathan Breeze
Cover of the book Emerging Powers in Africa by Jonathan Breeze
Cover of the book Information and Communication Technologies in Tourism 2014 by Jonathan Breeze
Cover of the book Applied Photochemistry by Jonathan Breeze
Cover of the book Fiscal Policies in High Debt Euro-Area Countries by Jonathan Breeze
Cover of the book Biological Effects of Metal Nanoparticles by Jonathan Breeze
Cover of the book Signs of Signification by Jonathan Breeze
We use our own "cookies" and third party cookies to improve services and to see statistical information. By using this website, you agree to our Privacy Policy