Temperature and Frequency Dependence of Complex Permittivity in Metal Oxide Dielectrics: Theory, Modelling and Measurement (Springer Theses)
Language: English
Published by Springer, 2018
- Softcover
- New
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In English.
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- Title
- Temperature and Frequency Dependence of Complex Permittivity in Metal Oxide Dielectrics: Theory, Modelling and Measurement (Springer Theses)
- Author
- Breeze, Jonathan
- Publisher
- Springer
- Publication year
- 2018
- Condition
- New
- Binding
- Soft cover
- Language
- English
- ISBN 10
- 3319830767
- ISBN 13
- 9783319830766
- Item weight
- 393 grams
- Series
- Book 182 of 797: Springer Theses
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.
"Synopsis" may belong to another edition of this title.
About the Author
My principal research interests lie in room-temperature maser, the measurement and modelling of the dielectric properties of microwave dielectric materials, the design of high Q-factor and Purcell-factor resonators and density functional calculations of materials. Other research areas are microwave filter design, photonic bandgap structures, metamaterials and the measurement of the electrical and magnetic properties of thin films at microwave frequencies.
"About the title" may belong to another edition of this title.
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