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

  • JonathanĀ Breeze

Part of the Springer Theses book series (Springer Theses)

Table of contents

  1. Front Matter
    Pages i-xx
  2. Jonathan Breeze
    Pages 1-12
  3. Jonathan Breeze
    Pages 13-41
  4. Jonathan Breeze
    Pages 43-67
  5. Jonathan Breeze
    Pages 87-109
  6. Jonathan Breeze
    Pages 111-133
  7. Jonathan Breeze
    Pages 135-163
  8. Jonathan Breeze
    Pages 165-167

About this book

Introduction

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. 


Keywords

Complex Permittivity Dielectrics Complex Permittivity in Low-loss Dielectrics Complex Permittivity of Metal-oxides Density Functional Perturbation Theory Dielectric Ceramics Dielectric Properties of Metal-oxide Ceramics Electromagnetic Energy Dielectrics Emergent Terahertz Technologies Resonant Frequency of Dielectric Resonators

Authors and affiliations

  • JonathanĀ Breeze
    • 1
  1. 1.Imperial College LondonLondonUnited Kingdom

Bibliographic information

  • DOI https://doi.org/10.1007/978-3-319-44547-2
  • Copyright Information Springer International Publishing AG 2016
  • Publisher Name Springer, Cham
  • eBook Packages Chemistry and Materials Science
  • Print ISBN 978-3-319-44545-8
  • Online ISBN 978-3-319-44547-2
  • Series Print ISSN 2190-5053
  • Series Online ISSN 2190-5061
  • Buy this book on publisher's site
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