Physics of Dielectrics for the Engineer

Physics of Dielectrics for the Engineer

1st Edition - January 1, 1979

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  • Author: Roland Coelho
  • eBook ISBN: 9780444601803

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Physics of Dielectrics for the Engineer is a systematic attempt to clarify and correlate advanced concepts underlying the physics of dielectrics. It reviews the basics of electrostatics, the different models for the polarizability of atoms and molecules, and the macroscopic permittivity. It also discusses the behavior of matter in an alternating field in relation to complex permittivity, the interactions between field and matter, dissipative effects under high electric fields, the wide-gap semiconductor model, the types of charge carriers, and the main disruptive processes. Organized into three parts encompassing 12 chapters, this volume begins with an overview of the physical concepts involved in the behavior of insulating materials subjected to high electric fields. It then explores the potential of a group of charges, and dipoles induced in an applied field. The book explains statistical theories of dipole orientation in an applied field and theories relating molecular and macroscopic quantities. The propagation of an electromagnetic wave, dipole relaxation of defects in crystal lattices, and space-charge polarization and relaxation are also discussed. The book explains the uni-dimensional polar lattice, intrinsic and impurity conduction in wide-gap semiconductors, thermal runaway, and collision breakdown. Many problems with corresponding solutions are included to assist the reader. This book will benefit electrical engineers, as well as electrical engineering students, scientists, and technicians.

Table of Contents

  • Preface

    List of Symbols

    Part 1. Matter in a Constant Electric Field

    I. Introduction - Condensed review of electrostatics

    II. The potential of a group of charges

    II.1. Multipolar expansions

    II.2. Multipolar expansion of a single point charge

    II.3. Multipolar expansion of a real dipole

    III. Dipoles induced in an applied field

    III.1. Quantum mechanical approach of electronic polarizability

    III.2. Elementary models for spherical atoms and molecules

    III.3. Elementary models for non-spherical atoms and molecules

    III.4. Harmonic oscillator model for the ionic polarizability

    IV. Statistical theories of dipole orientation in an applied field

    IV.1. Case of free point dipoles (Langevin's theory)

    IV.2. Case of point dipoles in crystal lattices

    IV.3. Case of polarizable dipoles with Δα > O

    V. Theories relating the molecular quantities to the macroscopic ones

    V.1. Dilute phases

    V.2. Condensed non-polar phases. Lorentz theory

    V.3. Condensed phases. Onsager theory

    V.4. The Kerr electro-optic effect

    Part 2. Matter in an Alternating Field

    VI. The complex permittivity

    VI.1. Definition of ε* and σ*. Propagation of an electromagnetic wave

    VI.2. The various types of charges and charge groups, and the corresponding interactions

    VI.3. The response of a linear material to a variable field

    VI.4. Case of an a.c. field. Kramers-Kronig relations

    VII. Relaxations

    VII.1. Introductory remarks

    VII.2. Mechanical analogue of a relaxation

    VII.3. Advanced formalism. Definitions and theorems

    VII.4. Application to dipole relaxation - Debye relation

    VII.5. The ε”(ε1) representation (Argand diagram)

    VII.6. Corrections to the Debye theory

    VII.7. Interfacial relaxation. Maxwell-Wagner effect

    VII.8. Dipole relaxation of defects in crystal lattices

    VII.9. Space-charge polarization and relaxation

    VII.10. Recent work. Many-body interpretation

    VIII. Resonances

    VIII.1. The linear oscillator model

    VIII.2. The unidimensional polar lattice

    Part 3. Dissipative Effects under High Fields

    IX. Insulators and wide-gap semiconductors

    IX.1. Intrinsic conduction and impurity conduction

    IX.2. Injection processes

    X. Space-charge limited, injection-controlled conduction

    X.1. Plane-parallel configuration

    X.2. Cylindrical configuration

    X.3. Spherical configuration

    X.4. Point-plane configuration

    XI. Field-induced intrinsic conduction

    XI.1. The Poole-Frenkel effect

    XI.2. Field-induced dissociation

    XI.3. General formulation of conduction with generation and recombination of carriers

    XII. Dielectric strength

    XII.1.Thermal breakdown

    XII.2.Intrinsic breakdown processes

    XII.3.Effect of pulse duration

    XII.4.Experimental procedures

    General Bibliography

    - Part 1

    - Part 2

    - Part 3


Product details

  • No. of pages: 188
  • Language: English
  • Copyright: © Elsevier 1979
  • Published: January 1, 1979
  • Imprint: Elsevier
  • eBook ISBN: 9780444601803

About the Author

Roland Coelho

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