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Ultrasonic Transducer Materials
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Table of Contents

1 Magnetostrictive Metals and Piezomagnetic Ceramics as Transducer Materials.- 1 Introduction.- 1.1. Ultrasonic Generators and Detectors.- 1.2. Magnetostriction Filters.- 2. Fundamentals of Magnetostriction.- 2.1. Static Magnetostriction Phenomena.- 2.2. Magnetostrictive Forces.- 2.3. Magnetrostriction Constants.- 2.4. Material Criteria.- 2.5. Effect of Hydrostatic Pressure on Magnetostriction.- 2.6. Effect of Mechanical Stress on Magnetostriction.- 3. Eddy Current Effects on Material Constants.- 4. Relation between Static and Dynamic Magnetostriction Phenomena.- 5. Methods of Material Measurement.- 5.1. Motional Impedance Methods.- 5.2. Measurement under Hydrostatic Pressure.- 5.3. Measurement under Static Compressive Stress.- 6. Magnetostrictive Properties of Materials.- 6.1. Nickel.- 6.2. Ni-Fe Alloy.- 6.3. Al-Fe Alloy.- 6.4. Other metals.- 6.5. Cobalt Rondel.- 6.6. Ferrites.- 6.7. Theoretical Models for the Characteristics of Magnetostriction in Polycrystalline Metals.- 7. Consideration of Large Signal Operation.- 7.1. Theoretical Approach.- 7.2. Experimental Approach.- References.- 2 Piezoelectric Crystals and Ceramics.- 1. Introduction.- 2. Fundamentals of Piezoelectricity.- 2.1. Basic Action and Linear Static Equations.- 2.2. Effect of Crystal Symmetry.- 2.3. The Piezoelectric Coupling Factor.- 3. Modes of Vibration of Piezoelectric Elements.- 3.1. Low-Frequency Modes.- 3.2. High-Frequency or Thickness Modes.- 3.3. The Effective Coupling Factor-The Piezoelectric Resonator.- 4. Ferroelectricity.- 4.1. General Description.- 4.2. Piezoelectricity in Ferroelectrics-The Piezoelectric Ceramics.- 4.3. Nonlinearities-Domain Effects.- 4.4. Phase Transitions.- 5. Dissipation in Piezoelectric Materials.- 5.1. General.- 5.2. Effects on Transducer Efficiency and Power Capacity.- 6. Parameters of Important Piezoelectric Crystals.- 6.1. Older Piezoelectric Crystals.- 6.2. Newer Piezoelectric Crystals.- 7. Parameters of Piezoelectric Ceramics.- 7.1. General.- 7.2. Aging in Piezoelectric Ceramics and Effects of High Static Stress.- Notation.- References.- 3 Piezoelectric Transducer Materials and Techniques for Ultrasonic Devices Operating Above 100 MHz.- 1. Introduction.- 1.1. Scope of Chapter.- 1.2. Results from the Equivalent Circuit Analysis of High-Frequency Ultrasonic Devices Using Piezoelectric Transducers.- 1.3. Properties of Transducer Materials and Acoustic Materials of Interest for High-Frequency Applications.- 2. Materials and Techniques for Bonded Plate Transducers.- 2.1. Single-Crystal Materials.- 2.2. Ceramic Transducer Materials.- 2.3. Bonding and Lapping Techniques for High-Frequency Transducers.- 3. Evaporated and Sputtered Film Transducers.- 3.1. Electroelastic Properties of Cadmium Sulfide and Zinc Oxide in the Form of Thin Films.- 3.2. Evaporation Techniques for Forming CdS Transducers.- 3.3. Sputtering Techniques for Forming ZnO Transducers.- 3.4. Other Compounds of Potential Interest for Film Transducers.- 4. Concluding Remarks.- References.

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