Graded ferroelectrics: A new class of steady-state thermal/electrical/mechanical energy interchange devices
| Autor: | A. B. Catalan, Adolph L. Micheli, Majed Mohammed, Joseph V. Mantese, Ratna Naik, Norman W. Schubring, Greg Auner |
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| Rok vydání: | 1999 |
| Předmět: |
Materials science
Condensed matter physics Dielectric Condensed Matter Physics Ferroelectricity Electronic Optical and Magnetic Materials Pyroelectricity Condensed Matter::Materials Science Electric dipole moment Hysteresis Control and Systems Engineering Materials Chemistry Ceramics and Composites Electrical and Electronic Engineering Electrical conductor Excitation Mechanical energy |
| Zdroj: | Integrated Ferroelectrics. 24:155-168 |
| ISSN: | 1607-8489 1058-4587 |
| DOI: | 10.1080/10584589908215588 |
| Popis: | The diffuse-phase-transition class of ferroelectric materials allows the fabrication of films graded in composition: the consequence of which is an attendant gradient in electric dipole moment density. Alternating electric-field excitation of these graded structures reveal an asymmetrical hysteresis characteristic, together with a static displacement of the hysteresis trace. This displacement bias is observed to be a function of excitation level and temperature, which leads to a giant effective pyroelectric coefficient. Said displacement, for example, provides a continuous open-circuit voltage, or short-circuit current, provided that the structure is held in an isothermal condition. All other combinations of heat, electrical and strain energies suggest a whole new class of devices, and invite ingenious concepts and/or contributions. Graded ferroelectrics, which operate on principles of asymmetrical bound-charge, are broadly the dielectric analogue of conductive asymmetrical free-charge devices. F... |
| Databáze: | OpenAIRE |
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