Graded ferroelectrics: A new class of steady-state thermal/electrical/mechanical energy interchange devices
作者:
N.W. Schubring,
J.V. Mantese,
A.L. Micheli,
A.B. Catalan,
M.S. Mohammed,
R. Naik,
G. Auner,
期刊:
Integrated Ferroelectrics
(Taylor Available online 1999)
卷期:
Volume 24,
issue 1-4
页码: 155-168
ISSN:1058-4587
年代: 1999
DOI:10.1080/10584589908215588
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
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.
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