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Título

Phase Transitions in Lead-free Piezoelectric Ceramics Monitored by the Resonance Method

Autor Pardo, Lorena ; García, Álvaro ; Brebøl, Klaus; Mercadelli, Elisa; Galassi, Carmen
Palabras clave Bismuth Sodium Titanate
Lead-Free
Piezoelectric Ceramics
Crystal Structure
Ferroelectrics
Phase Transitions
Shear Resonances
Fecha de publicación 2015
EditorElsevier
Citación Physics Procedia 63: 61–66 (2015)
ResumenFerroelectrics, like batio3 (bt) or binatio3 (bnt), were studied in the 1950s and are now revisited, due to the need for lead-free piezoceramics, according to worldwide directives for environmental protection. Poling some of these materials has shown a different physical mechanism than ferroelectric domain orientation, involving field-induced structural phase transitions from pseudo-cubic phases to ferro-piezoelectrically active ones. They also depolarize below the curie temperature due to a structural phase transition. Both poling and thermal depoling can be monitored by the measurement of the electromechanical resonances. Depoling of (1-x) bnt-xbt ceramics with x=0.04 (bnbt4) is here considered as a case study.
Descripción Presentación Oral en el "43rd Annual Symposium of the Ultrasonic Industry Association, UIA". CSIC Residencia de Estudiantes- Madrid (España) 23 - 25 abril 2014.-- This is an open access article under the CC BY-NC-ND license
Versión del editorhttp://dx.doi.org/10.1016/j.phpro.2015.03.010
URI http://hdl.handle.net/10261/114183
DOI10.1016/j.phpro.2015.03.010
ISSN1875-3892
E-ISSN1875-3884
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