Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/40791
Share/Export:
logo share SHARE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE

Invite to open peer review
Title

Enhanced properties for ultrasonic transduction, phase transitions and thermal depoling in 0.96(Bi0.5Na0.5)TiO3-0.04BaTiO3 submicron structured ceramic

AuthorsPardo, Lorena CSIC ORCID; García, Álvaro CSIC; Brebøl, Klaus; Mercadelli, Elisa; Galassi, Carmen
KeywordsPiezoelectricity
Piezoelectricidad
Dielectric
Permitivity
Permitividad
Dieléctrica
Sodium
Sodio
Barium
Bario
Bismuto
Bismuth
Titanate
Titanato
Lead-Free
Verde
Ceramic
Cerámica
Resonance
Resonancia
Phase
Transition
Transición
Thermal
Depoling
Despolarización
Issue Date7-Oct-2011
AbstractSubmicron structured (grain size≈500nm), dense (Bi0.5Na0.5)0.96Ba0.04TiO3 ceramics were obtained from sol-gel autocombustion nanopowders by hot-pressing (700-950⁰C) and subsequent recrystallization (1000-1050⁰C). Electromechanical coefficients were obtained by analysis of the resonance spectra of thin disks using Alemany et al. software. The real part of the room temperature set of coefficients of the best performing materials (εσ33=(416 –16 i), d31= (-22.68 + 0.55 i)pC/N-1, kt= 44.5%, kp=21.1% ) can be compared with those of coarse-grained ceramics and d33 (95 pC.N-1) is higher. Shear related coefficients were obtained from thickness poled and length excited plates (εσ11= (402 –89i), d15=(108.3 – 21.4 i) pC.N-1 and k15=39.2%). At the depolarization temperature, Td=153⁰C, the dielectric loss, tanδ(T), of poled samples shows a maximum and the planar resonance virtually vanishes. Shear resonance of thickness-poled plates and weak planar electromechanical resonance are observed above Td. The relaxor behaviour extends up to the isotropization point, Ti=238⁰C. This can be understood as due to the coexistence of the room temperature ferroelectric phase in the stability range of the low temperature non-polar phase at zero field, between Td and Ti.
DescriptionCSIC project #201060E069 and supported by the European Network of Excellence (NoE-MIND CE FP6 515757-2)
Publisher version (URL)http://iopscience.iop.org/0022-3727/44/33/335404
URIhttp://hdl.handle.net/10261/40791
ISSN0022-3727
Appears in Collections:(ICMM) Artículos




Files in This Item:
File Description SizeFormat
JPD 2011 accepted document.pdf1,67 MBAdobe PDFThumbnail
View/Open
Show full item record

CORE Recommender

Page view(s)

371
checked on Apr 13, 2024

Download(s)

134
checked on Apr 13, 2024

Google ScholarTM

Check


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.