Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/41107
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Title

QUANTITATIVE MICROSTRUCTURAL ANALYSIS AND PIEZOELECTRICITY OF HIGHLY DENSE, SUBMICRON-STRUCTURED NaNbO3 CERAMICS FROM MECHANICALLY ACTIVATED PRECURSORS

AuthorsMoure Arroyo, Alberto CSIC ORCID ; Hungría, Teresa CSIC; Castro, Alicia CSIC ORCID ; Pardo, Lorena CSIC ORCID
KeywordsQuantitative
Microstructural
Analysis
Análisis
Microestructural
Cuantitativo
Sodium
Niobate
Sodio
Niobato
Ceramic
Cerámica
Piezoelectricity
Piezoelectricidad
Mechanical
Activation
Activación
Mecánica
Issue Date14-Oct-2011
AbstractWe study in this work the processing of NaNbO3 ceramics prepared in a single thermal treatment of highly reactive precursors obtained by mechanical activation of different reagents, aiming to determine optimum conditions for piezoelectric ceramics production. Pressure-less sintering at 1200ºC leads to dense ceramics (<5% porosity) with poor mechanical stability, unsuitable for practical uses. Dense hot pressed ceramics were also obtained at lower temperatures (900-1100ºC), all of them in the submicron range of average grain sizes (< 400 nm). Their microstructure was quantitatively characterised and their elastic and electromechanical properties determined by an automatic iterative method from impedance measurements at resonance. A noticeable ensemble of piezoelectric and elastic properties (d33=38 pC.N-1 and Np=3252 kHz.mm) was measured for hot pressed ceramics, from precursors obtained by a combined route of wet-chemistry and mechanical activation, with a microstructure characterized by 0.4% residual porosity and a bimodal lognormal distribution of grain size.
Publisher version (URL)http://www.sciencedirect.com/science/article/pii/S0955221909000405
URIhttp://hdl.handle.net/10261/41107
ISSN0955-2219
Appears in Collections:(ICMM) Artículos




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