期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 34, 期 10, 页码 2249-2257出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2014.02.002
关键词
Lead-free piezoelectrics; KNL-NTS; Piezoelectric ceramics
资金
- CONICET
- ANCPyT (Argentina)
- MICINN [MAT 2010-21088-C03-01]
- CSIC for a Junta de Ampliacion de Estudios [JAEDOC071]
The effect of B-site compositional homogeneity on microstructure, piezoelectric properties and dielectric behaviour of lead-free piezoelectric ceramics, (K0.44Na0.52Li0.04) (Nb0.86Ta0.10Sb0.04)O-3, is investigated. The B-site compositional homogeneity is evaluated by using an intermediate precursor obtained by solid state reaction between adequate amounts of Nb2O5, Ta2O5 and Sb2O5, calcined at 1350 degrees C and attrition milled. The B-site precursor powder is mixed with alkaline carbonates to synthesize perovskite powders and, finally, sinter piezoceramics. X-ray diffraction and Raman spectroscopy reveal the formation of a perovskite phase, although tetragonal tungsten-bronze structure is detected as minor secondary phase. Ceramics processed by using B-site precursor show different crystalline structure as a function of sintering conditions or K/Na ratio. The B-site precursor route produces thus lower piezoelectric properties, but the control of alkali volatilization by using sintering powder bed resulted in a relevant decrease of dielectric losses that favours the d(33) enhancement. (C) 2014 Elsevier Ltd. All rights reserved.
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