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Structure and piezoelectric properties of lead-free (Na0.52K0.44− x)(Nb0.95− xSb0.05)O3- xLiTaO3 ceramics.
- Source :
- Journal of Materials Science: Materials in Electronics; Mar2010, Vol. 21 Issue 3, p241-245, 5p, 1 Diagram, 4 Graphs
- Publication Year :
- 2010
-
Abstract
- Lead-free (Na<subscript>0.52</subscript>K<subscript>0.48− x</subscript>)(Nb<subscript>0.95− x</subscript>Sb<subscript>0.05</subscript>)O<subscript>3</subscript>- xLiTaO<subscript>3</subscript> ( x = 0.025–0.05) piezoelectric ceramics in which the Sb content is kept constant, have been specially designed and successfully fabricated by a conventional solid state reaction method. The (Na<subscript>0.52</subscript>K<subscript>0.48</subscript>)(Nb<subscript>0.95</subscript>Sb<subscript>0.05</subscript>)O<subscript>3</subscript> ceramics can be well sintered after A-site and B-site cations are replaced by Li<superscript>+</superscript> and Ta<superscript>5+</superscript>, respectively. A single-phase perovskite structure remains within the studied substitution concentration. An orthorhombic-tetragonal phase transition occurs with gradually increasing the content of Li<superscript>+</superscript> and Ta<superscript>5+</superscript>, and was identified in the composition range of 0.0375 < x < 0.0425 where two kinds of ferroelectric phases may coexist and simultaneously a strong compositional dependence of electrical properties was found out. An appropriate content of Sb effectively enhanced the piezoelectric properties of the materials. The optimum overall properties with a piezoelectric constant d<subscript>33</subscript> of 321 pC/N, a dielectric constant $$ \varepsilon_{33}^{T} $$ of 1,780, a planar electromechanical coupling coefficient k<subscript>p</subscript> of 0.52 and a Curie temperature T<subscript>c</subscript> of 315 °C were obtained in the composition with x = 0.0425, indicating the ceramics studied have potentials for replacing lead-containing ceramics for device applications. [ABSTRACT FROM AUTHOR]
- Subjects :
- PIEZOELECTRIC materials
CERAMICS
PHASE transitions
FERROELECTRICITY
OXIDE minerals
Subjects
Details
- Language :
- English
- ISSN :
- 09574522
- Volume :
- 21
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Journal of Materials Science: Materials in Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 48004410
- Full Text :
- https://doi.org/10.1007/s10854-009-9899-y