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Título

Structure, microstructure and electrical properties of Cu2+ doped (K,Na,Li)(Nb,Ta,Sb)O3 piezoelectric ceramics

AutorRubio Marcos, Fernando; Reinosa, Julián J.; Vendrell, X.; Romero Fanego, Juan José ; Mestres, L.; Leret, Pilar; Fernández Lozano, José Francisco; Marchet, Pascal
Palabras claveC. Piezoelectricity
D. Niobates
C. Ferroelectric properties
B. X-ray methods
Fecha de publicaciónmay-2013
EditorElsevier
CitaciónCeramics International 39(4): 4139-4149 (2013)
ResumenThis work studies the effects of copper doping on the properties of the (K0.44Na0.52Li0.04)(Nb0.86Ta 0.10Sb0.04)O3 piezoelectric ceramic material. Cu2+ incorporation into the perovskite structure produces a transformation of the crystalline lattice from tetragonal to orthorhombic symmetry together with an increase of the secondary phase. The grain size of the ceramic samples is increased due to the formation of a liquid phase during sintering, which increases with the Cu2+ content. EDS analysis reveals that the secondary-phase regions present a Cu and Nb-rich composition, indicating that the Cu-excess accommodates through the formation of this secondary phase. Cu-doping induces a rapid increase of the orthorhombic- tetragonal phase transition temperature, while the tetragonal-cubic phase transition temperature is decreased, the latter becoming more diffuse with the increase of Cu content. The piezoelectric properties of the material are reduced with the copper concentration, whereas the mechanical quality factor increases by a factor of nearly four. © 2012 Elsevier Ltd and Techna Group S.r.l.
Versión del editorhttp://dx.doi.org/10.1016/j.ceramint.2012.10.270
URIhttp://hdl.handle.net/10261/132821
DOI10.1016/j.ceramint.2012.10.270
Identificadoresdoi: 10.1016/j.ceramint.2012.10.270
issn: 0272-8842
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