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Title

Sintering and properties of lead-free (K,Na,Li)(Nb,Ta,Sb)O3 ceramics

AuthorsRubio Marcos, Fernando CSIC ORCID; Ochoa, Pilar; Fernández Lozano, José Francisco CSIC ORCID
KeywordsSintering
Microstructure final
Issue Date2007
PublisherElsevier
CitationJournal of the European Ceramic Society 27 (2007) 4125–4129
AbstractTwo different stoichiometric (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3 and non-stoichiometric (K0.38Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04) O2.97 compositions were prepared by the conventional mixed oxide and carbonate route. Low temperature synthesis process at 700 ◦C for 2 h, and further attrition milling process resulted in agglomerated powder of 500 nm of primary particles in the range of 50–70 nm. The ceramics sintered at 1125 ◦C showed the highest densification that decreased for higher sintering temperatures. Non-stoichiometric composition densification process was assisted through the presence of a liquid phase that promotes grain growth and the appearance of a secondary ferroelectric phase with tungsten–bronze type structure. The samples showed a relaxor type behaviour that diminished because of the compositional homogeneity improvement of the liquid phase in the non-stoichiometric samples. The higher piezoelectric properties were obtained for the samples with high ferroelectric type dielectric constant versus temperature behaviour. In the non-stoichiometric samples piezoelectric constant d33 values reach ∼200 pC/N.
Publisher version (URL)doi:10.1016/j.jeurceramsoc.2007.02.110
URIhttp://hdl.handle.net/10261/17689
DOI10.1016/j.jeurceramsoc.2007.02.110
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