Sintering, Microstructure and Electrical Properties of MnO2 and CuO-Doped [Na0.515K0.485]0.94Li0.06(Nb0.99Ta0.01)O3 Ceramics

Pornsuda Bomlai

doi:10.4028/www.scientific.net/AMR.770.258

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 770Sintering, Microstructure and Electrical...

Sintering, Microstructure and Electrical Properties of MnO₂ and CuO-Doped [Na_0.515K_0.485]_0.94Li_0.06(Nb_0.99Ta_0.01)O₃ Ceramics

Abstract:

Ceramics with formula (1-x-y)[Na_0.515K_0.485]_0.94Li_0.06(Nb_0.99Ta_0.01)O₃ (NKLNT) xMnO₂ yCuO (when x, y = 0, 0.005 and 0.01) were prepared by a reaction sintering method. The effects of doping level on sinterability and properties of NKLNT ceramics were studied. The results indicated that the co-doping of MnO₂ and CuO was effective in promoting the densification of ceramics. Grain growth during secondary recrystallization was also affected, leading to larger grain size with x, y = 0.01 sample. X-ray diffraction data showed that the orthorhombic tetragonal morphotropic phase boundary existed in all the samples. At room temperature, the dielectric properties of NKLNT ceramics were improved by doping of appropriate MnO₂ and CuO content. The temperature dependence of dielectric constant showed a decrease slightly in Curie temperature (T_C) with increasing MnO₂ and CuO content. The composition with x = 0.005, y = 0 exhibited favorable properties for the promising lead-free piezoelectric candidate material.

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Advanced Materials Research (Volume 770)

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258-261

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.770.258

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September 2013

Authors:

Pornsuda Bomlai

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Doping, Electrical Properties, Lead-Free Materials, Reaction Sintering

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