SPS Sintering of NaNbO3-KNbO3 Piezoelectric Ceramics

Bo Ping Zhang; Li Min Zhang; Jing Feng Li; Hai Long Zhang; Song Zhe Jin

doi:10.4028/www.scientific.net/MSF.475-479.1165

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Fabrication of NiO-SDC Composite Anodes Using Gel-Casting for Low-Temperature SOFCs
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Molten Salts Synthesis and Dielectric Properties of PMN-PT Ceramics
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Intermediate-Temperature Solid Oxide Fuel Cells with Y_0.25Bi_0.75O_1.5-Ag Cathodes
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Preparation and Characterization of Tin Doped Tetra-Pod Shaped Zinc Oxide
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SPS Sintering of NaNbO₃-KNbO₃ Piezoelectric Ceramics
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Stabilization Effect in BaTiO₃ Single Crystal during Aging below Tc
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Study of the Weak Ferromagnetism in Ca_1-xLa_xB₆ Ceramics
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Preparation and Characterization of Antibacterial Titanate Whiskers
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Synthesis and Photoluminescence of Eu³⁺ Doped Sr₂CeO₄ via Carbonate Precursor
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HomeMaterials Science ForumMaterials Science Forum Vols. 475-479SPS Sintering of NaNbO3-KNbO3 Piezoelectric...

SPS Sintering of NaNbO₃-KNbO₃ Piezoelectric Ceramics

Abstract:

Lead-free piezoelectric ceramics have received more attention due to the environmental protection of the earth. Niobate ceramics such as NaNbO3 and KNbO3 have been studied as promising Pb-free piezoelectric ceramics, but their sintering densification is fairly difficult. In the present study, Spark Plasma Sintering (SPS) was applied to the sintering of Na0.5K0.5NbO3 ceramics, whose powder was synthesized by the conventional oxide mixing method. No loss of sodium and potassium were found in the SPS sintering process, by which the density of the K0.5Na0.5NbO3 solid solution ceramics was raised to 4.21g/cm3 (>93% of the theoretical density) at temperatures as low as 920°C. The crystal phase of the Na0.5K0.5NbO3 is an orthorhombic structure. The piezoelectric parameter (d33) of the K0.5Na0.5NbO3 ceramics reached 49 pC/N.