Abstract
Laser-fused K0.5Na0.5NbO3 (KNN) powder of 75% transparent fraction has been sintered by pressureless sintering, spark plasma sintering (SPS), and hot isostatic pressing (HIP). The laser-fused KNN has a fictive temperature of 503°C and an onset crystallization temperature of around 529°C. The results have shown that sintering of the laser-fused KNN powder utilizing the viscous flow of the transparent microspheres (amorphous content)–at the kinetic window (26°C)–is possible. The highest yield relative density is around 83% at a sintering temperature of 525°C and at a sintering pressure of 280MPa. Limited density has been reached because of formation of crystalline surface layers around the amorphous areas. The samples hipped at 525°C have low piezoelectric coefficient d33 of 5 pC/N because of the residual porosity that led to early dielectric breakdown during the polarization. The sintering behavior, the resulting microstructure as well as the measured properties will be discussed.
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