TY - JOUR A1 - Hmood, F. J. A1 - Günster, Jens A1 - Heinrich, J. T1 - Sintering and piezoelectric properties of K0.5Na0.5NbO3 glass microspheres T2 - Journal of the European Ceramic Society N2 - 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 280 MPa. 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. PB - Elsevier Ltd. CY - Oxford KW - KNN KW - Glass microspheres PY - 2015 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/34958 AN - OPUS4-34958 SN - 0955-2219 SN - 1873-619X VL - 35 IS - 15 SP - 4143 EP - 4151 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany