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Novel wedge-geometry, dual-layer alumina samples, both undoped and 500ppm Y 3+ -doped, were studied in the temperature regime 1250–1400°C to determine the effect of Y 3+ on oxygen grain-boundary transport in alumina. The samples consisted of a wedge-shaped, single-phase alumina top layer, diffusion bonded to an alumina/Ni substrate containing a fine, uniform dispersion of Ni marker...
Lead-free piezoelectric (K0.44Na0.52Li0.04)(Nb0.9-xTa0.1Sbx)O3 ceramics were prepared by traditional electrical ceramic technique. The effects of different Sb doping on the microstructure, phase, dielectric and piezoelectric properties were studied. The results indicate that the multielement niobate ceramics with higher piezoelectric properties can be fabricated from different Sb doping of Sb3+ or...
In this work, low temperature sintering of microwave dielectric (Zn1-xMgx)TiO3 were studied. Sintering temperature of (Zn1-xMgx)TiO3 system was lowered by the addition of dopants that could lower the sintering temperature while maintaining the dielectric properties. (Zn,Mg)TiO3 can be well densified at low temperatures for 4wt% Bi2O3 + 1wt% V2O5 -doped specimens. Dielectric properties of 4wt% Bi2O...
The quest to produce fully dense nanostructured ceramics has received much attention over the past 10 years. This short review highlights some of the progress made and indicates some of the avenues where further research should prove fruitful. The review concentrates mainly on the attempts to produce nanograined dense ceramics from transition aluminas, where the phase transformation into the thermodynamically...
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