In this work, “lead free” 0.99K0.5Na0.5NbO3-0.01BiFeO3 (KNN–BF) piezoceramics were prepared by a combination of mechanochemical activation, Spark Plasma Sintering and post-annealing treatment. Results show that the annealing treatment causes important microstructural electrical changes. The SPS sample was characterized low resistance, while air annealed samples showed better insulating properti...

Abstract Highly transparent 0.5 and 1.0 at% Pr-doped Y 2 O 3 ceramics were fabricated by vacuum sintering plus hot isostatic pressing (HIP) treatment. The selection of suitable pre-sintering temperatures right microstructures before HIP was critical to obtain high density the final sintered bodies. well-densified had pore-free with an average grain size about 1 µm. It also found that charge sta...

High Q ceramics of Ba3W2O9 (BW)-substituted Ba(Zn1/3Nb2/3) O3 (BZN) were prepared with a zero τf through the partial substitution of Zn by Ni and Co. The small concentrations of B-site vacancies introduced by the substitution of BW accelerated the kinetics and stability of the cation ordering and lowered the sintering temperature. Dense, zero τzf, ordered solid solutions such as 0.99Ba(Zn0.3Co0...

In this work, structural and dielectric properties of BaTi(1-x)ZrxO3 (BTZ) ceramics prepared by Spark Plasma Sintering (SPS) from powders obtained via Self-propagating High-temperature Synthesis (SHS) are shown to be strongly affected the sintering temperature. addition, a post-annealing treatment in air as-prepared leads transition hexagonal tetragonal cubic phases. The SPS corresponding compo...

Using ZnO as a model system, the densification mechanisms of flash sintering are investigated. Controlled experiments via limiting the maximum current or the effective ramp rate suggest that both the maximum specimen temperature and the high heating rate (on the order of 200 C/s) are essential for the rapid densification during the flash sintering. Moreover, benchmarking rapid thermal annealing...

Heat treatment is a standard method to increase the hardness of silica in various applications. Here, we tested the effect of high temperature annealing on the mechanical properties of silica microcapsules by force spectroscopy under point loads applied to the particle shell. The Young's modulus of the shells moderately increases after annealing at temperatures above 500 °C. Temperatures over 8...

Dielectric ageing behaviors of lead-based relavor ferroelectric ceramics, which may affect their application in multilayer ceramic capacitors (MLCs), have been an important research problem for many years. In this paper, the effects of annealing on ageing properties of the PMN-O.1PT system, respectively doped with Fe, CO and Ni ions and annealed in different atmospheres (air and Nz-Hz) after si...

A novel preparing method of polymer-coated molybdenum powder was presented. A type of multi-component polymer-coated molybdenum powder was chosen for selective laser sintering. The effect of the process parameters on the part’s characteristics is investigated. Based on our study for dynamic laser sintering process of polymer-coated molybdenum powder, its laser sintering mechanism was reported a...

Recently, Cu2-δS and Cu2-δSe were reported to have an ultralow thermal conductivity and high thermoelectric figure of merit zT. Thus, as a member of the copper chalcogenide group, Cu2-δTe is expected to possess superior zTs because Te is less ionic and heavy. However, the zT value is low in the Cu2Te sintered using spark plasma sintering, which is typically used to fabricate high-density bulk s...

Reactive powders of stoichiometry Nd2(Ti2/3Al1/3)3O9-δ and thin films of (Ba0.7Sr0.3)TiO3 have been prepared by the conventional mixed-oxide method and the metal-organic deposition method, respectively. The corresponded phases after calcination and sintering are investigated by XRD diffraction. Single phase of Nd2(Ti2/3Al1/3)3O9-δ could be only obtained by sintering over 1400C for 4 h. (Ba0.7Sr...