In this study, the nanostructures of pure ZnO and ZnO:xCe³⁺ were prepared using statistic design—factorial design 3^(3-1)—3-level and mixed-level factorials and fractional with replicates in the central point, totaling 11 experiments. The experiments were performed using the microwave-assisted hydrothermal (MAH) method with Ce³⁺ concentration of 2 and 4 mol% at 60, 110, and 160 ℃ for 10, 20, and 30 min. X-ray diffraction (XRD), scanning electron m...

CeO₂ nanosheets were directly synthesized by a precipitation process with the aid of 1-butyl-3-methyl-imidazolium ionic liquids at room temperature. The anion species and the concentration of the room temperature ionic liquids (RTILs) have a great influence on the morphology of the resulting products. The as-prepared CeO₂ is irregular and agglomerated seriously in the absence of RTILs, while it changes from nanocube to nanosheet with increasing the RTIL concentration or ...

(1-x)BaTiO₃–xM_0.5Bi_0.5TiO₃ (M = Li, Na, K) solid solutions were prepared using BaTiO₃ pre-synthesized by oxalate method. The stability limits of (1-x)BaTiO₃–xLi_0.5Bi_0.5TiO₃ solid solutions have been established. It was shown that increase in M_0.5Bi_0.5TiO₃ concentration results in reduction of ceramic grain size in the (1-x)BaTiO...

We studied the photocatalytic and electrochemical impedance properties of two different sub-stoichiometric titania powders deposited using plasma spraying. Two different commercial powders with markedly diverse mean size as well as size distribution were chosen. Thermal oxidation of these as-received powders was carried out to restore the O/Ti ratio to be 2.0. By this way, another two kinds of feedstock powders were obtained. Total of four kinds of feedstock powders were used in the experimen...

CoCrMo alloys are contraindicated for allergy sufferers. For these patients, uncemented and cemented prostheses made of titanium alloy are indicated. Knee prostheses machined from that alloy, however, may have poor tribological behavior. Therefore, for allergy sufferers, knee replacements in form of cemented high-strength oxide ceramic prostheses which reveal excellent tribological behavior are suitable. In addition, the rate of particle induced aseptic loosening may be reduced. For adhesion ...

Friction and wear properties of nano-Si₃N₄/nano-SiC composite were studied under nanolubricated conditions. Mineral oil mixed with nanoparticles of diamond was used as lubricant. A friction coefficient of 0.043 and a wear coefficient of 4.2×10^-7 were obtained for nano-Si₃N₄/nano- SiC composite under normal load of 600 N with mineral oil + 0.5 wt% nanodiamond, whereas a friction coefficient of 0.077 and a wear coefficient of 10.3×10^-7...

An abnormal displacement change observed during the holding period in nanoindentation tests on a zirconia dental ceramic was reported in this paper. It was found that, at the initial stage of the holding period, the measured displacement versus time curves were similar in shape with the typical indentation creep curve reported in previous studies. As the holding lasted for long time, however, an evident reduction in displacement was observed for tests with high loading rate, implying that ano...

Zinc (Zn) nanoparticles and (Cu_0.5Tl_0.5)Ba₂Ca₂Cu₃O_10-δ (CuTl-1223) superconducting phase were prepared separately by sol–gel and solid-state reaction methods, respectively. Zn nanoparticles were added in CuTl-1223 superconducting matrix with different weight percentage during the final sintering process to obtain (Zn)_x/CuTl-1223 (x = 0–4 wt%) nanoparticle–superconductor composit...

The perovskite La_0.8Sr_0.2Ga_0.83Mg_0.17O_2.815 (LSGM) fuel cell electrolyte was prepared by a polymeric method using poly(vinyl alcohol) (PVA). The LSGM precursor powder was examined by thermogravimetric and differential thermal analysis (TG/DTA) and Fourier transform infrared (FTIR) spectroscopy. It was found that thermal decomposition of the LSGM precursor powder occurs in a number of different stages, and complete decomposition of the pre...

In this paper, novel Al₂O₃-based poly-hollow microsphere (PHM) ceramics were prepared using Si₃N₄ and Al₂O₃ PHMs as pore-forming agents. The effect of Si₃N₄ and Al₂O₃ PHMs with different percentages on properties of Al₂O₃-based PHM ceramics was investigated. Through adjusting percentage of Al₂O₃ PHMs, Al₂O₃-based PHM ce...