Plasma nitriding of austenitic stainless steel may result in the formation of a nitrided layer, which is responsible for the increase in hardness, as well as wear and corrosion resistance of this material. In this work, the effect of yttria on the micro-abrasive wear behavior of plasma nitrided ...

Publisher SummaryThere are several complete compilations of the literature concerning zirconium and hafnium that take the reader up to about 1960. Since then several reviews of more limited scope have been published, one on the structural aspects of zirconium chemistry, and others on the separat...

A facile and economical hydrothermal method was used to synthesise Zn2SnO4 nanoparticles with cubic spinel structure. The crystallography and optical properties of the as-synthesised nanoparticles were studied using X-ray diffraction (XRD) and UV–visible spectroscopy (UV–vis). The morphology o...

We successfully synthesized a semiconducting zinc stannate (Zn2SnO4) - with a face-centred cubic spinel structure, a band gap (Eg = 3.4eV), and a crystallite size of 29 nm - by co-precipitation. Post-thermal treatment revealed three transition temperatures: 500 °C, 700 °C and 1000 °C. We syst...

In this research, the gas sensing behavior of Pd nanoparticles loaded zinc stannate/zinc oxide (Zn2SnO4/ZnO) nanowires were investigated. The Zn2SnO4/ZnO nanowires were grown on Au interdigitated alumina substrate by carbon assisted thermal evaporation process. Pd nanoparticles were loaded on th...

Polycrystalline zinc stannate (Zn2SnO4) nanowires have been studied for its synthesis optimization using novel carbothermal catalytic method, wherein binary oxide precursors were used under inert atmosphere at variable CVD synthesis parameters. X-ray diffraction, FESEM, EDS, HRTEM, Raman and CL ...

A novel procedure for producing polycrystalline zinc stannate (Zn2SnO4, ZTO) films is presented in this paper. Nanocrystals of zinc oxide (ZnO) and tin dioxide (SnO2) are prepared by chemical vapor synthesis (CVS) and processed into stable aqueous dispersions including mixed colloids. These coll...

Hierarchical zirconium silicate macrospheres with diameters in the range 1.7 ÷ 1.8 mm were synthesized by spray gelling technique using a multi-templating method. Inexpensive, environmentally benign and easily accessible natural resources (yeast, gelatin, agar and chitosan) were used as templat...

A series of sodium polyacrylate copolymers (i.e., poly acrylic acid-co-itaconic acid-co-2-acrylamide-2-methylpropanesulfonic acid or PSIA with different molecular weights and monomer molar ratios) were synthesized based on acrylic acid-co-itaconic acid (PAI) as water-based dispersants for ultraf...

Li2O–ZrO2–SiO2: Ho3+ glasses mixed with Nb2O5 were prepared. Optical absorption and photoluminescence spectra of these glasses have been recorded at room temperature. The optical absorption spectra of all glasses recorded at room temperature in the wavelength region 300-2000 nm exhibited sever...

ObjectiveThe study is aimed to evaluate the two single commercially available two-step lithium-(di)silicate systems by analyzing their parent glass composition and studying the quantitative crystalline and glass phase evolution during the second stage heat-treatment. The mechanical repercussions...

ObjectivesNew lithium silicate/disilicate hot-pressed glass-ceramics are introduced into the dental market. It is known that the mechanical properties of this material depend on the microstructure, chemical composition, glass matrix, morphology of crystals, volume ratio crystal/glass, additive, ...

Statement of problemThe improved esthetics of ceramic dental prostheses has increased their popularity, although their high elastic modulus and low fracture toughness and tensile strength may reduce the long-term performance of dental prostheses.

The main aim of this study was to evaluate the physicochemical and biological behavior of (LZS) lithium-zirconium and (LZSA) lithium-zirconium-alumina silicate glass-ceramics. LZS and LZSA silicate glass-ceramics were produced from commercial raw materials by melting (1550 °C/2 h) followed by w...

Glasses and glass ceramics in the ternary xEu2O3·(100 − x)[7TeO2·3P2O5] systems with 0 ⩽ x ⩽ 60 mol% have been prepared from melt quenching method. Influence of europium ions on structural behavior in phosphate–tellurate glasses has been investigated using infrared spectroscopy.The addition o...

The potential of molybdenum substances to cause genotoxic effects has been studied previously. However, a review of existing in vitro data, including an assessment of relevance and reliability, has shown that inconsistent results have been observed in the past. To resolve the inconsistencies, ne...

The preparation of (i) fluorooxalatogermanates, M2[GeF2(C2O4)2]·xH2O, where M = Na and K, and x = 5.5 and 1.5, (ii) fluorooxalatostannates, K2[SnF2(C2O4)2] · 3H2O and K2[SnF4(C2O4)] · 6.5H2O, K2[Sn2F2(C2O4)6] · 2H2O, K6[Sn2F4(C2O4)5] · 2H2O, and (iii) hexafluorostannates, (BH)2[SnF6] ·xH2O...

We report a novel technique to fabricate bismuth stannate/[email protected] chloride (Bi2Sn2O7/[email protected]) films on conventional glass substrates. The film exhibited a remarkable self-cleaning capability against organic dyes under visible light. Porous Bi2Sn2O7 (BSO) film was first sinter...

Dehydration of glycerol was carried out using rubidium- and caesium-doped silicotungstic acid catalysts. These catalysts were prepared by varying concentration of the dopant metal cations while keeping the concentration of heteropoly acid unchanged. High acrolein selectivity (94–96%) was observ...

A series of Cs exchanged silicotungstic acid (STA) catalysts were prepared and their physico-chemical properties were derived from FT-Infrared, X-ray diffraction, Laser Raman, temperature programmed desorption of ammonia and BET surface area. The characterization results revealed that the Keggin...