Tailoring of the Dielectric Properties of Some Low Sintering Temperature Ceramics

International audienc

Tailoring of the Dielectric Properties of Some Low Sintering Temperature Ceramics

International audienc

Tailoring of the Dielectric Properties of Some Low Sintering Temperature Ceramics

International audienc

Processing and dielectric properties of ZnTiO3 ceramics prepared from nanopowder synthesised by sol-gel technique

International audienceZnTiO3 nanopowders were obtained by sol-gel method. The nanopowders were characterised by means of TGA/DTA analysis, X-ray diffraction, TMA analysis and SEM characterisation. The results show that the crystalline structure of the sol-gel powders was obtained at 600°C, with crystallite sizes of 10 nm. SEM shows that most of the prepared ZnTiO3 nanopowders are agglomerated. Since agglomeration plays an important role in the sintering of the ZnTiO3 ceramics, different deagglomeration techniques (ultrasonication, pulverisation and attrition milling) were investigated. Dense ZnTiO3 structure was obtained from the attrition milled powder at 1050°C and its dielectric characteristics were also investigated (εr =25, tε= -26 ppm/°C and tgδ < 10-3 at 1 MHz). The low sintering temperature and the good dielectric properties show promise for the manufacture of multilayered capacitors with internal copper electrodes

Effects of the sintering atmosphere on the BaZn1/3Ta2/3O3 based Cu multilayer ceramic capacitors

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Effects of the sintering atmosphere on the BaZn1/3Ta2/3O3 based Cu multilayer ceramic capacitors

International audienc

Tuning of the Ba5Nb4O15 permittivity temperature coefficient

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Tuning of the Ba5Nb4O15 permittivity temperature coefficient

International audienc

Heterogeneous Fenton like degradation of olive Mill wastewater using ozone in the presence of BiFeO3 photocatalyst

International audienceThe possibility of coupling a physicochemical treatment (ozonation) with a heterogeneous Fenton-like using BiFeO3 nanocatalyst for the treatment of olive mill wastewaters (OMW) was investigated. BiFeO3 was successfully synthetized by sol-gel method and structural properties were characterized by X-ray (DRX), scanning electron microscope (SEM), Fourier Transform Infrared Spectroscopy FTIR and UV-vis diffuse reflectance spectroscopy. Different degradation systems were considered alone or in combination Ozone alone, BiFeO3 alone, O-3/BiFeO3, O-3/H2O2, O-3/H2O2/BiFeO3 and O-3/BiFeO3/S2O82-. Compared to the other systems, the degradation by O-3/BiFeO3/S2O82- in alkaline conditions appeared to be the most efficient, allowing to reach 82.9% and 98.0% reduction of the phenolic compounds and the COD respectively. High stability and reusability of the BiFeO3 particles was shown through four successive oxidation batches, confirming the promising performances of the O-3/BiFeO3/S2O82- system

Low temperature sintered ZnTio3 dielectric ceramics with temperature coefficient of dielectric constant near zero

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