ZnO-B2O3-SiO2 additive with 0.55: 0.35: 0.10 molar ratio was added to Ba0.3Sr0.7TiO3 ceramics in order to lower the sintering temperature. The densification behavior, crystalline structure, microstructure, dielectric ...
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ZnO-B2O3-SiO2 additive with 0.55: 0.35: 0.10 molar ratio was added to Ba0.3Sr0.7TiO3 ceramics in order to lower the sintering temperature. The densification behavior, crystalline structure, microstructure, dielectric properties and breakdown strength of ceramics were studied. When 9 wt.% additive was mixed with pure Ba0.3Sr0.7TiO3 powder, the densification temperature of samples decreased from 1350°C to 1100°C compared with no additive system, and the sintered ceramics revealed dielectric properties at room temperature as follows: dielectric constant Εr = 413, dielectric loss tanδ = 0.00231 under 1 kHz and the breakdown strength Eb = 9.2 kV/mm.
In this paper, Fe-Mn-Cu-Co spinel materials with high infrared radiation property were prepared by doping TiO2. The microstructure and infrared radiation with different doping contents of TiO2 were studied. The result...
In this paper, Fe-Mn-Cu-Co spinel materials with high infrared radiation property were prepared by doping TiO2. The microstructure and infrared radiation with different doping contents of TiO2 were studied. The results show that infrared radiation of spinel materials were increased by doping TiO2 and the infrared absorption intensities of diesel oil in the ranges of 3000-2800 and 1500-1300 cm−1 were increased after activated by spinel materials. Diesel surface tension and viscosity were reduced after adding the spinels. When the doping amount of TiO2 was 10%, the effects on the decrease of the surface tension and viscosity reached the maximum.
One-dimensional (1D) anatase TiO2 nanostructures such as nanotubes, nanorods and nanobelts were synthesized by hydrothermal method. These TiO2 nanomaterials with different morphology were used to photocatalytically de...
One-dimensional (1D) anatase TiO2 nanostructures such as nanotubes, nanorods and nanobelts were synthesized by hydrothermal method. These TiO2 nanomaterials with different morphology were used to photocatalytically degrade gaseous benzene with P25 as a comparison. the prepared 1D TiO2 were characterized by XRD, TEM and BET, and the degraded efficiency of benzene and the production of CO2 were detected by Gas Chromatograph. The results showed that the morphology difference led to a significant variation of photocatalytic performance for degradation of gaseous benzene, with the activity order as follows: TiO2 nanotubes > TiO2 nanorods > TiO2 nanobelts > P25 TiO2.
Based on a facile glucose-guided hydrolyzing-heat-treating approach, urchin-like α-Fe2O3 nanomaterials with controllable morphology and crystallinity were prepared via adjusting the heat-treating temperature, and the...
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Based on a facile glucose-guided hydrolyzing-heat-treating approach, urchin-like α-Fe2O3 nanomaterials with controllable morphology and crystallinity were prepared via adjusting the heat-treating temperature, and their electrochemical performances were investigated. The results showed that changing the heat-treating temperature can effectively control the structure and electrochemical property of the as-made products. The urchin-like α-Fe2O3 nanomaterials obtained by heat-treating at 300°C, composed of a mass of the shuttle fibrous brunches, had higher initial discharge capacity(1475 mAhg-1) than those consisting of nanorods formed at 700°C. The above difference is ascribed to the urchin-like samples obtained at the relatively low heat-treating temperature, which, with low crystallinity, large SBET, and well-regulated porous, is helpful to the adsorption of electrolyte and the transport of lithium ion, resulting in the high activity and discharge-charge capacity.
In the present study, (1-x)(Sr_(0.88)Bi_(0.08))TiO_(3)-xBi(Mg_(0.5)Ti_(0.5))O_(3) (SBT-BMT) system was synthesized using conventional solid stateprocessing. X-ray diffraction (XRD) and SEM testings were employed to d...
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ISBN:
(纸本)9781457711626
In the present study, (1-x)(Sr_(0.88)Bi_(0.08))TiO_(3)-xBi(Mg_(0.5)Ti_(0.5))O_(3) (SBT-BMT) system was synthesized using conventional solid stateprocessing. X-ray diffraction (XRD) and SEM testings were employed to determine the phase constitution and microstructure of ceramics. SBT-BMT ceramics exhibited moderate dielectric permittivities ((epsilon)_(r)) (>1100 at RT) and low dielectric loss (0.07percent) over the temperature range from -20 to 200 deg C, with flat temperature coefficients of permittivity. In addition, SBT-BMT ceramics were observed to possess dielectric relaxation characteristics and energy densities, being on the order of 1.4 J/cm~(3) at 180 kV/cm was observed for the 0.8S_(0.88)B_(0.08)T-0.2BMT ceramics.
In order to verify the effect of CRP(continuous rheoconversion process) in the preparation of magnesium alloy semisolid billets,AM60 alloy billets were fabricated with CRP,and effects of pouring temperature,slope angl...
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In order to verify the effect of CRP(continuous rheoconversion process) in the preparation of magnesium alloy semisolid billets,AM60 alloy billets were fabricated with CRP,and effects of pouring temperature,slope angle,and length of the reactor on the microstructure of AM60 alloy were *** results show that the grain size is reduced with the decrease of pouring temperature.A small block/rosette grain is obtained when the pouring temperature is less than 680 °***,the available temperature process interval/window has to be *** change slope angle of reactor(from 30° to 45°) is helpful for formation of the small and block/rosette ***,the reactor with a length of 500 mm is enough for copious nucleation of primary *** changes the solidification microstructure of billets by controlling the nucleation and growth of the primary phase in melt.
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