Moreover,0.4 % Co2O3 doping in the ceramic reduces approximate 100 ℃ of sintering temperature compared to that of the undoped ceramic. The 0.4 % Co2O3 doped 0.85PZT-0.15PZN compact ceramic with the gain size of 1.0～2.5 μm was obtained.
Borosilicate sintering aid,different rare-earth oxides have been doped into BaTiO3(BT)-Nb2O5-ZnO system in order to obtain the X7R materials sintered at intermediate temperature.
It's found that the samples of Ba(Ce0.08Ti0.92)O3 with excellent electric properties could be obtained by sintering at 1 490 ℃ for 2 hours,showing high relative dielectric constant up to 5 300,low dielectric loss 2.42% and high insulation resistivity 1.39×107 Ω·cm.
Steam produced during the decomposition process accelerated the sintering of MgO, and MgO with surface area as high as 412 m2 · g-1 was obtained through calcining its precursor in flowing dry nitrogen at 520°C for 4 h.
The fabrication procedure involved a double-sintering process in a rich-Mg environment.
Samples with the equally high density and matching superconducting properties were obtained as well by a triple sintering process of the MgB2 powder directly from Alfa Aesar.
The specific surface areas are different before sintering, and have a slight difference after sintering.
Besides, the impurity phase, tetracalcium phosphate, appeared during ultrasonic atomizing procedure, and can be completely removed after sintering at 650°C for 1 h.
The cryolite ratio of the commercial aluminum cell electrolyte was determined by measuring the conductivity of the aqueous leaching solution ofthe sintered specimen which was prepared by adding quantitative sodiumfluoride into quantitative electrolyte specimen and then sintering it at 700℃.At the same time, the influence of the content of Al_2O_3. CaF_2. MgF_2 andLiF in the electroyte on the conductivity of the aqueous leaching solutionof the sintered specimen was studied. Furthermore, the dependence of...
The cryolite ratio of the commercial aluminum cell electrolyte was determined by measuring the conductivity of the aqueous leaching solution ofthe sintered specimen which was prepared by adding quantitative sodiumfluoride into quantitative electrolyte specimen and then sintering it at 700℃.At the same time, the influence of the content of Al_2O_3. CaF_2. MgF_2 andLiF in the electroyte on the conductivity of the aqueous leaching solutionof the sintered specimen was studied. Furthermore, the dependence of thetemperature coefficient of the conductivity of the aqueons leaching solutionon the excess AlF_3 content in electrolyte specimen was determined by regression analysis. At last, the formula to calculate the cryolite ratio of thealuminum electrolyte with was derived. Data resulting from the ‘conductivity-method’ were checked against the thermo--titrimetic method. The average difference was about 0.02 between them. The researeh shows, the improved‘conductivity--method’ can be well used in the measurement of the cryoliteratio of the commercial aluminum cell bath.
The photoelectrochemical properties of n-type semiconductor CdS_(1-x) Sex (X=0.05, 0.1, 0.15, 0.3, 0.5) liquid junction photoelectrochemical cell prepared bypowder sintering pressed electrodes are described in this paper. The cell is representedasCdS_(1-x) Se_x/1M Na_2S, 1MNaOH, 0.1M (or 1M) S/Pt. The electrodes were analysed by means of X-ray diffraction and the scanning elec-tron microscope. The optical to electrical energy conversion efficiencies (η) under dif-ferent light intensities and direct sunlight...
The photoelectrochemical properties of n-type semiconductor CdS_(1-x) Sex (X=0.05, 0.1, 0.15, 0.3, 0.5) liquid junction photoelectrochemical cell prepared bypowder sintering pressed electrodes are described in this paper. The cell is representedasCdS_(1-x) Se_x/1M Na_2S, 1MNaOH, 0.1M (or 1M) S/Pt. The electrodes were analysed by means of X-ray diffraction and the scanning elec-tron microscope. The optical to electrical energy conversion efficiencies (η) under dif-ferent light intensities and direct sunlight irradiation were measured. The Conversionefficiencies obtained were about 3.2% for solar intensity of 43mw/cm~2, and 3.28%for light intensity of 75mw/cm~2. Besides, the influence of the etchants on the electrode be-havior was investigated. No photoanodic dissolution was found for the Cds_(0.085)Se_(0.15)electrode in an electrolyte consisting of 1.0M NaOH, 1.0MNa_2S, and 1.0MS within 7hrs. The current-voltage characteristics curves (Ⅰ-Ⅴ) and the anodic current-potentialcurves (Ⅰ-Ф) were recorded directly under solar irradiation.
The sample was prepared by sintering coprecipitation mixtures,of com- position (X/2)Gd_2O_3+(1-x) BaO+6Fe_2O_3,at different temperature,The phase composition of sample and the phase transition during sintering pro- cess were studied by X-ray and magnetic analysis,The Gd content in sample were determined by thermoneutron transmission,The pure M structure was obtained bysintering at 1310℃ when x≤0.12,X structure (when x≤0.15) or W structure (when 0.4≤x≤0.6) was obtained by firing at 1400℃.M(?)ssbauer,...
The sample was prepared by sintering coprecipitation mixtures,of com- position (X/2)Gd_2O_3+(1-x) BaO+6Fe_2O_3,at different temperature,The phase composition of sample and the phase transition during sintering pro- cess were studied by X-ray and magnetic analysis,The Gd content in sample were determined by thermoneutron transmission,The pure M structure was obtained bysintering at 1310℃ when x≤0.12,X structure (when x≤0.15) or W structure (when 0.4≤x≤0.6) was obtained by firing at 1400℃.M(?)ssbauer, magnetic and electric measurements were carried out,For X structure,the magnetocrystalline anisotropy constant increased with x at room temperature. The Curie temperature of the sample with Wstructure was found about 80℃ higher then reported data,The effect of Gd~(3+) on the magnetic properties and the resistivity,and the interaction between Gd~(3+) and Fe~(3+) in M-type phase,of composition Ba_(0.9)Gd_(0.1)Fe_(12)O_(19),were discussed.
采用草酸盐共沉淀工艺制备了组成为(χ/2)Gd_2O_3+(1-χ)BaO+6Fe_2O_3的草酸盐粉料,预烧、成型后在不同温度下进行烧结。用热中子透射法测定了样品中的含钆量。用 X 射线衍射物相分析和磁分析方法研究了烧结过程中生成物的相组成及其相变。当χ≤0.12时,在1310℃烧结得到纯 M 相。在1400℃烧结得到的样品中,当χ≤0.15时为 X 相;当0.4≤χ≤0.6时主要相为 W 相。测量了样品的磁性、电阻率和 M(?)ssbauer 谱。发现在 X 结构化合物中,室温下的磁晶各向异性常数随含钆量的增加而增加;W 相化合物的居里温度比文献报导的数据高80℃左右。讨论了在含钆的 M 型六角铁氧体中,Gd~(3+)对磁性和电阻率的影响,以及 Gd~(3+)和 Fe~(3+)间的交换作用。
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