La1-xSrxCo1-yFeyO3 cathode materials for solid oxide fuel cells were prepared by the microwave synthesis method.The reaction mechanism was studied using a thermal analysis method.The influences of microwave synthesis ...La1-xSrxCo1-yFeyO3 cathode materials for solid oxide fuel cells were prepared by the microwave synthesis method.The reaction mechanism was studied using a thermal analysis method.The influences of microwave synthesis conditions were examined and the characteristics of the samples were determined by X-ray diffraction and scanning electron microscopy.It was found that the optimum conditions were the microwave power of 800 W and the reaction time of 40 min.Samples with perosvkite-type crystal structure were obtained.The samples consist of uniformly distributed internal particles and the particle size is less than 1 μm.展开更多
In order to reduce the oxidation and volatilization caused by Mg element in the traditional methods for synthesizing Mg2Si compounds,Mg2Si thermoelectric materials were prepared by solid state reaction and microwave r...In order to reduce the oxidation and volatilization caused by Mg element in the traditional methods for synthesizing Mg2Si compounds,Mg2Si thermoelectric materials were prepared by solid state reaction and microwave radiation techniques.Structure and phase composition of the materials were investigated by X-ray diffraction.The electrical conductivity,Seebeck coefficient and thermal conductivity were measured as a function of temperature from 300 to 700 K.It is found that high purity Mg2Si powders can be obtained with excessive content of 8% Mg from the stoichiometric Mg2Si at 853 K and 2.5 kW for 30 min.A maximum dimensionless figure of merit,ZT,of about 0.13 was obtained for Mg2Si at 600 K.展开更多
In order to reduce the oxidizing and volatilizing caused by Mg element in the traditional methods for synthesizing Mg2Sil-xSnx （x=0.2, 0.4, 0.6, 0.8） solid solutions, microwave irradiation techniques were used in pr...In order to reduce the oxidizing and volatilizing caused by Mg element in the traditional methods for synthesizing Mg2Sil-xSnx （x=0.2, 0.4, 0.6, 0.8） solid solutions, microwave irradiation techniques were used in preparing them as thermoelectric materials. Structure and phase composition of the obtained materials were investigated by X-ray diffraction （XRD）. The electrical conductivity, Seebeck coefficient and thermal conductivity were measured as a function of temperature from 300 to 750 K. It is found that Mg2Si1-xSnx solid solutions are well formed with excessive content of 5% （molar fraction） Mg from the stoichiometric MgESil.xSnx under microwave irradiation. A maximum dimensionless figure of merit, ZT, of about 0.26 is obtained for Mg2Si1-xSnx solid solutions at about 500 K for x=0.6.展开更多
It is observed contamination and subsequent growth of various types of mycotoxins in the production and processing of grain and non-grain crops. The contamination of grain and non-grain cereals crops harvest was analy...It is observed contamination and subsequent growth of various types of mycotoxins in the production and processing of grain and non-grain crops. The contamination of grain and non-grain cereals crops harvest was analyzed. The aim of this research is using of microwave energy to disinfect grains of harvest and giving new properties to the grains and plants materials. The author has presented researches of the grains disinfection, during seedbed preparation and post processing. Rational parameters of heating rates of different biological objects were identified, revealed their dependence and impact on infection pathogens, through using of microwave energy technology. The author found a reduction of the number of pathogenic microbes and organisms at the various stages of processing agricultural products during using of microwave energy, and found new qualitative indicators of the products properties.展开更多
用高分子分散及微波-固相复合加热技术合成了层状锂离子电池正极材料L iN i0.5Co0.5O2.采用循环伏安、充放电循环、扫描电子显微镜(SEM)以及X射线粉末衍射(XRD)等测试技术,研究了煅烧条件对材料微观形貌、相结构以及电化学性能的影响规...用高分子分散及微波-固相复合加热技术合成了层状锂离子电池正极材料L iN i0.5Co0.5O2.采用循环伏安、充放电循环、扫描电子显微镜(SEM)以及X射线粉末衍射(XRD)等测试技术,研究了煅烧条件对材料微观形貌、相结构以及电化学性能的影响规律.研究结果表明:在750℃煅烧4 h即可得到形状为类球形的纯相层状L iN i0.5Co0.5O2正极材料,该材料的最大放电容量达到154 mA.h/g,循环10周后放电容量仍保持在148 mA.h/g以上.展开更多
文摘La1-xSrxCo1-yFeyO3 cathode materials for solid oxide fuel cells were prepared by the microwave synthesis method.The reaction mechanism was studied using a thermal analysis method.The influences of microwave synthesis conditions were examined and the characteristics of the samples were determined by X-ray diffraction and scanning electron microscopy.It was found that the optimum conditions were the microwave power of 800 W and the reaction time of 40 min.Samples with perosvkite-type crystal structure were obtained.The samples consist of uniformly distributed internal particles and the particle size is less than 1 μm.
基金Project (2009BB4228) supported by the Natural Science Foundation Project of Chongqing Science and Technology Commission,ChinaProject (CK2010Z09) supported by the Research Foundation of Chongqing University of Science and Technology,China
文摘In order to reduce the oxidation and volatilization caused by Mg element in the traditional methods for synthesizing Mg2Si compounds,Mg2Si thermoelectric materials were prepared by solid state reaction and microwave radiation techniques.Structure and phase composition of the materials were investigated by X-ray diffraction.The electrical conductivity,Seebeck coefficient and thermal conductivity were measured as a function of temperature from 300 to 700 K.It is found that high purity Mg2Si powders can be obtained with excessive content of 8% Mg from the stoichiometric Mg2Si at 853 K and 2.5 kW for 30 min.A maximum dimensionless figure of merit,ZT,of about 0.13 was obtained for Mg2Si at 600 K.
基金Project(2009BB4228) supported by the Natural Science Foundation of Chongqing City,ChinaProject(CK2010Z09) supported by the Research Foundation of Chongqing University of Science and Technology,China
文摘In order to reduce the oxidizing and volatilizing caused by Mg element in the traditional methods for synthesizing Mg2Sil-xSnx （x=0.2, 0.4, 0.6, 0.8） solid solutions, microwave irradiation techniques were used in preparing them as thermoelectric materials. Structure and phase composition of the obtained materials were investigated by X-ray diffraction （XRD）. The electrical conductivity, Seebeck coefficient and thermal conductivity were measured as a function of temperature from 300 to 750 K. It is found that Mg2Si1-xSnx solid solutions are well formed with excessive content of 5% （molar fraction） Mg from the stoichiometric MgESil.xSnx under microwave irradiation. A maximum dimensionless figure of merit, ZT, of about 0.26 is obtained for Mg2Si1-xSnx solid solutions at about 500 K for x=0.6.
文摘It is observed contamination and subsequent growth of various types of mycotoxins in the production and processing of grain and non-grain crops. The contamination of grain and non-grain cereals crops harvest was analyzed. The aim of this research is using of microwave energy to disinfect grains of harvest and giving new properties to the grains and plants materials. The author has presented researches of the grains disinfection, during seedbed preparation and post processing. Rational parameters of heating rates of different biological objects were identified, revealed their dependence and impact on infection pathogens, through using of microwave energy technology. The author found a reduction of the number of pathogenic microbes and organisms at the various stages of processing agricultural products during using of microwave energy, and found new qualitative indicators of the products properties.
文摘用高分子分散及微波-固相复合加热技术合成了层状锂离子电池正极材料L iN i0.5Co0.5O2.采用循环伏安、充放电循环、扫描电子显微镜(SEM)以及X射线粉末衍射(XRD)等测试技术,研究了煅烧条件对材料微观形貌、相结构以及电化学性能的影响规律.研究结果表明:在750℃煅烧4 h即可得到形状为类球形的纯相层状L iN i0.5Co0.5O2正极材料,该材料的最大放电容量达到154 mA.h/g,循环10周后放电容量仍保持在148 mA.h/g以上.
