采用固相法制备BiFeO_3-x[BSN-G](x=0~5.0wt%)陶瓷样品,研究添加不同量的BSN-G对Bi FeO_3陶瓷微观形貌,电性能及磁性能的影响。研究结果表明:BSN-G的加入使得陶瓷样品气孔率降低,致密度提高。随着x的增加,陶瓷的介电常数和介电损耗呈逐...采用固相法制备BiFeO_3-x[BSN-G](x=0~5.0wt%)陶瓷样品,研究添加不同量的BSN-G对Bi FeO_3陶瓷微观形貌,电性能及磁性能的影响。研究结果表明:BSN-G的加入使得陶瓷样品气孔率降低,致密度提高。随着x的增加,陶瓷的介电常数和介电损耗呈逐渐降低趋势,当x=5%时,样品在1 k Hz频率下的介电损耗为0.003。此外,添加BSN-G使得BiFeO_3陶瓷的漏导电流降低,x=5%的样品具有饱和的电滞回线,其饱和极化强度PS为1.5μC/cm^2,漏导电流密度J为0.39×10-6A/cm^2。交流阻抗图谱分析表明随着x的增加,样品的电阻呈增大趋势。活化能Ea随x增加而依次降低,进一步说明其损耗呈逐渐降低趋势。随着x的增加,样品的磁性能得到一定改善。展开更多
The effects of Y addition on the structural and mechanical properties of CuZrAl bulk metallic glass（BMG） were studied.The results show that the glass forming ability of CuZrAl system is improved by the addition of Y...The effects of Y addition on the structural and mechanical properties of CuZrAl bulk metallic glass（BMG） were studied.The results show that the glass forming ability of CuZrAl system is improved by the addition of Y and the fracture strength decreases with Y addition due to the reduction of binding energy induced by Y.The fracture surface is dominated by vein-like patterns in Cu45Zr48Al7 bulk metallic glass,and changes to smooth regions in Cu46Zr42Al7Y5 BMG.TEM observation shows that Cu45Zr48Al7 BMG has a composite microstructure of nanocrystalline phases dispersed in amorphous matrix.However,the Cu46Zr42Al7Y5 BMG shows a fully amorphous structure.展开更多
Grate fly ash and fluidized bed fly ash mixed with glass cullet additive respectively were melted in the electronic arc-furnace. The product, arc-melting slag, was further treated by crushing, pressing and heat treatm...Grate fly ash and fluidized bed fly ash mixed with glass cullet additive respectively were melted in the electronic arc-furnace. The product, arc-melting slag, was further treated by crushing, pressing and heat treatment in order to make the glass-ceramics. The crystallization behaviors of the produced glass-ceramics were examined by differential thermal analysis （DTA）, X-ray diffractometry （XRD） and scanning electron microscopy （SEM）. Results show that main crystalline phase of the glass-ceramics fi＇om grate fly ash is wollastonite （CaSiO3） with small amount of diopside （Ca（Mg,Al）（Si,Al）206）, and that from fluidized bed fly ash is diopside （Ca（Mg,Al）（Si,Al）206）. It is found that the glass-ceramics sintered at 850 ℃and 1 000℃ from grate fly ash and fluidized bed fly ash respectively have the optimal physical, mechanical and chemical characteristics. Glass-ceramics samples, produced from incinerator fly ash with desirable properties and the low leaching concentration of heavy metals, can be the substitute of nature materials such as marble, granite and porcelain tiles.展开更多
文摘采用固相法制备BiFeO_3-x[BSN-G](x=0~5.0wt%)陶瓷样品,研究添加不同量的BSN-G对Bi FeO_3陶瓷微观形貌,电性能及磁性能的影响。研究结果表明:BSN-G的加入使得陶瓷样品气孔率降低,致密度提高。随着x的增加,陶瓷的介电常数和介电损耗呈逐渐降低趋势,当x=5%时,样品在1 k Hz频率下的介电损耗为0.003。此外,添加BSN-G使得BiFeO_3陶瓷的漏导电流降低,x=5%的样品具有饱和的电滞回线,其饱和极化强度PS为1.5μC/cm^2,漏导电流密度J为0.39×10-6A/cm^2。交流阻抗图谱分析表明随着x的增加,样品的电阻呈增大趋势。活化能Ea随x增加而依次降低,进一步说明其损耗呈逐渐降低趋势。随着x的增加,样品的磁性能得到一定改善。
基金Project (2010ZDJH10) supported by the NUST Research FundingProject (BK2007213) supported by the Natural Science Foundation of Jiangsu Province,China
文摘The effects of Y addition on the structural and mechanical properties of CuZrAl bulk metallic glass（BMG） were studied.The results show that the glass forming ability of CuZrAl system is improved by the addition of Y and the fracture strength decreases with Y addition due to the reduction of binding energy induced by Y.The fracture surface is dominated by vein-like patterns in Cu45Zr48Al7 bulk metallic glass,and changes to smooth regions in Cu46Zr42Al7Y5 BMG.TEM observation shows that Cu45Zr48Al7 BMG has a composite microstructure of nanocrystalline phases dispersed in amorphous matrix.However,the Cu46Zr42Al7Y5 BMG shows a fully amorphous structure.
基金Project(20806051) supported by the National Natural Science Foundation of ChinaProject(20080440680) supported by China Postdoctoral Science Foundation
文摘Grate fly ash and fluidized bed fly ash mixed with glass cullet additive respectively were melted in the electronic arc-furnace. The product, arc-melting slag, was further treated by crushing, pressing and heat treatment in order to make the glass-ceramics. The crystallization behaviors of the produced glass-ceramics were examined by differential thermal analysis （DTA）, X-ray diffractometry （XRD） and scanning electron microscopy （SEM）. Results show that main crystalline phase of the glass-ceramics fi＇om grate fly ash is wollastonite （CaSiO3） with small amount of diopside （Ca（Mg,Al）（Si,Al）206）, and that from fluidized bed fly ash is diopside （Ca（Mg,Al）（Si,Al）206）. It is found that the glass-ceramics sintered at 850 ℃and 1 000℃ from grate fly ash and fluidized bed fly ash respectively have the optimal physical, mechanical and chemical characteristics. Glass-ceramics samples, produced from incinerator fly ash with desirable properties and the low leaching concentration of heavy metals, can be the substitute of nature materials such as marble, granite and porcelain tiles.
