Mo5Si3-20%Al2O3 （mass fraction） nanocomposite was synthesized by mechanical alloying （MA） of mixture of MoO3,Mo,Si and Al powders.The structural evolutions of powder particles during mechanical alloying were studi...Mo5Si3-20%Al2O3 （mass fraction） nanocomposite was synthesized by mechanical alloying （MA） of mixture of MoO3,Mo,Si and Al powders.The structural evolutions of powder particles during mechanical alloying were studied by X-ray diffractometry （XRD）,scanning electron microscopy （SEM）,transmission electron microscopy （TEM） and differential thermal analysis （DTA）.Results show that Mo5Si3-20%Al2O3 was obtained after 10 h of milling.The spontaneous reaction of powders takes place in an explosive mode.The crystallite sizes of Mo5Si3 and Al2O3 after milling for 30 h were 36.3 nm and 21.9 nm,respectively.With longer milling time,the intensities of Mo5Si3 and Al2O3 peaks decreased and became broad due to the decrease in crystallite size.Thermal analysis results and XRD analysis results show that the Mo5Si3-Al2O3 nanocomposite powders are very stable during milling （up to 30 h） and heating （up to 1 000℃） and no transformation takes place.展开更多
The lithium ion-conductive solid electrolyte in the oxide systems of Li2O-TiO2-SiO2-P2O5 and Li2O-TiO2-Al2O3-P2O5 was prepared by solid-state reaction. The electrolyte pellets by cold-pressing method is 13 mm in diame...The lithium ion-conductive solid electrolyte in the oxide systems of Li2O-TiO2-SiO2-P2O5 and Li2O-TiO2-Al2O3-P2O5 was prepared by solid-state reaction. The electrolyte pellets by cold-pressing method is 13 mm in diameter, about 1 mm in thickness. Phase identification and surface morphology of the products were carried out by X-ray diffraction and scanning electron microscopy. Ionic conductivity of the pellets was investigated through AC impedance. The results show that adulterate other cations can improve the ionic conductivity of the solid electrolyte. The maximum ionic conductivity in the samples is 9.912 × 10-4 S·cm-1 in the Li2O-TiO2-SiO2-P2O5 system.展开更多
基金Project(3ZS061-A25-038) supported by the Natural Science Foundation of Gansu Province,China
文摘Mo5Si3-20%Al2O3 （mass fraction） nanocomposite was synthesized by mechanical alloying （MA） of mixture of MoO3,Mo,Si and Al powders.The structural evolutions of powder particles during mechanical alloying were studied by X-ray diffractometry （XRD）,scanning electron microscopy （SEM）,transmission electron microscopy （TEM） and differential thermal analysis （DTA）.Results show that Mo5Si3-20%Al2O3 was obtained after 10 h of milling.The spontaneous reaction of powders takes place in an explosive mode.The crystallite sizes of Mo5Si3 and Al2O3 after milling for 30 h were 36.3 nm and 21.9 nm,respectively.With longer milling time,the intensities of Mo5Si3 and Al2O3 peaks decreased and became broad due to the decrease in crystallite size.Thermal analysis results and XRD analysis results show that the Mo5Si3-Al2O3 nanocomposite powders are very stable during milling （up to 30 h） and heating （up to 1 000℃） and no transformation takes place.
文摘The lithium ion-conductive solid electrolyte in the oxide systems of Li2O-TiO2-SiO2-P2O5 and Li2O-TiO2-Al2O3-P2O5 was prepared by solid-state reaction. The electrolyte pellets by cold-pressing method is 13 mm in diameter, about 1 mm in thickness. Phase identification and surface morphology of the products were carried out by X-ray diffraction and scanning electron microscopy. Ionic conductivity of the pellets was investigated through AC impedance. The results show that adulterate other cations can improve the ionic conductivity of the solid electrolyte. The maximum ionic conductivity in the samples is 9.912 × 10-4 S·cm-1 in the Li2O-TiO2-SiO2-P2O5 system.
