Superconducting vanadium nitride （VN） is successfully synthesized by a solid-state reaction of vanadium pentox- ide, sodium amide and sulfur in an autoclave at a relatively low temperature （240-400℃）. The obtaine...Superconducting vanadium nitride （VN） is successfully synthesized by a solid-state reaction of vanadium pentox- ide, sodium amide and sulfur in an autoclave at a relatively low temperature （240-400℃）. The obtained samples are characterized by x-ray diffraction, x-ray photoelectron spectroscopy and transmission electron microscopy. The result of the magnetization of the obtained VN product as a function of temperature indicates that the onset superconducting transition temperature is about 8.4K. Furthermore, the possible reaction mechanism is also discussed.展开更多
Under conditions of electric-arc low-temperature plasma (LTP), ultra-finely dis- persed Si3N4 particles have been synthesized by using silicon powder and nitrogen as raw materi- als. The prepared samples are character...Under conditions of electric-arc low-temperature plasma (LTP), ultra-finely dis- persed Si3N4 particles have been synthesized by using silicon powder and nitrogen as raw materi- als. The prepared samples are characterized by X-ray diffraction (XRD), scanning electron spec- troscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The result indicates that the basic phase in Si3N4 produced is α- and β-Si3N4. The particle size of Si3N4 sample is in the range of 30-500 nm.展开更多
基金Supported by the Natural Science Foundation of Jiangsu Province under Grant No BK20160292the Natural Science Foundation of the Higher Educations Institutions of Jiangsu Province under Grant No 16KJB150013+1 种基金the National Natural Science Foundation of China under Grant No U1404505the Program for Innovative Talent in University of Henan Province under Grant No16HASTIT010
文摘Superconducting vanadium nitride （VN） is successfully synthesized by a solid-state reaction of vanadium pentox- ide, sodium amide and sulfur in an autoclave at a relatively low temperature （240-400℃）. The obtained samples are characterized by x-ray diffraction, x-ray photoelectron spectroscopy and transmission electron microscopy. The result of the magnetization of the obtained VN product as a function of temperature indicates that the onset superconducting transition temperature is about 8.4K. Furthermore, the possible reaction mechanism is also discussed.
基金This work was supported by Foundation for University Key Teacher of Ministry of Education of China No. D 19902.
文摘Under conditions of electric-arc low-temperature plasma (LTP), ultra-finely dis- persed Si3N4 particles have been synthesized by using silicon powder and nitrogen as raw materi- als. The prepared samples are characterized by X-ray diffraction (XRD), scanning electron spec- troscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The result indicates that the basic phase in Si3N4 produced is α- and β-Si3N4. The particle size of Si3N4 sample is in the range of 30-500 nm.
