DC-magnetron sputtering was employed to prepare Fe-N/Ti-N periodic nano-multilayers . Magnetic properties were studied by vibrating sample magnetometry and structure by TEM and X-ray diffraction for the films. A stron...DC-magnetron sputtering was employed to prepare Fe-N/Ti-N periodic nano-multilayers . Magnetic properties were studied by vibrating sample magnetometry and structure by TEM and X-ray diffraction for the films. A strong enhancement of the saturation magnetization was found in multilayers containing thinner Fe-N layers. The coercivity was found to be nearly constant. A kind of anomalous hysteresis loops was found in some展开更多
Low temperature deposition (LTD) is an actual frontier in materials sicence and engineering, especially for thin film technology. In this paper the fundamentals and processing of low temperature deposition of TiN coat...Low temperature deposition (LTD) is an actual frontier in materials sicence and engineering, especially for thin film technology. In this paper the fundamentals and processing of low temperature deposition of TiN coating are reviewed. The prerequisites of a low temperature deposition process are enough good densification, hardness and adhesion of the deposited coating. The fundamentals of low temperature deposition are structure zone model and nonequilibrium plasma vapor growth in a combined DC and pulsed electromagnetic fields, namely a combination of a DC bias voltage superimposed by a DC pulsed bias voltage with variable frequency and peak voltage height. Low temperature deposition processing can be realized simply with only stationary electric fields. However, sensitivity of the product quality to the process parameters is the main barrier of this processing in the way to mass production. Low temperature deposition processing using the effects of a combined DC and pulsed electromagnetic fields has attained some promising results for the future commercialization. But they need still further systematic and deep study. The application of low temperature deposition processing is not limited in range of low melting substrate materials. It is also important for internal stress control, defect minimization, microstructure densification and performance improvement for coatings on broad spectrum of substrate materials as well as for different types of applications.展开更多
Layered double hydroxides(LDHs)pillared with heteropolyoxometalate have been synthesized via both restructuring of hydrotalcite-like compounds and direct anion exchange under microwave field.LDHs and their derivatives...Layered double hydroxides(LDHs)pillared with heteropolyoxometalate have been synthesized via both restructuring of hydrotalcite-like compounds and direct anion exchange under microwave field.LDHs and their derivatives are both found to be efficient for alkylation of isobutane with butene with a higher butene conversion and selectivity towards Cso展开更多
文摘DC-magnetron sputtering was employed to prepare Fe-N/Ti-N periodic nano-multilayers . Magnetic properties were studied by vibrating sample magnetometry and structure by TEM and X-ray diffraction for the films. A strong enhancement of the saturation magnetization was found in multilayers containing thinner Fe-N layers. The coercivity was found to be nearly constant. A kind of anomalous hysteresis loops was found in some
文摘Low temperature deposition (LTD) is an actual frontier in materials sicence and engineering, especially for thin film technology. In this paper the fundamentals and processing of low temperature deposition of TiN coating are reviewed. The prerequisites of a low temperature deposition process are enough good densification, hardness and adhesion of the deposited coating. The fundamentals of low temperature deposition are structure zone model and nonequilibrium plasma vapor growth in a combined DC and pulsed electromagnetic fields, namely a combination of a DC bias voltage superimposed by a DC pulsed bias voltage with variable frequency and peak voltage height. Low temperature deposition processing can be realized simply with only stationary electric fields. However, sensitivity of the product quality to the process parameters is the main barrier of this processing in the way to mass production. Low temperature deposition processing using the effects of a combined DC and pulsed electromagnetic fields has attained some promising results for the future commercialization. But they need still further systematic and deep study. The application of low temperature deposition processing is not limited in range of low melting substrate materials. It is also important for internal stress control, defect minimization, microstructure densification and performance improvement for coatings on broad spectrum of substrate materials as well as for different types of applications.
文摘Layered double hydroxides(LDHs)pillared with heteropolyoxometalate have been synthesized via both restructuring of hydrotalcite-like compounds and direct anion exchange under microwave field.LDHs and their derivatives are both found to be efficient for alkylation of isobutane with butene with a higher butene conversion and selectivity towards Cso
