The mechanically induced self-propagating reaction (MSR) and hot-pressing consolidation were adapted to synthesize Ti2AlC and Ti3AlC2 using Ti, C and Al powder mixtures. The effects of Al content on the microstructure and mechanical properties of fully dense Ti2AlC and Ti3AlC2 were investigated. The results reveal that the Ti3AlC2, TiC and TiAlx transitional phases were formed by mechanically alloying according to the mechanically induced self-propagating reactions (MSR). Through hot pressing the as-milled powders with initial composition of 2Ti/1.5Al/C and 2Ti/Al/C, respectively, at 1100°C for 1 h, the desired high purity Ti2AlC and Ti3AlC2 were produced. SEM images confirmed that the as-fabricated Ti2AlC and Ti3AlC2 grains are plate-like with nanoscale layered structure and dispersed uniformly.
Single phases of TbxY1-x Al3(BO3)4(0≤x≤0.2)phosphors were synthesized by a sol-gel combustion method with citric acid as fuel and complexing agent. Our method involves only exothermic decomposition of an aqueous citrate–nitrate gel and the gel yielded nanocrystalline TbxY1-x Al3(BO3)4 phosphors at 1000°C, without any formation of intermediate phase. The optimal doping concentration of Tb3+ ions in the serials was found to be approximately 12mol%. The decomposition of the gel was investigated by TG–DTA. The product has been further characterized by X-ray powder diffractometry (XRD) and fluorescent divide spectroscopy (FDS).
A method has been forward to measure the samll vibration based on Michelson Interferometer, and the Doppler Effect is under consideration.The information about vibration can be detected by the photo detector and display on the digital oscilloscope at the same time.
The absorption factor of the wafer is defined as the fraction of incident electromagnetic irradiance that is absorbed by the wafer.The absorption factor is derived from refractive index and the extinction coefficient of the wafer theoretically.Based on our analysis ,the absorption efficiency of the muti-layer configuration will be higher than the individual one at the same condition.
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