氧化锑/高岭土复合阻燃微粉的结构分析

用球磨法制备了氧化锑／高岭土复合阻燃微粉,采用Ｘ射线衍射（ＸＲＤ）、红外吸收光谱（ＩＲ）对复合微粉的结构进行了分析,ＸＲＤ分析表明：随着复合微粉组分的变化,高岭土和氧化锑的ＸＲＤ特征衍射吸收峰发生移动,衍射强度发生变化,相应晶面间距发生膨胀和收缩,晶格畸变明显。ＩＲ分析表明：随着复合组分的变化,高岭土和氧化锑的ＩＲ特征振动吸收峰发生红移、蓝移、振动消失等系列变化。     

Fabrication of gradient refractive index ball lenses

The theoretical model of the Maxwell fish eye sphere lens has long been regarded as an absolute optical instrument without practical application since it was proposed. But the study on the theory of Maxwell fish eye micro-spherical lens shows that at certain condition it has fine image formation ability and coupling efficiency. Based on the Fick's diffusion equations, the distribution function of refractive index of gradient refractive index (GRIN) ball lenses is derived. Lithium-containing silicate glass is fabricated and GRIN ball lenses whose diameters are from 0.3 to 3.0 mm are made by ion exchange and the sagging method in sodium nitrate. Radial refractive index profiles of these GRIN ball lens are measured by interferometer. Results show that the distribution of the index of refraction is a parabolic curve and in concordance with the computational consequence and its Δn is 0.0002.     

Investigation of impurity phase formation for (ZnO)1−x(TMO)x bulk samples formed by ball milling

Structural, compositional, optical and magnetic properties have been studied for polycrystalline (ZnO)_0.90(TMO)_0.10 bulk samples, where TM (transition metal ions) = Mn, Fe, and Co. The quantitative Rietveld analysis showed relatively higher percentage of impurity (spinel and oxide) phases of about 33.76, 52.38 and 55.61% for Mn, Fe and Co doped ZnO samples, respectively. The de-convolution of XPS spectra indicated the presence of different phases. The appearance of shaking satellites in XPS spectra confirmed the presence of different valence states of dopant ions. The red shift in energy band gap, estimated from reflectance UV-vis spectroscopy, was observed for all TM doped bulk samples. For Mn doping, paramagnetic behavior was obtained while for Co and Fe, weak ferromagnetic behavior was observed at room temperature.     

火焰原子吸收光谱法测定锡基焊料中锑

用盐酸 -过氧化氢溶解样品 ,加入酒石酸抑制锑的水解 ,空气 -乙炔火焰原子吸收光谱法测定锡基焊料中锑。并研究了样品制备方法及其共存元素的干扰。本法简便、快速 ,准确度及精密度均令人满意     

表面封装技术组件焊点热变形的云纹干涉法研究

表面封装技术组件的焊点作为唯一联接芯片载体与电路板基板之间的机械物，它在温度循环下的可靠性问题是人们普遍关注的焦点。本文通过在组件的不同部位复制１２００线／ｍｍ高频正交全息光栅，采用高灵敏度云纹干涉法测得了翼型引脚首尾两端的面内剪切位移，为阐述表面封装组件的疲劳损伤机理提供了可靠的实验数据。