Phosphine(PH3)is an important electronic specific gas which is mainly used in fields of N-type semiconductor doping,ion implement and chemical vapor deposition(CVD) etc.
The results indi-cate that La_(1-x)Sr_xFeO_3 is a kind of n-type semiconducting ceramics,the resistanceof LaFeO_3 decreases with the increase of R. H. ,on the other hand,the resistanceof La_(1-x)Sr_xFeO_3(0.1≤x≤0.3)increases with the increase of R.
结果表明,La_(1-x)Sr_xFeO_3是一种 n 型半导瓷,LaFeO_3具有负湿阻特性,而 La_(1-x)Sr_xFeO_3(0.1≤x≤0.4)却具有正湿阻特性,且其感湿灵敏度随 Sr 取代量的增加而增大。
The characterization of structure and spectra for modified TiO_2 was made. And a new mechanism of enhanced activity was elucidated. 1. Nanoscale TiO_2 powders doping with V~(5+), Nb~(5+),Ta~(5+), Cr~(6+), Mo~(6+), W~(6+) ions were prepared using TiCl3 as a source matter.
Since wavelet bases are not available for this general setting, the new idea used here is to apply the discrete Calderón-type reproducing formula associated to para-accretive functions developed in [14].
However, the ECV measurement of dopant concentration in the underlying lightly doped n-type substrate is significantly influenced by the upper heavily-doped layer.
Segmentation of p-n junction was performed by implantation of boron (for the n-type Ge) and mechanical grooving of the Li diffusion layer (for the p-type Ge).
By the optimization method and the calculating with geometric parameters of gears, we have attempted to raise the efficiency of involute drive model N. Results show that for 1 tooth difference the meshing efficiency η_e>0.93, and for 2~4 tooth difference the meshing efficiency η_e>0.97, provided the h_a~(?), x_1 and a′ are well taken. The efficiency term, η, was expressed in an approximate form as η≈η_e·η_p·η_b, where η_e, and η_p were again expressed in empirical forms and the highest efficiency was taken ...
In conventional process of nonmetal electroless plating, precious metals such as Pd and Ag are used as catalyst agents, and, only after the catalytic activated metal crystal nuclei are formed on nonmetal surface through sensitization and activation treatments, then electroless plating can be done. But it is too expensive, the solution is unstable, the operation is heavy and complicated and is hard to control. N type semiconductor oxides, such as ZnO, MgO, Ni_2O_3 and SnO_2, are there- fore tested to be used...
By using solid phase reaction method,perovskite-type La_(1-x)Sr_xFe_3(0≤x≤0.7)electronic ceramics were synthesized in oxygen atmosphere.Their resistance vs relativehumidity(R.H.)characteristics as well as dielectric and complex impedance spectrawere investigated.The experimental results were analyzed and discussed by non-De-bye model,and the equivalent circuit parameters were calculated.The results indi-cate that La_(1-x)Sr_xFeO_3 is a kind of n-type semiconducting ceramics,the resistanceof LaFeO_3 decrease...
本工作用固相反应法,合成了 La_(1-x)Sr_xFeO_3(0≤x≤0.7)系电子陶瓷,考察了配方对其湿敏性能的影响,用阻抗分析仪测试了材料的介电谱和复阻抗谱,用非德拜模型对其电特性进行了分析讨论,并推导了等效电路的有关参量。结果表明,La_(1-x)Sr_xFeO_3是一种 n 型半导瓷,LaFeO_3具有负湿阻特性,而 La_(1-x)Sr_xFeO_3(0.1≤x≤0.4)却具有正湿阻特性,且其感湿灵敏度随 Sr 取代量的增加而增大。