铌

Keywords near stoichiometric;lithium niobate;absorption spectrum;photorefractive effect;top-seed solution method

近化学计量比；铌酸锂；吸收光谱；衍射效率；顶部籽晶法

In an ultrahigh vacuum chamber with a base pressure of 1 x 10-10 torr, we have used Low Energy Electron Diffraction and Temperature Programmed Auger to study the effect of adsorbates on the surface structure of Nb(111). That is, in O/Nb(111) systems, we observe the structure of the surface with LEED to see if any surface reconstruction occurs after annealing and analyze the structure.

在超高真空(约1 x 10-10 torr)的环境下，我们利用了低能量电子绕射(Low Energy Electron Diffraction， LEED)、可程式控温欧杰能谱(Temperature Programmed Auger， TPA)，来研究氧覆盖层对於铌基板的影响，亦即PO/Nb(111)表面系统中，再利用LEED观察是否有任何表面重构的现象发生并详细分析此结构。

FREDERICTON, NB -- A new type of wide tires that reduce greenhouse gas emissions by transport trucks can now operate on certain New Brunswick highways under .

fredericton ，铌-一种新型的宽轮胎，减少温室气体排放量的运输卡车，现在可以经营某些新不伦瑞克省公路下。

H.C. Starck produces an assortment of refractory metal powders that is unique the world over, In addition to metal powders, semi-finished and finished molybdenum, tungsten, tantalum, niobium, titanium, zirconium and nickel products and their alloys are manufactured.H.C.

H.C。 Starck是全世界独占鳌头的生产一系列各种各样难熔金属粉末的生产商。除了生产金属粉末外， H.C。 Starck也生产钼、钨、铌、钛、锆、镍等的半成品和成品加工件以及它们的合金。H.C。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。