晶体

Key words: sodium yttrium tungstate crystal doped with neodymium; Raman spectra; absorption spectrum; Czochralski method

为此，采用提拉法生长了 Nd ， NYW 晶体，分析了晶体的红外光谱、 Raman 光谱和吸收光谱。

The sharp drop in the resistance at T\-m has been associated with the first order melting transition.

1引 言在高温超导体相图中由于热涨落和强的各向异性的影响，存在一个磁通液相，在干净的样品中这个液相沿着融化曲线Tm经过一级相变转变成涡漩线&晶体&。

Our company offers you a very wide range of optical lenses, including spherical lenses, cylindrical lenses, aspherical lenses, windows, prisms, crystal, mirrors and high precision optical samples etc. In addition, we specilize in customizing photographic lenses and accessories, such as telephoto lens, projector lens, fisheye lens etc.

我们公司为您提供了非常广泛的光学镜头，包括球面镜片，圆柱镜头，片非球面镜片，窗户，棱镜，晶体，镜子和高精密光学样品等此外，我们在定制specilize摄影镜头和配件，如远摄镜头，投影镜头，鱼眼镜头， etc。

The α-BaB〓O〓 crystal is colorless, transparent and without cracking. The cracking problem has been overcome by a special growth procedure. The dislocation density, crystallization morphology and growth habit of α-BaB〓O〓 crystal have been systematically studied by chemical etching method, X-ray laue orientation of synchrotron radiation, double-crystal diffraction topography. The growth striation and irregular dislocation consist of the primary defect in α-BaB〓O〓 crystal. The convex solid-liquid interface is stable during the whole growth process.

在国际上首次采用提拉法生长出φ50×40mm〓的α-BaB〓O〓晶体，生长方向为[0001]，晶体完整、无色透明；提出了三种固相反应的原料制备方法，并保证B〓O〓过量1mol%；采用独特的生长装置和程序有效地解决了α-BaB〓O〓晶体易开裂的问题；首先采用化学腐蚀法、白光X射线衍射术、X射线双晶衍射形貌术等研究了α-BaB〓O〓晶体的位错密度；首次采用同步辐射X射线劳埃定向术研究了α-BaB〓O〓晶体的结晶形态及生长习性；结果发现α-BaB〓O〓晶体的缺陷以位错为主，部分α-BaB〓O〓晶体中存在生长条纹。

As of Tuesday, Google's results were still censored in China.

截至周二，谷歌的搜索结果仍受中国审查。

In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.

在这一过程中，人的主体性发挥是社会有机体健康发展的灵魂。