掺氮金刚石的光学吸收与氮杂质含量的分析研究

Optical absorbance of diamond doped with nitrogen and the nitrogen concentration analysis

研究了金刚石光学特性与氮杂质及其含量的关系,从传统的金刚石氮含量标定方法出发,修正了金刚石氮含量的计算方法,并且用添加叠氮化钠的原料在六面顶压机上进行了高氮含量金刚石的制备研究.随着体系中叠氮化钠的添加,金刚石红外吸收谱在800—1400cm-1范围的吸收强度相对于基线不断升高,这表明金刚石中存在的氮含量在随着叠氮化钠添加而升高,金刚石在单声子区域吸收强度大大增强.用含叠氮化钠的原料制备的金刚石呈现绿色、墨绿色甚至黑色,颜色的深浅依赖于叠氮化钠添加的多少.傅里叶红外光谱测试结果表明,用含叠氮化钠的原料制备的金刚石的氮含量要远远高于普通制备金刚石的氮含量,氮含量升高到1450—1600ppm.氮杂质元素的增多将不利于金刚石的光谱透过性,然而这种掺杂金刚石可以作为某些波段的多功能吸收辐射材料.

The combination of outstanding properties, such as high thermal conductivity, high refractive index, extreme hardness, radiation resisting, and high insulation, makes diamond an ideal material for optical application under extreme requirements. The relationship between the optical absorbance of diamond doped with nitrogen and the nitrogen concentration were studied. The calculation method of nitrogen concentration used in this study was a modification of the typical calculation method. The high nitrogen concentration diamond was synthesized in Fe_80Ni_20-carbon and sodium azide system. The absorbant intensity of diamond increases in 800—1400 cm-1 range. The nitrogen concentration in diamond increases with the increasing contents of NaN_3. The color of diamond changes with the increase of NaN_3 content, in the order of green, dark green and black. The diamond synthesized with addition of NaN_3 contains nitrogen exceeding 1450 ppm which is much higher than the normal diamond. The optical transmission of diamond decreases with the increase of nitrogen concentration. The diamond with nitrogen doping can be used as optical material with better absorbance and many physical characters at some wavenumber.