Diffraction of light by opals
Diffraction of light by opals
复制标题
蛋白石对光的衍射
DOI：
10.1107/s0567739468000860
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发表时间：
1968
期刊：
影响因子：
--
通讯作者：
J. V. Sanders
中科院分区：
文献类型：
--
作者：
J. V. Sanders
宝石蛋白石进行了检查，在一个光学衍射仪，并发现给出几种类型的衍射图案，这是解释与传统的三维X射线理论类比，给蛋白石的结构。结果表明，蛋白石中的球形二氧化硅颗粒呈六边形层状排列，通常是随机堆积的。在一些标本中，有平行的有序堆积区域，通常在f.c.c.序列，有时是H.C.P.序列。虽然二氧化硅颗粒不能通过光学显微镜分辨，但在具有衍射光的图像中可以看到平行于层的带和跨带的条纹。
Gem opals were examined in an optical diffractometer and found to give several types of diffraction pattern which are interpreted by analogy with conventional three-dimensional X-ray theory to give the structure of the opal. The results show that the spherical silica particles in opals are arranged hexagonally in layers which are usually stacked randomly. In some specimens there are parallel domains of ordered packing, commonly in a f.c.c. sequence and sometimes in a h.c.p. sequence. Although the silica particles cannot be resolved by optical microscopy, bands parallel to the layers and fringes across the bands can be seen in images with the diffracted light.