X-Ray Bragg Reflexion, 'Spike' Reflexion and Ultra-Violet Absorption Topography of Diamonds

摘要: The relation between X-ray diffracting properties and ultra-violet absorption has been studied point by on polished plates of diamond having thicknesses from 0-1 mm to more than 1 edge lengths 2 cm. Most specimens exhibit marked non-uniformity absorption. intensity the ‘spike’ reflexions was found be roughly proportional absorption, point, a t least in range weak moderate spike intensities. Hence it is concluded that platelets responsible for ‘spikes’ are also characteristic type I absorptions. However, high values have only observed relatively perfect crystal regions with low density grown-in dislocations as determined topography; suggested imperfect containing many impurity precipitation form coherent matrix may inhibited or pre-empted some other way. Thus absence ‘ spikes ’ absorptions not necessarily imply impurity. On hand, transparency can highly perfect; hence lattice imperfection associated II optical characteristics. A comparison equivalent cube directions, made specimen selected definition its topograph features, showed where platelet present had occurred equally all planes. sharpness boundaries association such growth stratifications revealed Bragg reflexion topographs suggest they correspond variations concentration crystal, no detectable subsequent diffusion taken place.