Abstract
For the work results correct interpretation, it is important to study initial materials that scientists have to deal with. Currently, there are a large number of different diamond substrates. Comparison of materials among themselves allows you to determine which material you are dealing with. In this work, the methods of infrared (IR) spectrometry, Raman spectroscopy and spectrophotometry are used to study four types of diamond materials: diamond polycrystalline CVD-films; natural single-crystal diamonds; synthetic polycrystalline HPHT-diamonds (such as DSPC – diamond synthetic polycrystal by GOST 9206-80); polycrystalline CVD-diamonds CDM manufactured by E6. In work it was shown that the Raman spectroscopy allows to measure the effect of heat treatment on changes in the diamond structure, even if it is such highly advanced diamond materials as natural diamonds. Heat treatment affects the perfection of diamond crystal structure by reducing stresses and the number of defects in it due to graphitization process. The IR spectrometry method is effective for determining the shape and amount of nitrogen inclusions in diamond structure. To study polycrystalline CVD-films, the spectrophotometry method turned out to be the most effective, because it made possible to determine a small number of nitrogen defects and draw conclusions about the quality of the films. The investigation of polycrystalline diamonds CDM and DSPC demonstrated that, despite their coarse-crystalline structure, diamond crystallites consist of a highly defective diamond phase; in addition, DSPC-diamonds were studied using this method in the first time.
Highlights
IntroductionSynthesis of macroscopic size of diamond from the gas phase (CVD-process) occurs at relatively low deposition rates that for polycrystalline diamond are typically ~ 1 – 10 μm
As a result of the study of diamond samples, we revealed changes in the crystal lattice depending on the heat treatment and calculated the concentration of nitrogen defects
Raman spectroscopy allows to measure the effect of heat treatment on changes in the diamond structure, even if it is such highly advanced diamond materials as natural diamonds
Summary
Synthesis of macroscopic size of diamond from the gas phase (CVD-process) occurs at relatively low deposition rates that for polycrystalline diamond are typically ~ 1 – 10 μm. This method was first developed by Soviet researchers [1 – 2]. Both single-crystal and polycrystalline CVD diamond wafers and films are widely used today [3 – 4]. The result is a significantly lower surface roughness of nanocristalline films than microcrystalline diamond of the same thickness, which, in turn, may be preferred for optics and tribology applications
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