کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1603759 | 1515990 | 2012 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Understanding of the shape-controlled synthesis of strip shape diamond under high pressure and high temperature conditions Understanding of the shape-controlled synthesis of strip shape diamond under high pressure and high temperature conditions](/preview/png/1603759.png)
We present the shape-controlled synthesis of strip shape diamond with stretched crystal faces along {100} or {111} direction and larger length-to-radius ratio than the conventional diamond in the designed NiFe–C system at high pressures and high temperatures (HPHT). A series of synthetic experimental results on the strip shape diamonds were obtained at different pressures and temperatures. Under the constant pressure condition, the morphology of the strip shape diamond varied with the increase of temperature obviously. Fourier transform infrared (FTIR) micro spectroscopy and Raman spectroscopy revealed that the various locations of crystal face have different nitrogen impurity concentration, and internal strain and defects in these strip shape crystals. According to these results, it can be concluded that the difference of growth rates at various crystal faces results in different crystal morphologies. Based on the growth characteristics, we suggest that composition segregation of the metal film around the growing crystal induces the formation of strip shape diamond.
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► We synthesize the strip shape diamond in the designed NiFe-C system.
► Strip shape diamond are stretched along {100} or {111} crystal faces.
► Strip shape diamond contains more nitrogen impurity, internal strain and defects.
► Composition segregation around diamond results in the strip shape morphology.
Journal: International Journal of Refractory Metals and Hard Materials - Volume 30, Issue 1, January 2012, Pages 85–90