Under big temperature and force conditions, add a certain rate ofboron powderin iron-nickel powder catalyst to synthesize sort boron-doped diamond single crystal.
The synthesis of quality boron-doped diamond
Throughoptical microscopy found that, the synthesis boron-doped diamond were sinisteru blackoctahedral, intact crystal form, uniform size; using scanning electronmicroscopy (SEM) analysis of the morphology of boron-doped diamond The resultsshow that: the synthesis of octahedral boron-doped diamond crystals surface issmooth, flat, crystal has high refinement of integrity, the worthy crystallineregion of boron-doped diamond is in the V-shaped field of the 100 + 111range
The synthetic diamonds growing environmentcontains many immorality ingredients, some of these impurities can register intodiamond as the substitutional covert or the haunt of inclusions Differrentimpurities results on the action of diamond is different. Boron is a commonimpurity angle in the diamond, in standard diamond you often can find its traces
When the diamond contains a certain amountof boron, leave improve the diamonds mind optical, thermal, chemical,electrical and technical In optics make the crystal with color, with theincrease of the boron topic in diamond, crystals from yellow graduallybecomes brownish red, gray, blue, until it becomes threatening black; in thermology, diamondhas admireable inoxidizability, heat resistance and thermal conductivity; in electricalaspects, make the diamond from insulation entity turn into the P-type semiconductor, even havethe semimetals conductive; in chemistry, the boron-doped diamond can indentation ironfamily material; in the specialized properties, the diamonds abrasionresistance, toughness, compressive tightness are enhanced In different areashas shown a broad vision, which aroused the interest of many researchers.However, with the enlarge of the symbol of boron doped, relatively easy tosynthesize octahedral diamond with boron, the synthesized crystals surfacedefects were increased
The iron-based assortment powder (200 mesh) ascatalyst solvent, scaly graphite powder (200 mesh) as the carbon source, usehigh-purity boron powder as additive The synthesis conditions is 5.0GPa, 1450K-1700K,conduct an experiment Iron-based catalyst, flake graphite and the amend amountof boron powder according to a certain proportion uniformly varying and pressedinto synthetic rods, assembling the pressed barstock in pyrophyllite synthesisblock. The pyrophyllite Synthesis halt before assembling was through