Microstructures of metallic film and diamond growth from Fe-Ni-C system

Xu, Bin

doi:10.1360/02tb9278

Cited by 13 publications

(6 citation statements)

References 10 publications

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“…The pressure was estimated by the oil press load, which was calibrated by a curve that was established based on the pressure-induced phase transitions of Bi, Th and Ba. The temperature was determined from a relation between the temperature and input power, which had been calibrated using a Pt6%Rh-Pt30%Rh thermocouple [16,17] .…”

Section: Methodsmentioning

confidence: 99%

Dependence of nitrogen concentration in type Ib diamonds on synthesis temperature

et al. 2009

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Section: Methodsmentioning

confidence: 99%

Dependence of nitrogen concentration in type Ib diamonds on synthesis temperature

et al. 2009

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“…But graphite was not found in the inner layer of the film; and diamond structure was not observed in the whole film. Hence, the carbon sources forming the diamond structure do not come from the graphite structure directly [14,15] . TiC may exist in molten metallic film.…”

Section: Color Size Crystal Shape and Surface Morphology Of Diamondsmentioning

confidence: 99%

Effects of Ti additive on HPHT diamond synthesis in Fe-Ni-C system

Han

Jia

et al. 2009

Chin. Sci. Bull.

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Diamond crystals with low nitrogen concentration were synthesized from the Fe-Ni-C system with Ti additive at high pressure and high temperature (HPHT) in a china-type cubic high pressure apparatus (CHPA). The synthesis pressure range was 4.8-5.2 GPa, and the temperature range was 1420-1600 K. The lowest synthesis pressure for diamond fell first and then rose with the increase of Ti additive. The color, shape, surface morphology and nitrogen impurity concentration of the synthesized diamond crystals were characterized using optical microscopy (OM), scanning electron microscopy (SEM) and micro Fourier transform infrared (FTIR) spectrometry. The results show that the Ti additive has significant effects on color, growth rate, crystal shape, surface morphology and nitrogen impurity concentration of the synthesized diamond crystals. The color of diamond crystals synthesized without Ti additive is yellow, while that with Ti additive becomes light and nearly colorless. The growth rate without Ti additive is higher than that with Ti additive. The crystal shapes of as-grown diamond crystals vary with the increase of Ti additive. The {111} crystal faces become dominant and some {311} crystal faces appear with the increase of Ti additive. The concentration of nitrogen impurity in diamond crystals without Ti additive is higher than that with Ti additive.Ti additive, HPHT, diamond synthesis, low nitrogen concentration Since diamond was first synthesized from a metal catalyst/solvent and graphite mixture using the hydrostatic high-pressure and high-temperature (HPHT) method in 1954 [1] , numerous impurities were found in the diamonds synthesized by the HPHT method, part of which can enter diamond to form substitutes or inclusions [2][3][4][5][6][7][8] .

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“…There are various methods for diamond synthesis such as TGM (temperature gradient method) or solubility difference method under static high pressure, dynamic high pressure (shock wave) method, and chemical vapor deposition method [1][2][3][4][5][6]. Though the method of CVD is used to grow gem-diamond crystals [7][8][9][10], the technology of synthesis is not perfect.…”

mentioning

confidence: 99%

Synthesis of high quality type-Ib diamond crystals in carats grade

Xiao

Jia

et al. 2010

Chin. Sci. Bull.

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High quality type-Ib tower-shape gem-diamond crystals in carats grade were synthesized in cubic anvil high pressure apparatus (SPD-6×1200) at 5.4 GPa and 1250-1450°C. The relationship between the growth time and the weight of growth diamond has been gained. The faces of {110} and {113} were found in the synthetic diamond crystals frequently. We found that the relative growth rate of {113} face was descending with the increase of growth temperature, and that of {110} face had no obvious change with the increase of the growth temperatures and the growth time. In the work, the crystal defects were studied carefully, and the reasons for the appearance of the defects were also obtained. Some diamond crystals have been polished into the anvil of DAC (Diamond Anvil Cell) and the diamond jewelry. Compared with natural diamond crystal, synthetic diamond crystal has the merits such as small grinding quantity, low cost, etc., so it can be widely used in super high pressure field and gemstone industry. diamond, high pressure and high temperature, carat Citation:Xiao H Y, Jia X P, Ma H A, et al. Synthesis of high quality type-Ib diamond crystals in carats grade.

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Microstructures of metallic film and diamond growth from Fe-Ni-C system

Cited by 13 publications

References 10 publications

Dependence of nitrogen concentration in type Ib diamonds on synthesis temperature

Dependence of nitrogen concentration in type Ib diamonds on synthesis temperature

Effects of Ti additive on HPHT diamond synthesis in Fe-Ni-C system

Synthesis of high quality type-Ib diamond crystals in carats grade

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