報(bào)告june 4no 21-bingmin yan

1、Synthesis of synergistically doped diamond crystals under HPHTBingmin YanMSC Lab ChangchunSupervisor：Prof. Jiuhua ChenI.IntroductionII.Synthesis of N/H and B/S synergistically doped diamond crystal under HPHT.III. Synthesis of (NPD).onion carbon and nano-polycrystalline diamondIV. Work PlanIndustryJ

2、ewelryNationaldefenseScience andtechnologyCharacteristic and application of diamondAnticorrosionMohshardnessThermalconductivityCompressionratioSynthesis of diamond crystals under HPHTHPHT synthesisHPHTCatalytic HPHT synthesisFGMTGMThe film growth method (FGM) Graphite Diamond The solubility of the g

3、raphite carbon is higher than that of diamond carbon in the metallic filmTemperature gradient method Diamond Diamond The driving force of diamond growth is provided by the solubility difference resulting from the temperature gradient in the growth cell.The axial temperature gradient (Th) and the rad

4、ial temperature gradient (Tr)N/H co-doped diamondA center1282 cm-1C center 1130 cm-1B center 1175 cm-1Optical images of the N/H co-doped diamond crystalsTypical FTIR spectra recorded for diamond crystals (a-c) N/H co-doped diamond, (d) natural diamondSampleConcentration of nitrogen/ppmNCNANtotala142

5、501425b529202731c371317688N/H co-doped diamondIaA typeA center1282 cm-1C center 1130 cm-1B center 1175 cm-1Optical images of the N/H co-doped diamond crystalsTypical FTIR spectra recorded for diamond crystals (a-c) N/H co-doped diamond, (d) natural diamondSampleConcentration of nitrogen/ppmNCNANtota

6、la142501425b529202731c371317688N/H co-doped diamondIaA typeOptical images of the N/H co-doped diamond crystalsTypical FTIR spectra recorded for diamond crystals (a-c) N/H co-doped diamond, (d) natural diamondSampleConcentration of nitrogen/ppmNCNANtotala142501425b529202731c371317688N/H co-doped diam

7、ondThepeaksat2850and2920cm-1attributed to sp3 hybridization C-H bond symmetric and anti-symmetric vibrations, and the peak at 3107cm-1 attributed to stretching vibration of the vinylidene group (C=H2).IaA typeOptical images of the N/H co-doped diamond crystalsTypical FTIR spectra recorded for diamon

8、d crystals (a-c) N/H co-doped diamond, (d) natural diamondSampleConcentration of nitrogen/ppmNCNANtotala142501425b529202731c371317688N/H co-doped diamondThepeaksat2850and2920cm-1attributed to sp3 hybridization C-H bond symmetric and anti-symmetric vibrations, and the peak at 3107cm-1 attributed to s

9、tretching vibration of the vinylidene group (C=H2).IaA typeOptical images of the N/H co-doped diamond crystalsTypical FTIR spectra recorded for diamond crystals (a-c) N/H co-doped diamond, (d) natural diamondSampleConcentration of nitrogen/ppmNCNANtotala142501425b529202731c371317688B/S co-doped diam

10、ondSampleP (GPa)NB(wt.%)NS(wt.%)T()a6.00.501290b6.00.501317c6.00.801346d6.00.80.51346e6.00.80.51338f6.00.80.51320B/S co-doped diamondSampleP (GPa)NB(wt.%)NS(wt.%)T()a6.00.501290b6.00.501317c6.00.801346d6.00.80.51346e6.00.80.51338f6.00.80.51320Synthesis of onion carbon and nano-polycrystalline diamon

11、d (NPD) Nano-polycrystalline diamond (NPD) : High optical transparency. High hardness No anisotropy of hardness Knoop hardness: 110-140 GpaIrifune et al 2003 Nature. 421 599 Nanotwinned diamond (nt-diamond) Unprecedented hardness and thermal stability Vickers hardness: 200 GPaQuan Huang et al 2014 N

12、ature. 13381The synthesis of onion likecarbon The onion like carbon (OLC) synthesized by heating naphthalene to itsflashpoint (78.89) in air. The carbon material is collected by beaker. The remaining naphthalene and amorphous carbon were removed byheating the sample in air at 500 for 30 min.M. Chouc

13、air CARBON 50 (2012) 11091115The SEM image ofOLCThe TEM image ofOLCRegions of opacity in the TEM image represent overlapping particlesThe HRTEM image ofOLCThe cores within the onion carbon are not hollow, and they show a continuation of the closed cage structure towards the centerThe onion carbon sy

14、nthesized by CVD methodG1594D13601578ID/G=0.851348ID/G=0.47Raman spectra of onion carbona: synthesized by heating naphthalene. b: synthesized by CVDVogg Walker-type 1000 tons multi-anvil apparatusState Key Lab of Superhard Materials, Jilin universityThe optical image of NPDS2S1S3RunP (GPa)T()Time (s)S116200420805S2161850-190015S3161900193060The Raman spectra of NPD The SEM image o