Fig. 1. Schematic of the cell for diamond synthesis (1, conductive ring; 2, graphite sheet; 3, NaCl tube; 4, ceramic cylinder and cover; 5, graphite heater; 6, catalyst; 7, carbon source; 8, insulation tube; 9, seed crystal; 10, pyrophyllite).金刚石合成腔体示意图(1, 钢帽; 2, 石墨片; 3, 氯化钠管; 4, 陶瓷堵头; 5, 石墨加热管; 6, 触媒; 7, 碳源; 8, 绝缘管; 9, 晶种; 10, 叶蜡石)

Fig. 2. Optical images of diamond synthesized in FeNiMnCo-C system.FeNiMnCo-C体系中所合成的金刚石光学照片

Fig. 3. FTIR spectra of diamond co-doped with B and S: (a) With 1.2% B and 2.0% S additives; (b) with 0.8% B and 2.0% S additives.硼硫协同掺杂金刚石的红外光谱　(a)添加1.2%硼和添加2.0%硫; (b)添加0.8%硼和添加2.0%硫

Fig. 4. Band structures of the synthesized diamond: (a) Without B or S additive; (b) with 2.0% S additive; (c) with 1.2% B and 2.0% S additives; (d) with 0.8% B and 2.0% S additives.金刚石能带结构　(a)未添加硼与硫; (b)添加2.0%硫; (c)添加1.2%硼和2.0%硫; (d)添加0.8%硼和2.0%硫

Table 1. Parameters of the synthetic experiments of diamond performed at 6.5 GPa in the FeNiMnCo-C system.

Table 2. Electrical performance parameters of the diamond samples measured at room temperature ((a) without B or S additives, (b) with 2.0 wt.% S additive, (c) with 1.2% B additive, (d) with 1.2% B and 2.0% S additives, (e) with 0.8% B and 2.0% S additives).