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Schematic of sample assembly for synthesis of diamond (a section through two opposite vertexes of octahedron): (1) Mo disk; (2), (3), (6) hBN pressure medium; (4) graphite heater; (5) pyrophyllite pressure medium; (7) graphite capsule; (8) Sn, Pb, Sb, Bi, Se, or Te; (9), (10) Mo foil.
SEM micrographs of crystallized diamond of Se–C system in the inner side of the graphite capsule: (a) from run S1 ; (b) from run S2 .
SEM micrographs of crystallized diamond of Te–C system in the inner side of the graphite capsule: (a) from run T1 ; (b) from run T2 .
Raman spectrum of diamond synthesized: (a) at 9.6 GPa and for 60 min for in run S2; (b) at 9.6 GPa and for 60 min for in run T2.
Experimental conditions and results. The symbol ○ indicates spontaneous nucleation and crystal growth of diamond crystals were found, X for the run that no diamond was found; and G indicates graphite.
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