Orthogonal structure BC3N crystal and preparation method thereof

Abstract

The present invention relates to a functional material and the preparation method thereof, in particular to a BC 3 N crystal body with an orthorhombic structure and the preparation method thereof. The present invention is characterized in that the chemical components of the orthorhombic structure BC 3 N crystal body is B 18 to 20at percent, C 57 to 63at percent and N 18 to 20at percent. The present invention has the preparation method that: a. a powder B-C-N predecessor is prepared; b. the powder B-C-N predecessor is pressed as a disk-like sample (6), to load into a small plumbago crucible (5), and the upper end and the lower end free distances are filled up by a hexagonal boron nitride slice (7); then the small plumbago crucible is orderly put in a pyrophyllite sleeve (3) and a big plumbago crucible (2); at last, the assembled big plumbago crucible (2) is put in a pyrophyllite square block; c. the assembled block is processed under a high temperature of 1400 to 1600 DEG C and a high pressure of 5 to 6 GPa, and the assembled block is cooled to the room temperature after insulating 10 to 60 minutes; d. the gained product is processed chemically, the plumbago and the hexagonal boron nitride are removed, and then a black BC 3 N crystal particle is gained.

Description

technical field [0001] The invention relates to a functional material and a preparation method thereof, in particular to an orthogonal structure BC 3 N crystals and methods for their preparation. Background technique [0002] Since Cohen et al. predicted that the light element boron carbon nitrogen ternary compound may be a new generation of superhard materials after diamond and cubic boron nitride and may have semi-metal or semiconductor properties, theoretical calculations and experiments on light element B-C-N compounds The research on synthesis has always attracted extensive attention of material scientists. Theoretical predictions suggest that most of the crystal structures of B-C-N compounds are limited to hexagonal and cubic structures. Most of the synthesized products in experiments have structures of turbostratic graphite. It is difficult to synthesize B-C-N ternary compounds or crystals with better crystallinity. In recent years, people have used the synthesis te...

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Problems solved by technology

In addition, most of the current research focuses on the BC with higher carbon content X On compounds of type N(x=2 or 4), especially for BC 2 Both theoretical and experimental studies of N compounds are relatively extensive, however, for BC 3 N crystals and their preparation methods have not been reported in the literature

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