Superhard materials (review). Part I. Crystal structure, synthesis, properties. Application of materials obtained at high temperature and pressure
Year: 2024
Type: article
Abstract: An overview of superhard crystalline materials (microhardness or Vickers hardness of which is more than 40 GPa) obtained at high temperature and pressure is presented. Superhard materials, first of all, include the hardest ― diamond, characterized by a hardness of 70‒110 GPa (natural diamond). The hardness of polycrystalline and nanocrystalline diamonds is 10 and 25 % higher. Cubic boron nitride (as well as diamond) is obtained in high-pressure installations, its hardness reaches 62 GPa. Based on phase of fullerene C60 (hardness 140‒170 GPa), phase boron: α-B12, β-B106 и γ-B28 (42‒50 GPa), rombo eticheskie subnitride вora В13N2 (40 GPa), the boron carbonitrides: β-BC2N, c-BC2N и z-BC2N (70,8‒76 GPa), a cubic boron carbide with ВС5 (49 GPa), carbon nitrides: α-С3N4, β-С3N4, c-С3N4, p-С3N4 и cs-С3N4 (62,3‒92,0 GPa) they are metastable and it is not yet possible to obtain bulk materials based on them. Ill. 3. Ref. 122. Tab. 5.
Authors: S. N. Perevislov, V. A. Zolochevskaya
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4405367215