Mass Spectrometric Study of the Systems Boron—Carbon and Boron—Carbon—Silicon

Abstract

The vaporization behavior of the systems boron—carbon and boron—carbon—silicon has been studied with a mass spectrometer. In addition to the gaseous species characteristic of graphite, silicon carbide and boron, the molecules BC₂, B₂C, BCSi, BSi₂, BC, and BSi were identified and their atomization energies measured. The values are: 294, 254, 247, 174, 106, and 68 kcal/mole, respectively. The atomization energies of SiC, Si₂C, and SiC₂ have been redetermined.