Abstract
The laws of crystal growth in the Al-B-C system in the temperature range 2023-1073 K are analysed, and data are given on the properties of the crystals. The crystals are divided into three groups on the basis of their appearance: 1. (1) AlB 2 with hexagonal symmetry, 2. (2) amber crystals with tetragonal symmetry and 3. (3) black crystals with tetragonal and orthorhombic symmetry. The Knoop hardness of the (111) face of the amber crystals is 26.5 GPa, that of the (100) face of the black crystals is 22.9 GPa under a load of 2 N. The (100) faces of the amber crystals and those of the black ones exhibit a fracture toughness of 5.3 MPa m 1 2 and 2.2 MPa m 1 2 , respectively. The amber and the black crystals are p-type semiconductors. The activation energy of electrical conductivity in the temperature range 200–400 K is 1 eV for the amber crystals and 0.1 eV for the black ones. The failure load as a function of crystal size is defined under static load; thermal conductivity of the amber and the black crystals at 310 K is estimated to be 19.6 W m −1K −1 and 38.7 W m −1 K −1, respectively.
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