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Lattice expansions of two boron carbides between 12 and 940°C
Author(s) -
Yakel H. L.
Publication year - 1973
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889873009246
Subject(s) - thermal expansion , boron , boron carbide , isotropy , carbide , lattice (music) , lattice constant , chemical composition , materials science , diffraction , carbon fibers , analytical chemistry (journal) , chemistry , thermodynamics , metallurgy , physics , composite material , organic chemistry , quantum mechanics , composite number , acoustics , optics
High‐temperature X‐ray diffraction methods have been used to determine unit‐cell parameters of two boron carbide compositions from 12° to about 940°C. One composition was at the carbon‐rich end of the phase field ( i.e. B 4 C), the second at the boron‐rich end (5 at. % C by chemical analysis). The lattice expansion of both substances was isotropic in the temperature range studied. The mean linear thermal expansion coefficient for the carbon‐rich composition is 5.65 x 10 −6 °C −1 , while that of the boron‐rich composition is 5"87 x 10 −6 °C −1 .