Lattice Constants of Boron Carbides

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<jats:p>The lattice constants of boron carbides have been determined by powder X‐ray diffraction for samples with compositions between about 7.7 and 20.5 at.% carbon. The boundaries of the single‐phase region are at about 9 at.% carbon and near, but likely somewhat less than, 20 at.% carbon. The composition dependence of the lattice constants thus established provides a method of assessing the carbon concentration of unknown materials. In particular, assignment of the approximate composition of single crystals used in previous studies allows for a systematic examination of changes in interatomic separation as a function of composition. These changes are discussed in terms of a structural model of the boron carbide solid solution.</jats:p>

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