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Tantalum monocarbide is typical of the group IV and V transition metal monocarbides. The smaller carbon atoms fit in the interstices of a fcc metal sublattice, providing a crystal structure of the NaCI type. Notably, the chemical bonding is mixed covalent and metallic, and large deficiencies in carbon content are tolerated without a change in structure. The maximum defect range in tantalum monocarbide is TaC0.73-TaC0.99.
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Bartlett et al. (1967) studied this question.
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