The crystal structures of V₂C and Ta₂C

Crystal Structures of Cubic and Trigonal Yttrium Hypocarbides; A Dimorphically Interphased Single-Crystal Study

“…On the other hand, m the ordered Ta2C with the anti-Cdl2 type structure, the Ta-C bond number is 3/4, which is smaller than or equal to the Ta-C. bond number in Ta2C with the disordered carbon atoms. Bowman et al (1965) (S)AS reviewed by Elliott (1965), there exists some discrepancies anaong the reported values The range cited above covers the variations m the reported data '^)Distance between the metal and the octahedral interstitial site Note that the octahedral sites are partially occupied by carbon atom«…”

The crystal structures of ThC2

“…Chemical analysis after the diffraction experiments showed Th 89.6%, C 10.18%, free C 1.0%, O 550 ppm, N 200 ppm. Observed intensities were determined by least-squares analysis of the diffraction data (Bowman, Wallace, Yarnell, Wenzel & Storms, 1965), and were fitted to trial structures by leastsquares solutions of the equation (Bacon, 1962) (Elliott & Hastings, 1961 ;Sequeira, 1965), space group Fm3m, with thorium atoms in (0,0,0) and C2 groups centered in (½,½,½). The data were fitted with free rotating C2 groups, with K=0.044+0.002, B=7.8+ 0.5, R = 0.04, dc-c = 1.24 + 0.04/~.…”

The crystal structure of Th3N4

“…The observed intensities were determined by leastsquares analysis of the diffraction data (Bowman, Wallace, Yarnell, Wenzel & Storms, 1965), and were fitted to the trial structure by least-squares solution of the equation (Bacon, 1962) exp (-pt sec0)…”