Handbook of Refractory Compounds

Samsonov, G. V.; Vinitskii, I. M.

doi:10.1007/978-1-4684-6099-5

Cited by 391 publications

(192 citation statements)

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“…The cell was calibrated using literature values of the conductivities of the electrolytes [35]: 0.02687 f~ -~ m -l (10-3M KOH), 0.2617 f~ -1 m -~ (10-2M KOH) and 36.19f~-lm -~ (2M KOH). The particle conductivities of B 4 C and graphite were given by the supplier; the other values are from literature [36]. In Table 2 these data are summarized.…”

Section: Methodsmentioning

confidence: 99%

The conductance of suspensions with conducting particles

et al. 1992

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The conductance of conductive ceramics, graphite and metal suspensions in aqueous KOH solutions was measured with the impedance technique using a four-electrode cell. The measurements were carried out for volume fractions up to high viscosities with particles of different sizes. A wide frequency range was used to investigate also the effect of particle-surface polarisation on the conductance. The results have been analysed in terms of the asymmetric and symmetric theories of Bruggeman and the GEM theory for a wide volume-fraction range of suspended particles. Depending on the suspended material, particle size and electrolyte properties, the suspensions reveal flocculation or chain formation. In case of chain formation, sometimes a decrease of the polarisation resistivity is found due to shortcircuiting by direct particle-particle contact. The conductivities of the particles phase, calculated from measured values, are orders lower than predicted from conductivity data of the pure materials. This is attributed to the occurrence of a constriction resistance and film resistance between the particles in the case of flocculation or chain formation as well as to poor wetting of the particles.

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Section: Methodsmentioning

confidence: 99%

The conductance of suspensions with conducting particles

et al. 1992

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“…For comparison, the experimental data from Refs. [30,31] and the theoretical molecular dynamics (MD) results by Adachi et al [32] are also presented.…”

Section: F Thermodynamic Propertiesmentioning

confidence: 99%

Electronic structures, mechanical and thermodynamic properties of ThN from first-principles calculations

Wang

et al. 2011

Journal of Nuclear Materials

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Lattice parameter, electronic structure, mechanical and thermodynamic properties of ThN are systematically studied using the projector-augmented-wave method and the generalized gradient approximation based on the density functional theory. The calculated electronic structure indicates the important contributions of Th 6d and 5f states to the Fermi-level electron occupation. Through Bader analysis it is found that the effective valencies in ThN can be represented as Th +1.82 N −1.82 .Elastic constant calculations shows that ThN is mechanically stable and elastically anisotropic.Furthermore, the melting curve of ThN is presented up to 120 GPa. Based on the phonon dispersion data, our calculated specific heat capacities including both lattice and conduction-electron contributions agree well with experimental results in a wide range of temperature.

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“…A variation in peak positions as observed for various rhombohedral boron carbides are explained to be the substitution of a carbon atom by a boron atom in the inter or intra icosahedrons [19,21,22,28].The phase detection has also been confirmed by a multiphase simulation programme and the results have been represented by Fig. 4.…”

Section: Evolution Of Crystallographic Structures and Phases In Micromentioning

confidence: 57%

“…The observed x-ray diffraction pattern has been shown in Figure- [25].Beside this fact, the data analysis of a multi phase pattern is always a complicated process. It happens specially in presence of factors like peak overlaps, continuous back grounds, variation in fixing of peak parameters, fixed algorithm, absorption, porosity, axial divergence of beam, radiation types, alignment problems, disorders, crystallinity , sample preparation, grain size and its uniformity [22,25]. Such a problem becomes critical when the structural variation are narrow as found in rboron carbides.…”

Section: Resultsmentioning

confidence: 99%

“…Mostly the C-atoms are 129 along the diagonal of the rhombohedron forming the inter-icosahedral chains in chain configuration. The widely studied three carbon atoms as in B 12 C 3 along the intericosahedral chain can be substituted all or in parts by vacancies or several types of atoms, thus forming the boron rich and carbon rich end of the stoichiometry [22]. The case of tetragonal structural unit for boron carbides is little different.…”

Section: Crystal Structure and Stoichiometrymentioning

confidence: 99%

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