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Tantalum carbides (TaC) form a family of binary chemical compounds of tantalum and carbon with the empirical formula TaC x, where x usually varies between 0.4 and 1. They are extremely hard , brittle, refractory ceramic materials with metallic electrical conductivity .
Because of the complexity of X-ray lenses, it is difficult to form an image of the crystal being diffracted, and hence phase information is lost. Fortunately, electron microscopes can resolve atomic structure in real space and the crystallographic structure factor phase information can be experimentally determined from an image's Fourier transform.
Carbon phase diagram, based on calculations from 1980s. Newer work indicates that the melting point doesn't go above about 9000 K. Source: J.M. Zazula (1997). "On Graphite Transformations at High Temperature and Pressure Induced by Absorption of the LHC Beam". CERN. Retrieved 2010-07. Author: Trackler (talk) 13:05, 18 July 2010 (UTC) Other ...
English: Theoretical phase diagram of carbon, which shows the state of matter for varying temperatures and pressures. The hatched regions indicate conditions under which one phase is metastable, so that two phases can coexist. The source reference says that the phase diagram is well established only up to around 100 GPa.
Tantalum is a chemical element; it has symbol Ta and atomic number 73. It is named after Tantalus, a figure in Greek mythology. [11] Tantalum is a very hard, ductile, lustrous, blue-gray transition metal that is highly corrosion-resistant.
[4] [5] [6] The CALPHAD approach is based on the fact that a phase diagram is a manifestation of the equilibrium thermodynamic properties of the system, which are the sum of the properties of the individual phases. [7] It is thus possible to calculate a phase diagram by first assessing the thermodynamic properties of all the phases in a system.
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The beta phase is metastable and converts to the alpha phase upon heating to 750–775 °C. Bulk tantalum is almost entirely alpha phase, and the beta phase usually exists as thin films [ 76 ] obtained by magnetron sputtering , chemical vapor deposition or electrochemical deposition from a eutectic molten salt solution.