Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chemical compound
Tantalum hafnium carbide is a refractory chemical compound with a general formula TaxHfyCx+y, which can be considered as a solid solution of tantalum carbide and hafnium carbide. It was originally thought to have the highest melting of any known substance but new research has proven that hafnium carbonitride has a higher melting point.
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higher melting point of 3,958 °C exceeding those of tantalumcarbide and tantalumhafniumcarbide which were both previously estimated to be higher. However...
TaC actually has a melting point of 3,768 °C and both tantalumhafniumcarbide and hafniumcarbide have higher melting points. TaCx powders of desired composition...
that hafnium or its carbides might be useful as construction materials that are subjected to very high temperatures. The mixed carbidetantalumhafnium carbide...
structures of the metals and their carbides. (N.B. the body centered cubic structure adopted by vanadium, niobium, tantalum, chromium, molybdenum and tungsten...
compound known, with a melting point of 3890 °C. The ternary compound tantalumhafniumcarbide has one of the highest melting points of all known compounds (4215 °C)...
of refractory metal implants, titanium, hafnium, niobium, tantalum and rhenium. Biocompatibility of tantalum". Biomaterials. 22 (11): 1253–1262. doi:10...
that hafnium or its carbides might be useful as construction materials that are subjected to very high temperatures. The mixed carbidetantalumhafnium carbide...
zirconium carbide and tantalumcarbide is an important cermet material.[citation needed] Hafnium-free zirconium carbide and niobium carbide can be used...
theoretical possible up to the highest crystal material, such as tantalumhafniumcarbide 4215 °C.) Allotropy – Property of some chemical elements to exist...
monochloride: HfO2 + 2 Cl2 + C → HfCl4 + CO2 Chlorination of hafniumcarbide above 250 °C. Hafnium and zirconium occur together in minerals such as zircon...
element similar to tantalum in 1801 and named it columbium. In 1809, English chemist William Hyde Wollaston wrongly concluded that tantalum and columbium were...
periodic table. It contains the four elements titanium (Ti), zirconium (Zr), hafnium (Hf), and rutherfordium (Rf). The group is also called the titanium group...
a lustrous, grey-white, strong transition metal that closely resembles hafnium and, to a lesser extent, titanium. Zirconium forms a variety of inorganic...
the fifth period (niobium and molybdenum) and three of the sixth period (tantalum, tungsten, and rhenium). They all share some properties, including a melting...
180W. Theoretically, all five can decay into isotopes of element 72 (hafnium) by alpha emission, but only 180W has been observed to do so, with a half-life...
magnesium, and zinc. The carbide-forming metal can be selected from titanium, zirconium, hafnium, vanadium, niobium, tantalum, and chromium, where Ti,...
[citation needed] For refractory materials (e.g. platinum, tungsten, tantalum, some carbides and nitrides, etc.) the extremely high melting point (typically...
such as tungsten (melting point 3695 K, boiling point 6203 K) or tantalumhafniumcarbide (melting point 4263 K, boiling point some unknown higher temperature)...
contain lanthanides in association with the elements such as tantalum, niobium, hafnium, zirconium, vanadium, and titanium, from group 4 and group 5,...
acid, the mineral sodium borate, and the ultra-hard crystals of boron carbide and boron nitride. Boron is synthesized entirely by cosmic ray spallation...
elements are also incorporated in so-called graphite intercalation compounds. Carbides are binary compounds of carbon with an element that is less electronegative...
than other direct heating designs by using a retained seed (tantalumcarbide or hafniumcarbide) approach. The propellant flows through the porous walls...
A.E.; de Boer, J.H. (1925). "Preparation of pure titanium, zirconium, hafnium, and thorium metal". Zeitschrift für anorganische und allgemeine Chemie...
octahedra. It is isomorphous to transition metal tetrachlorides of zirconium, hafnium, and platinum. Two polymorphs of technetium trichloride exist, α- and β-TcCl3...
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