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3 edition of Heats and Free Energies of Formation of Vanadium Nitride and Vanadium Carbide. found in the catalog.

Heats and Free Energies of Formation of Vanadium Nitride and Vanadium Carbide.

United States. Bureau of Mines.

Heats and Free Energies of Formation of Vanadium Nitride and Vanadium Carbide.

by United States. Bureau of Mines.

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Published by s.n in S.l .
Written in English


Edition Notes

1

SeriesReport of investigations (United States. Bureau of Mines) -- 6177
ContributionsMah, A.
ID Numbers
Open LibraryOL21742505M

Vanadium (EINECS No. ) Vanadium carbide (EINECS No. ) Vanadium carbide nitride (EINECS No. ) Vanadium dioxide (EINECS No. ) Vanadium oxalate complexes (EINECS No. ) Vanadium oxide sulphate (EINECS No. ) View the substance portfolio of the Vanadium consortium. E-mail the SIEF Facilitator. Titanium Technology in Microalloyed Steels Proceedings of a Conference Held at the University of Strathclyde, December Proceedings of a Conference .

Heats and free energies of formation of oxides of vanadium (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors: Alla D Mah; K K Kelley; United States. Bureau of Mines. MXenes are the class of two-dimensional transition metal carbides and nitrides that exhibit unique properties and are used in a multitude of applications such as biosensors, water purification, electromagnetic interference shielding, electrocatalysis, supercapacitors, and so forth. Carbide-based MXenes are being widely explored, whereas investigations on nitride-based ones are seldom. Among.

@article{osti_, title = {Solubility products for titanium-, vanadium-, and niobium-carbide in ferrite}, author = {Taylor, K A}, abstractNote = {Carbide- and nitride-forming elements, such as titanium, vanadium, and niobium, play important roles in the metallurgy of many modern steel products. These elements readily precipitate as stable carbides/nitrides during processing, even when. Vanadium is a chemical element with the symbol V and atomic number It is a hard, silvery-grey, malleable transition elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer (passivation) somewhat stabilizes the free metal against further oxidation.. Andrés Manuel del Río discovered compounds of vanadium in in Mexico by.


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Heats and Free Energies of Formation of Vanadium Nitride and Vanadium Carbide by United States. Bureau of Mines. Download PDF EPUB FB2

Additional Physical Format: Online version: Mah, Alla D. Heats and free energies of formation of vanadium nitride and vanadium carbide (OCoLC) Heats and free energies of formation of vanadium nitride and vanadium carbide / By Alla D.

Mah. Abstract. Mode of access: Internet Topics: Vanadium carbide., Vanadium nitride. Publisher: Washington, D.C Author: Alla D.

Mah. The relative partial molar Gibbs energies of vanadium in the vanadium-carbon system have been determined for the V-C alloys containing,and at. pct. The consequence is that in the presence of oxygen nitrides are not formed.

The vanadium–nitrogen phase diagram shows that two stable phases exist: the hexagonal β-V 2 N and the cubic δ-VN phase. According to the free energy of formation of VN the nitride could be obtained by heating vanadium metal in a nitrogen atmosphere at ° by: Vanadium nitride was prepared by heating a mixture of vanadium pentoxide and graphite powder under a flowing nitrogen atmosphere.

The resultant nitride was evaluated by powder X-ray diffraction. Neglecting the strain energy term, the Gibbs energy for the formation of a spherical embryo of vanadium carbonitride from the elements in solid solution is classically expressed as the sum of a volume and an interface term (5) In this equation, Δg is the driving energy for nucleation per unit volume and R is the radius of the embryo.

All metals with limited free energy for carbide (nitride) formation and forming oxides less stable than B 2 O 3 can be used as CFE. Among them, chromium and vanadium represent a good choice because of their high affinity with carbon and nitrogen and because of their carbide and nitride excellent properties in terms of wear, oxidation and.

For vanadium, the equation is (14) d R d t = D V R X V ss-X V i V Fe V VCN-X V i. During an isothermal precipitation treatment, the composition of vanadium in solid solution X V ss decreases, and consequently the growth rate decreases.

In the meantime, the composition of vanadium at the interface X V i evolves. Note that Eq. Vanadium carbide is not there, but I found a value of kcal/mol (note the different units) in an article from Journal of Physical Chemistry.

Here is the citation: "The Free Energies of Formation of the Vanadium, Niobium, and Tantalum Carbides" Wayne L. Worrell, John Chipman Journal of Physical Chemistry, vol issue 4 pp – the metal saturated with respect to the carbide and likewise unit activity for the carbide is the carbide saturated with its respective metal.) equilibrium with the other condensed phase of the reaction.

Many transition metals form several carbides, and an effort is made to report their existence and stabilities. High Temperature Heat Contents of Vanadium Carbide and Vanadium Nitride. The enthalpies and free energies of formation, heat capacities, and dissociation pressures for the subnitride and.

metals with limited free energy for carbide (nitride) formation and forming oxides less stable than B 2 O 3 can be used as CFE [7]. Among them, chromium and vanadium represent a good. NIST reserves the right to charge for access to this database in the future.

The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment.

The solubility products of vanadium carbide and nitride in ferritic iron of Fe-V-C and Fe-V-N systems were studied in the temperature range from to °C. The specimens, after solution treating and subsequent quenching into ice water, were heat-treated in the ferrite range to precipitate the vanadium carbide or nitride sufficiently.

activity study of vanadium nitride, vanadium carbonitride, and vana-dium carbide reveals that tuning anions offers a promising route for the activity enhancement of the non-precious metal catalysts. According to a U.S. Department of Energy (DOE) study, the cost of platinum (Pt)-based catalyst layers in a proton exchange.

Because the solubilities of vanadium carbide and vanadium nitride are very different, the relative amounts of carbon and nitrogen in vanadium steels are important. So is the presence of other elements which may compete for nitrogen, such as aluminum. Mah, Alla D.: Heats and free energies of formation of vanadium nitride and vanadium carbide / (Washington, D.C.: U.S.

Dept. of the Interior, Bureau of Mines, ) (page images at HathiTrust) Mah, Alla D.: Heats of combustion and formation of carbides of tungsten and molybdenum / ([Washington, D.C.]: U.S. Bureau of Mines, []), also by.

The grain refinement effects are generally associated with two aspects: (i) the precipitation pining effect generated by the fine vanadium carbide VC and/or vanadium nitride VN particles; and (ii) the solute dragging effect caused by suppressing the grain boundary migration through the solute dissolved in the austenite [9,10,11].

The existence. Vanadium (V) has a strong affinity for other elements such as carbon and nitrogen and is, thus, present in the form of Vanadium Carbide (VC) or Vanadium Nitride (VN) precipitates [5]. VN can. Vanadium nitride and hafnium nitride films were grown onto Si () and AISI steel substrates using a multi-target magnetron sputtering system.

The AISI steel discs with a diameter of mm used as substrates were cut with a total thickness of 5 mm and were mechanically polished by using 1 µm grit Al 2 O 3. An efficient method of synthesis of the vanadium nitride (VN) at low temperature is evaluated, and a mechanism for the crystallization process is proposed in this paper.

From the mixture of ammonium m-vanadate with guanidinium carbonate an intermediate, guanidinium m-vanadate (GmV), is produced. GmV decomposed and underwent interesting structural transformations with increasing temperatures.

The analysis of V 2p 3/2 level with the corresponding bands centered at –, –, and – eV, clearly indicates the coexistence on the surface of vanadium carbide and different types of V n+-O species, the latter corresponding to the two higher binding energy .Enthalpy and free energy of formation of vanadium subnitride (VN₀₄̣₆₅), ° to 1,° K.