Physiso-Chemical and Thermophysical Properties of Cubic Binary Carbides

Krajewski, A.; D’Alessio, L.; Maria, G. De

doi:10.1002/(sici)1521-4079(1998)33:3<341::aid-crat341>3.0.co;2-i

Cited by 102 publications

(49 citation statements)

References 11 publications

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“…It is known that the vacancies can distort the crystal structure and change the chemical bonding in the vicinity of these defects. Generally speaking, a higher vacancy concentration (or a lower carbon content) increases the number of the M-M bonds and diminishes the covalent character of the bonding [45][46][47][48]. However, there are some results published in the literature that contradict this statement [49,50].…”

Section: Chemical Bondingsupporting

confidence: 80%

Physical Properties of the NbC Carbide

Cuppari

Santos

2016

Metals

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Transition metal carbides are interesting materials with a singular combination of properties, such as high melting points, high hardness, good transport properties and relatively low costs, which makes them excellent candidates for several technological applications. The possible applications of NbC carbide remained unexplored as it was in the past expensive and available in limited volumes. In order to guide investigations of the applicability of NbC, a deeper understanding of the physical properties of this carbide is fundamental. In this review paper, key physical properties of NbC are compiled with emphasis on its chemical bonding, a careful description of the C-Nb phase diagram, the phases formed and the crystal structures. Thermal properties are discussed and correlated with the intrinsic and extrinsic features of NbC. Finally, elastic properties are discussed.

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Section: Chemical Bondingsupporting

confidence: 80%

Physical Properties of the NbC Carbide

Cuppari

Santos

2016

Metals

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“…Fitting the Murnaghan equation of state [34] to the total energies versus lattice volume yields the equilibrium lattice constant (a eq = 4.42Å), the bulk modulus (B 0 = 369.83 GPa) and the pressure derivative of the bulk modulus (B = 4.58). When the equilibrium lattice constant is compared to the experimental value (a = 4.456Å) [4,35], we find that our calculated result is rather close to the experimental value.…”

Section: Resultsmentioning

confidence: 99%

“…Tantalum carbides are refractory materials widely employed as coatings in the field of high temperature technology because of their peculiar physical and chemical properties ranging from high thermal stability to good resistance against corrosion [1][2][3][4][5]. TaC is usually a non-stoichiometric material TaC x with 0 x 1, it presents a rock-salt structure and has a melting point of about 3880…”

Section: Introductionmentioning

confidence: 99%

“…• C, a Knoop hardness of 2000 kg/mm 2 [4] and a superconducting transition temperature of ∼10 K. The material has attracted much interest, but good understanding has been elusive because, as in other transition metal carbides and nitrides [5][6][7][8][9][10][11][12], TaC exists over a wide range of compositions outside stoichiometry and its physical properties vary as a consequence. Mechanical, thermal, electrical and optical properties have been investigated from both theoretical and experimental points of view [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Electronic structure and optical properties of TaC from the first principles calculation

et al. 2005

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Abstract. The electronic and optical properties of tantalum carbide TaC have been calculated using the full-potential linearized augmented-plane-wave method within the local density approximation scheme for the exchange-correlation potential. We find that the optical spectra can be extremely sensitive to the Brillouin zone sampling. The influence of relativistic effects on the dielectric function is investigated. It is shown that the scalar-relativistic correction is much more important than spin-orbit coupling. Our results are found to be in good agreement with the available experimental data. The determinant role of a band structure computation with respect to the analysis of optical properties is discussed. PACS

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“…The extremly high hardness of the current films might be due to the composition variation and the small grain size of the reinforcing TiC nanocrystallites. In comparison, the hardness and the Young's modulus of bulk TiC ceramic material are 30 GPa [21] and 439.43 GPa [22], respectively. It is noted that the nanohardness values can not be compared directly with the hardness determined at larger forces the hardness increases proportionately with decreasing test force (referred to as indentation size effect (ISE) [23]).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Examination of nanocrystalline TiC/amorphous C deposited thin films

Oláh

Vereš

Sulyok

et al. 2014

Journal of the European Ceramic Society

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Abstract:The relationship between structural, chemical and mechanical properties of nanocrystalline TiC / amorphous C thin films was studied. Thin films were deposited by DC magnetron sputtering on oxidized silicon substrates in argon at 25 C° and 0.25 Pa. The input power of the carbon target was 150 W, the input power of the titanium target was varied between 15 and 50 W. It was found that all thin films consist of a few nanosized columnar TiC crystallites embedded in carbon matrix. The average size of TiC crystallites and the thickness of the carbon matrix have been found to correlate with Ti content. The mechanical properties of the films have been strictly dependent on their structure. The highest values of the nanohardness (~ 66 GPa) and Young's modulus (~ 401 GPa) were observed for the film with the highest TiC content which was prepared at 50 W of Ti target. The relationship between structural, chemical and mechanical properties of nanocrystalline TiC / amorphous C (TiC/a:C) thin films was studied. Thin films were deposited by DC magnetron sputtering on oxidized silicon (Si/SiO 2 ) substrates in argon at 25 C° and 0.25 Pa. The input power of the carbon target was kept at constant value of 150 W while the input power of the titanium target was varied between 15 and 50 W.It was found that all thin films consist of a few nanosized columnar TiC crystallites embedded in carbon matrix. The average size of TiC crystallites and the thickness of the carbon matrix have been found to correlate with Ti content in the films. The mechanical properties of the films have been strictly dependent on their structure. The highest values of the nanohardness (~ 66 GPa) and Young's modulus (~ 401 GPa) were observed for the film with the highest TiC content which was prepared at the largest input power of Ti target.The recommended keywords are: TiC/a:C, magnetron sputtering, structure, mechanical properties, XPS Looking forward your positive answer. Sincerely yours, Nikolett OlahCover Letter SummaryThe nanocomposite structures will be applied as protective materials or hard coating for multifunctional, industrial and engineering applications [6][7][8]. In previous studies only a few preparation methods for TiC films have been investigated in details. One of them, the vacuum deposition provides great flexibility for manipulating material chemistry and structure, resulting in films and coatings with special properties TiC/a:C thin films were deposited by DC magnetron sputtering at 25 °C in argon atmosphere. The films had a thickness of 400 nm and consisted of nanocrystalline TiC and amorphous carbon phases. The average size of TiC crystallites and the thickness of the amorphous carbon matrix strongly depended on deposition parameters, namely on Ti target power. Films deposited at 15 W Ti power consisted of few nanometers small TiC nanocrystallites embedded in a few ten nanometers thick carbon matrix. The increase of Ti content (with increasing Ti power) resulted in larger TiC nanocrystallites and a thinner carbon spacing between t...

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Physiso-Chemical and Thermophysical Properties of Cubic Binary Carbides

Cited by 102 publications

References 11 publications

Physical Properties of the NbC Carbide

Physical Properties of the NbC Carbide

Electronic structure and optical properties of TaC from the first principles calculation

Examination of nanocrystalline TiC/amorphous C deposited thin films

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