High superconducting transition temperatures in the molybdenum carbide family of compounds

Toth, L. E.

doi:10.1016/0022-5088(67)90055-0

Cited by 84 publications

(47 citation statements)

References 12 publications

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“…We note in passing that the only Mo-containing MAX phase known to date is Mo 2 GaC. [16][17][18] Very recently, a closely related phase, a) Author to whom correspondence should be address. Electronic mail: barsoumw@drexel.edu 0021-8979/2015/118(9)/094304/14/$30.00…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical characterization of ordered MAX phases Mo2TiAlC2 and Mo2Ti2AlC3

Anasori

Dahlqvist

Halim

et al. 2015

Journal of Applied Physics

247

180

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Herein, we report on the phase stabilities and crystal structures of two newly discovered ordered, quaternary MAX phases-Mo 2 TiAlC 2 and Mo 2 Ti 2 AlC 3 -synthesized by mixing and heating different elemental powder mixtures of mMo:(3-m)Ti:1.1Al:2C with 1.5 m 2.2 and 2Mo: 2Ti:1.1Al:2.7C to 1600 C for 4 h under Ar flow. In general, for m ! 2 an ordered 312 phase, (Mo 2 Ti)AlC 2 , was the majority phase; for m < 2, an ordered 413 phase (Mo 2 Ti 2 )AlC 3 , was the major product. The actual chemistries determined from X-ray photoelectron spectroscopy (XPS) are Mo 2 TiAlC 1.7 and Mo 2 Ti 1.9 Al 0.9 C 2.5 , respectively. High resolution scanning transmission microscopy, XPS and Rietveld analysis of powder X-ray diffraction confirmed the general ordered stacking sequence to be Mo-Ti-Mo-Al-Mo-Ti-Mo for Mo 2 TiAlC 2 and Mo-Ti-Ti-Mo-Al-Mo-Ti-TiMo for Mo 2 Ti 2 AlC 3 , with the carbon atoms occupying the octahedral sites between the transition metal layers. Consistent with the experimental results, the theoretical calculations clearly show that M layer ordering is mostly driven by the high penalty paid in energy by having the Mo atoms surrounded by C in a face-centered configuration, i.e., in the center of the M nþ1 X n blocks. At 331 GPa and 367 GPa, respectively, the Young's moduli of the ordered Mo 2 TiAlC 2 and Mo 2 Ti 2 AlC 3 are predicted to be higher than those calculated for their ternary end members. Like most other MAX phases, because of the high density of states at the Fermi level, the resistivity measurement over 300 to 10 K for both phases showed metallic behavior. V C 2015 AIP Publishing LLC.

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Section: Introductionmentioning

confidence: 99%

Experimental and theoretical characterization of ordered MAX phases Mo2TiAlC2 and Mo2Ti2AlC3

Anasori

Dahlqvist

Halim

et al. 2015

Journal of Applied Physics

247

180

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“…4 Superconducting behavior below 7 K has been reported. 4,5 More recently a theoretical paper was published, predicting some of its properties.…”

Section: Introductionmentioning

confidence: 99%

“…4 Superconducting behavior below 7 K has been reported. 4,5 More recently a theoretical paper was published, predicting some of its properties. 6 Compared to Nb2GaC and V2GaC, Mo2GaC was predicted to have the highest bulk and lowest shear modulus.…”

Section: Introductionmentioning

confidence: 99%

Mo₂Ga₂C: a new ternary nanolaminated carbide

et al. 2015

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“…To date, among more than 70 synthesized MAX phases [3], bulk superconductivity was discovered for seven systems: Mo 2 GaC [4], Nb 2 SC [5], Nb 2 SnC [6], Nb 2 AsC [7], Ti 2 InC [8], Nb 2 InC [9], and Ti 2 InN [10]. Very recently, a superconducting transition at T C ~ 9.5 K was reported for the eighth MAX phase -Ti 2 GeC [1].…”

Section: Introductionmentioning

confidence: 99%

New MAX Phase Superconductor Ti<sub>2</sub>GeC: A First-principles Study

et al. 2013

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This is the first DFT-based first-principles prediction of the detailed optical and thermodynamic properties, including Vickers hardness and Fermi surface of 211 MAX phase Ti 2 GeC for which superconductivity (T c~ 9.5 K) was reported very recently. The calculated structural properties are in excellent agreement with experiments. Our results on elastic parameters indicate a slight elastic anisotropy and brittleness of the compound. The chemical bonding is seen to be a combination of covalent, ionic and metallic nature. The rather stronger covalent bonding is responsible for its high Vickers hardness of 11.6 GPa. The investigated Fermi surface is formed mainly by the low-dispersive bands, which should be responsible for the presence of superconductivity in Ti 2 GeC. All the optical properties are evaluated and analyzed for two different polarization directions of incident photon. The temperature and pressure dependence of primitive cell volume, thermal expansion coefficient, specific heats, bulk modulus, and Debye temperature of Ti 2 GeC are derived from the quasi-harmonic Debye model with phononic effect and the various implications are discussed in details.

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High superconducting transition temperatures in the molybdenum carbide family of compounds

Cited by 84 publications

References 12 publications

Experimental and theoretical characterization of ordered MAX phases Mo2TiAlC2 and Mo2Ti2AlC3

Experimental and theoretical characterization of ordered MAX phases Mo2TiAlC2 and Mo2Ti2AlC3

Mo₂Ga₂C: a new ternary nanolaminated carbide

New MAX Phase Superconductor Ti<sub>2</sub>GeC: A First-principles Study

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High superconducting transition temperatures in the molybdenum carbide family of compounds

Cited by 84 publications

References 12 publications

Experimental and theoretical characterization of ordered MAX phases Mo2TiAlC2 and Mo2Ti2AlC3

Experimental and theoretical characterization of ordered MAX phases Mo2TiAlC2 and Mo2Ti2AlC3

Mo2Ga2C: a new ternary nanolaminated carbide

New MAX Phase Superconductor Ti<sub>2</sub>GeC: A First-principles Study

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Mo₂Ga₂C: a new ternary nanolaminated carbide