The melting point and other properties of the lower oxides of niobium

Kolchin, O. P.; Sumarokova, N.V.

doi:10.1007/bf01480227

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…This corresponds, in principle, to our statement of resistance levels. The resistance levels have been also observed in thin tin films 9 and in thin indium wires. 10 The velocity of propagation of a superconducting domain boundary in bulk tin in a horizontal magnetic field was measured by Faber.…”

Section: Comparison With Previous Workmentioning

confidence: 85%

Fluctuations of the Resistance and Resistance Levels in the Intermediate State of Superconductors

Lalevic

1962

Phys. Rev.

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It is demonstrated that fluctuations of the resistance in the current-induced intermediate region of both hard and soft superconductors are caused by normal or superconducting domain motion. The amplitude and frequency of the resistance fluctuations have been studied as a function of supercooling, and the velocity of the domain boundary propagation estimated. Definite evidence for both stable and unstable resistance (i.e., energy) levels in the intermediate state is reported. The observations made on vanadium and tantalum wires have a bearing on certain aspects of the properties of superconducting solenoids, in particular, the relation of the critical current to the external magnetic field.

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Section: Comparison With Previous Workmentioning

confidence: 85%

Fluctuations of the Resistance and Resistance Levels in the Intermediate State of Superconductors

Lalevic

1962

Phys. Rev.

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“…In fact, the chemical formula of the niobium monoxide is expressed by Nb 3 O 3 , whose crystal structure is regarded as a vacancy-ordered structure (a = 4.2101 Å), 4 or a pseudorocksalt structure with 25% of both niobium (Nb) and oxygen (O) atoms missing from the ideal rock-salt arrangement (Nb 4 O 4 ), as depicted in Figure 1a. Nb 3 O 3 reportedly surpasses other transition metal monoxides in its exceptional structural stability, remaining in a crystalline solid state up to its melting point of 2213 K 5 and withstanding high pressure up to 7.7 GPa without any phase transitions. 6 Moreover, crystalline Nb 3 O 3 is metallic and becomes superconducting below 1.38 K. 7 Hu et al have proposed in their recent studies that Nb 3 O 3 owes these unusual properties to its space aromaticity that results from the octahedral Nb 6 structural units.…”

Section: Introductionmentioning

confidence: 99%

Elevating the Superconducting Temperature in Epitaxially Stabilized Rock-Salt NbO

Kimura,

Kaminaga,

Kobayashi

et al. 2024

Chem. Mater.

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Niobium monoxide generally refers to Nb3O3 with a pseudorock-salt structure, which is known as thermodynamically the most stable phase, exhibiting superconductivity below 1.38 K; neither bulk nor thin film form of rock-salt NbO thus has been reported so far. In this study, metastable rock-salt NbO has been successfully synthesized through a nonequilibrium process with vapor deposition. The present synthesis of rock-salt NbO marked its enhancement of superconductivity, whose transition temperature could reach up to 7.4 K, more than 5 times as high as that of the pseudorock-salt Nb3O3. The structure-sensitive electronic properties of the rock-salt NbO will be further discussed not only experimentally but also theoretically with the aid of DFT + U + V calculations.

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“…For clarity, the hypothetical rocksalt and the actual vacancy-ordered crystal structure of niobium monoxide will be referred to as Nb 4 O 4 and Nb 3 O 3 , respectively. Adding to the astonishment, the vacancy order is robust and crystal structure remains stable up until 2213 K, the melting point of niobium monoxide [3,[5][6][7][8].…”

mentioning

confidence: 99%

Electronic signature of the vacancy ordering in NbO(Nb3O3)

et al. 2017

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We investigated the electronic structure of the vacancy-ordered 4d-transition metal monoxide NbO (Nb3O3) using angle-integrated soft-and hard-x-ray photoelectron spectroscopy as well as ultra-violet angle-resolved photoelectron spectroscopy. We found that density-functional-based band structure calculations can describe the spectral features accurately provided that self-interaction effects are taken into account. In the angle-resolved spectra we were able to identify the so-called vacancy band that characterizes the ordering of the vacancies. This together with the band structure results indicates the important role of the very large inter-Nb-4d hybridization for the formation of the ordered vacancies and the high thermal stability of the ordered structure of niobium monoxide.

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The melting point and other properties of the lower oxides of niobium

Cited by 7 publications

References 3 publications

Fluctuations of the Resistance and Resistance Levels in the Intermediate State of Superconductors

Fluctuations of the Resistance and Resistance Levels in the Intermediate State of Superconductors

Elevating the Superconducting Temperature in Epitaxially Stabilized Rock-Salt NbO

Electronic signature of the vacancy ordering in NbO(Nb3O3)

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