Structure and morphology of niobium suboxides

Y. Monfort; A. Maisseu; G. Allais; A. Deschanvres; P. Delavignette

doi:10.1002/pssa.2210150115

Structure and morphology of niobium suboxides

Y. Monfort, A. Maisseu, G. Allais, A. Deschanvres, P. Delavignette

Research output › peer-review

Abstract

The first stages of oxidation of niobium (NbO_x) have been studied by electon microscopy. Two phases, called NbO_xI and II were detected. A study of NbO_z will be published elsewhere. Niobium has been oxidized by a wet argon flow on thin foils or powders, heated at temperatures from 350 up to 400°C. NbO_xI, which has the composition Nb₈O to Nb_6.5O, is tetragonal: a = b = 3.38 Å and c = 3.27 Å. Superstructure spots appear in electron diffraction which are not simple fractions of the basic reciprocal lattice. This superstructure is explained by a particular occupation of interstitial sites of niobium. The NbO_xII phase, corresponding to the composition Nb₆O, is tetragonal too, with a = b = 3.34 Å and c = 3.278 Å. It is characterized by a superstructure a′ = 4 d₁₁₀Nb, b′ = 4 d₁₁₀Nb, c′ = 3 d₀₀₁Nb (the small deformations being neglected). The structure of NbO_xII has been determined.

Original language	English
Pages (from-to)	129-142
Number of pages	14
Journal	physica status solidi (a)
Volume	15
Issue number	1
DOIs	https://doi.org/10.1002/pssa.2210150115
State	Published - 16 Jan 1973

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1002/pssa.2210150115

Cite this

@article{0c37f5c64c29454a85e71e3685984987,

title = "Structure and morphology of niobium suboxides",

abstract = "The first stages of oxidation of niobium (NbOx) have been studied by electon microscopy. Two phases, called NbOxI and II were detected. A study of NbOz will be published elsewhere. Niobium has been oxidized by a wet argon flow on thin foils or powders, heated at temperatures from 350 up to 400°C. NbOxI, which has the composition Nb8O to Nb6.5O, is tetragonal: a = b = 3.38 {\AA} and c = 3.27 {\AA}. Superstructure spots appear in electron diffraction which are not simple fractions of the basic reciprocal lattice. This superstructure is explained by a particular occupation of interstitial sites of niobium. The NbOxII phase, corresponding to the composition Nb6O, is tetragonal too, with a = b = 3.34 {\AA} and c = 3.278 {\AA}. It is characterized by a superstructure a′ = 4 d110Nb, b′ = 4 d110Nb, c′ = 3 d001Nb (the small deformations being neglected). The structure of NbOxII has been determined.",

author = "Y. Monfort and A. Maisseu and G. Allais and A. Deschanvres and P. Delavignette",

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T1 - Structure and morphology of niobium suboxides

AU - Monfort, Y.

AU - Maisseu, A.

AU - Allais, G.

AU - Deschanvres, A.

AU - Delavignette, P.

PY - 1973/1/16

Y1 - 1973/1/16

N2 - The first stages of oxidation of niobium (NbOx) have been studied by electon microscopy. Two phases, called NbOxI and II were detected. A study of NbOz will be published elsewhere. Niobium has been oxidized by a wet argon flow on thin foils or powders, heated at temperatures from 350 up to 400°C. NbOxI, which has the composition Nb8O to Nb6.5O, is tetragonal: a = b = 3.38 Å and c = 3.27 Å. Superstructure spots appear in electron diffraction which are not simple fractions of the basic reciprocal lattice. This superstructure is explained by a particular occupation of interstitial sites of niobium. The NbOxII phase, corresponding to the composition Nb6O, is tetragonal too, with a = b = 3.34 Å and c = 3.278 Å. It is characterized by a superstructure a′ = 4 d110Nb, b′ = 4 d110Nb, c′ = 3 d001Nb (the small deformations being neglected). The structure of NbOxII has been determined.

AB - The first stages of oxidation of niobium (NbOx) have been studied by electon microscopy. Two phases, called NbOxI and II were detected. A study of NbOz will be published elsewhere. Niobium has been oxidized by a wet argon flow on thin foils or powders, heated at temperatures from 350 up to 400°C. NbOxI, which has the composition Nb8O to Nb6.5O, is tetragonal: a = b = 3.38 Å and c = 3.27 Å. Superstructure spots appear in electron diffraction which are not simple fractions of the basic reciprocal lattice. This superstructure is explained by a particular occupation of interstitial sites of niobium. The NbOxII phase, corresponding to the composition Nb6O, is tetragonal too, with a = b = 3.34 Å and c = 3.278 Å. It is characterized by a superstructure a′ = 4 d110Nb, b′ = 4 d110Nb, c′ = 3 d001Nb (the small deformations being neglected). The structure of NbOxII has been determined.

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