Accurate measuring of the density of solids, using helium as a gaseous medium

Waterman, H. I.; Wolfs, P.M.

doi:10.1007/bf03185042

Appl. sci. Res.

1957

DOI: 10.1007/bf03185042

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Accurate measuring of the density of solids, using helium as a gaseous medium

H. I. Waterman¹,

P.M. Wolfs²

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1965

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Structure des Oxydes de Niobium: Transformation de Structure du Nb₂O₅-γ en Nb₂O₅-α et la Formation du NbO₂

Terao¹

1965

Jpn. J. Appl. Phys.

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The formation of several intermediate oxides of niobium, produced in the course of transformation γ-Nb2O5→ α-Nb2O5 and the reaction Nb2O5+Nb→ NbO2, has been studied by X-ray diffraction. The structure transformation γ→α is accomplished by a passage through two intermediate stages, γ' and β. The γ' form is a new niobium oxide, interpreted to have a monoclinic lattice with parameters a=7.348Å, b=5.962Å, c=13.646Å and β=115°30'. The γ-form has been considered hitherto to be a pentoxide having 12Nb2O5-molecules in its elementary lattice. The helium method of density measurement showed, however, two possibilities for the composition of the γ-form. These are either a pentoxide which has 14Nb2O5-molecules in its elementary lattice or Nb28O69(NbO2.464). The form II, which we have observed in the transformation Nb2O5→ NbO2 and reported in our previous publication, is confirmed to be Nb12O29(NbO2.417).

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Structure des Oxydes de Niobium: Transformation de Structure du Nb₂O₅-γ en Nb₂O₅-α et la Formation du NbO₂

Terao¹

1965

Jpn. J. Appl. Phys.

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Accurate measuring of the density of solids, using helium as a gaseous medium

Cited by 1 publication

References 14 publications

Structure des Oxydes de Niobium: Transformation de Structure du Nb₂O₅-γ en Nb₂O₅-α et la Formation du NbO₂

Structure des Oxydes de Niobium: Transformation de Structure du Nb₂O₅-γ en Nb₂O₅-α et la Formation du NbO₂

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Accurate measuring of the density of solids, using helium as a gaseous medium

Cited by 1 publication

References 14 publications

Structure des Oxydes de Niobium: Transformation de Structure du Nb2O5-γ en Nb2O5-α et la Formation du NbO2

Structure des Oxydes de Niobium: Transformation de Structure du Nb2O5-γ en Nb2O5-α et la Formation du NbO2

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Structure des Oxydes de Niobium: Transformation de Structure du Nb₂O₅-γ en Nb₂O₅-α et la Formation du NbO₂

Structure des Oxydes de Niobium: Transformation de Structure du Nb₂O₅-γ en Nb₂O₅-α et la Formation du NbO₂