Incommensurate composite modulated Nb sub 2 Zr sub x minus 2 O sub 2x+1 : X = 7. 1-10. 3

Incommensurate composite modulated Nb sub 2 Zr sub x minus 2 O sub 2x+1 : X = 7. 1-10. 3

The compound Nb{sub 2}Zr{sub x{minus}2}O{sub 2x+1} has been studied by x-ray powder diffraction and transmission electron microscopy. It was previously thought to be an homologous series M{sub n}O{sub 2n+2} (n {triple bond} 2x, M {double bond} metal) but is more correctly described as a Type II, or...

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Veröffentlicht in:Journal of solid state chemistry 1990-10, Vol.88:2
Hauptverfasser: Thompson, J.G., Withers, R.L., Barlow, P.J., Hyde, B.G., Sellar, J.
Format: Artikel
Sprache:eng
Schlagworte:
360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies
CHALCOGENIDES
COHERENT SCATTERING
DATA
DIFFRACTION
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
INFORMATION
LATTICE PARAMETERS
MATERIALS SCIENCE
MEASURING METHODS
MICROSCOPY
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
STRUCTURAL CHEMICAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES
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Zusammenfassung:The compound Nb{sub 2}Zr{sub x{minus}2}O{sub 2x+1} has been studied by x-ray powder diffraction and transmission electron microscopy. It was previously thought to be an homologous series M{sub n}O{sub 2n+2} (n {triple bond} 2x, M {double bond} metal) but is more correctly described as a Type II, or composite, modulated structure. Reciprocal space is dominated by a conspicuous set of strong matrix reflections G corresponding to the metrically orthorhombic, average metal subcell (A--a, a{sub M} {approx equal} 5.1, b{sub M} {approx equal} 4.9, c{sub M} {approx equal} 5.2 {angstrom}).
ISSN:0022-4596
1095-726X
DOI:10.1016/0022-4596(90)90243-Q