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X-ray powder diffraction reference patterns for Bi1−xPbxOCuSe
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Personen und Körperschaften: | , , , |
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Titel: |
X-ray powder diffraction reference patterns for Bi1−xPbxOCuSe |
In: | Powder Diffraction, 31, 2016, 3, S. 223-228 |
veröffentlicht: |
Cambridge University Press (CUP)
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Umfang: | 223-228 |
ISSN: |
0885-7156 1945-7413 |
DOI: | 10.1017/s0885715616000361 |
Zusammenfassung: | <jats:p>The structures and powder X-ray reference diffraction patterns of the “natural superlattice” series Bi<jats:sub>1−<jats:italic>x</jats:italic></jats:sub>Pb<jats:sub><jats:italic>x</jats:italic></jats:sub>OCuSe (<jats:italic>x</jats:italic> = 0, 0.02, 0.04, 0.06, 0.08, and 0.10) have been investigated. As the ionic radius of Pb<jats:sup>2+</jats:sup> is greater than that of Bi<jats:sup>3+</jats:sup>, the unit-cell volume of Bi<jats:sub>1−<jats:italic>x</jats:italic></jats:sub>Pb<jats:sub><jats:italic>x</jats:italic></jats:sub>OCuSe increases progressively from <jats:italic>x</jats:italic> = 0 to 0.1, namely, from 137.868(5) to 139.172(11) Å<jats:sup>3</jats:sup>, as expected. The structure of Bi<jats:sub>1−<jats:italic>x</jats:italic></jats:sub>Pb<jats:sub><jats:italic>x</jats:italic></jats:sub>OCuSe is built from [Bi<jats:sub>2(1−<jats:italic>x</jats:italic>)</jats:sub>Pb<jats:sub>2<jats:italic>x</jats:italic></jats:sub>O<jats:sub>2</jats:sub>]<jats:sup>2(1−<jats:italic>x</jats:italic>)+</jats:sup> layers normal to the <jats:italic>c</jats:italic>-axis alternating with [Cu<jats:sub>2</jats:sub>Se<jats:sub>2</jats:sub>]<jats:sup>2(1−<jats:italic>x</jats:italic>)−</jats:sup> fluorite-like layers. Pb substitution in the Bi site of Bi<jats:sub>1−<jats:italic>x</jats:italic></jats:sub>Pb<jats:sub><jats:italic>x</jats:italic></jats:sub>OCuSe leads to the weakening of the “bonding” between the [Bi<jats:sub>2(1−<jats:italic>x</jats:italic>)</jats:sub>Pb<jats:sub>2<jats:italic>x</jats:italic></jats:sub>O<jats:sub>2</jats:sub>]<jats:sup>2(1−<jats:italic>x</jats:italic>)+</jats:sup> and the [Cu<jats:sub>2</jats:sub>Se<jats:sub>2</jats:sub>]<jats:sup>2(1−<jats:italic>x</jats:italic>)−</jats:sup> layers. Powder patterns of Bi<jats:sub>1−<jats:italic>x</jats:italic></jats:sub>Pb<jats:sub><jats:italic>x</jats:italic></jats:sub>OCuSe were submitted to be included in the Powder Diffraction File.</jats:p> |
Format: | E-Article |
Quelle: | Cambridge University Press (CUP) (CrossRef) |
Sprache: | Englisch |