Unprecedented rock-salt ordering of A and B cations in the double perovskite Nd<sub>2−x</sub>Ca<sub>x</sub>MgTiO<sub>6−δ</sub> and defect association
- Teresa Azcondo, M. 45678
- Boulahya, Khalid 910111213
- Ritter, Clemens 123
- García-Alvarado, Flaviano 45678
- Amador, Ulises 45678
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1
Institut Laue-Langevin
info
- 2 BP 156-38042 Grenoble Cedex 9
- 3 France
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4
Universidad CEU San Pablo
info
- 5 CEU Universities
- 6 Facultad de Farmacia
- 7 Departamento de Química y Bioquímica
- 8 Urbanización Montepríncipe
- 9 Departamento de Química Inorgánica
- 10 Facultad de Química
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11
Universidad Complutense de Madrid
info
- 12 E-28040 Madrid
- 13 Spain
ISSN: 1477-9226, 1477-9234
Année de publication: 2019
Volumen: 48
Número: 36
Pages: 13651-13661
Type: Article
D'autres publications dans: Dalton Transactions
Résumé
The partial substitution of up to 5% Nd+3 by Ca+2 results in the oxide Nd1.90Ca0.10MgTiO5.94 that presents some remarkable structural features with a noticeable influence on its properties. In this oxide with a monoclinic perovskite-like structure and an octahedral tilting scheme (a−a−b+), both A- and B-ions are arranged in a rock-salt like manner, representing therefore the first example of a type of perovskite theoretically predicted. Besides this unprecedented arrangement of A- and B-ions, the oxygen vacancies created through doping with acceptor ions are trapped by association with the acceptor defects Image ID:c9dt02768h-t1.gif and hence the mobility of these vacancies is strongly limited. The oxygen conductivity of the substituted material is lower and the activation energy for oxygen motion is higher than those of the parent oxide, in which the concentration of anion vacancies is only due to intrinsic defects.
Information sur le financement
Financeurs
- Agencia Estatal de Investigación
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European Regional Development Fund
- MAT2016-78362-C4-1-R
- Comunidad de Madrid
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