Synthesis of a 12R-type hexagonal perovskite solid solution Sr<sub>3</sub>NdNb<sub>3−x</sub>Ti<sub>x</sub>O<sub>12−δ</sub> and the influence of acceptor doping on electrical properties
- Chinelatto, Adilson L. 12345
- Boulahya, Khalid 1112131415
- Pérez-Coll, Domingo 1234
- Amador, Ulises 1617181920
- Tabacaru, Corina 1234
- Nicholls, Simon 678910
- Hoelzel, Markus 21222324
- Sinclair, Derek C. 678910
- Mather, Glenn C. 1234
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1
Instituto de Cerámica y Vidrio
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2
Consejo Superior de Investigaciones Científicas
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- 3 28049 Madrid
- 4 Spain
- 5 Departamento de Engenharia de Materiais
- 6 Department of Materials Science & Engineering
- 7 Sir Robert Hadfield Building
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8
University of Sheffield
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- 9 Sheffield S1 3JD
- 10 UK
- 11 Departamento de Química Inorgánica I
- 12 Facultad de Ciencias Químicas
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13
Universidad Complutense de Madrid
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- 14 Ciudad Universitaria
- 15 28040 Madrid
- 16 Facultad de Farmacia
- 17 Departamento de Química
- 18 Urbanización Monteprincipe
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19
Universidad CEU San Pablo
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- 20 28668 Madrid
- 21 Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II)
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22
Technical University Munich
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- 23 D-85747 Garching
- 24 Germany
ISSN: 1477-9226, 1477-9234
Año de publicación: 2015
Volumen: 44
Número: 16
Páginas: 7643-7653
Tipo: Artículo
Otras publicaciones en: Dalton Transactions
Resumen
A solid solution forms for Sr3NdNb3−xTixO12−δ with approximate limits 0 ≤ x ≤ 0.06. The system crystallizes with a 12R-type hexagonal perovskite structure in the space group R[3 with combining macron], as determined by neutron diffraction and selected area electron diffraction. The electrical properties of the end members have been investigated by impedance spectroscopy in the temperature range 550–800 °C under various gas atmospheres and as a function of oxygen and water-vapour partial pressure. Proton transport dominates under wet oxidising conditions in the temperature range 550–700 °C, as confirmed by the H+/D+ isotope effect. Acceptor doping considerably enhances proton conductivity with a value of 3.3 × 10−6 S cm−1 for the bulk response of x = 0.06 at 700 °C in moistened air. The presence of a −¼ slope for both doped and undoped samples in the range 10−19 ≤ pO2 ≤ 10−8 atm at 900 °C indicates n-type transport under reducing conditions following the extrinsic model attributable to acceptor centres. The conductivity is essentially independent of pO2 at 600 °C under dry oxidising conditions, consistent with oxide-ion transport; a positive power-law dependence at higher temperature indicates extrinsic behaviour and a significant electron–hole contribution. The dielectric constant at RT of nominally stoichiometric Sr3NdNb3O12 is εr ∼ 37, with a moderately high quality factor of Q × f ∼ 16 400 GHz at fr ∼ 6.4 GHz. The temperature coefficient of resonant frequency of x = 0 is τf ∼ 12 ppm °C−1, which lowers to −3 ppm °C−1 for the Ti-doped phase x = 0.06.
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