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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Maclaren, Ian
University of Glasgow
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (18/18 displayed)
- 2024A method for crystallographic mapping of an alpha‐beta titanium alloy with nanometre resolution using scanning precession electron diffraction and open‐source software libraries
- 2021Correlative chemical and structural nanocharacterization of a pseudo‐binary 0.75Bi(Fe 0.97 Ti 0.03 )O 3 –0.25BaTiO 3 ceramiccitations
- 2021Correlative chemical and structural nanocharacterization of a pseudo-binary 0.75Bi(Fe0.97Ti0.03)O3–0.25BaTiO3 ceramiccitations
- 2020Nano-scale characterisation of tri-modal microstructures in TIMETAL<sup>®</sup> 575citations
- 2020A comparison of a direct electron detector and a high-speed video camera for a scanning precession electron diffraction phase and orientation mappingcitations
- 2020Detectors—the ongoing revolution in scanning transmission electron microscopy and why this important to material characterizationcitations
- 2019Three-dimensional subnanoscale imaging of unit cell doubling due to octahedral tilting and cation modulation in strained perovskite thin filmscitations
- 2019Strain analysis of Ge micro disk using precession electron diffractioncitations
- 2019Strain anisotropy and magnetic domains in embedded nanomagnetscitations
- 2017Characterisation of amorphous molybdenum silicide (MoSi) superconducting thin films and nanowirescitations
- 2017Route to achieving perfect B-site ordering in double perovskite thin filmscitations
- 2016Tungsten bronze barium neodymium titanate (Ba 6-3n Nd 8+2n Ti 18 O 54 ) an intrinsic nanostructured material and its defect distributioncitations
- 2016Tungsten Bronze Barium Neodymium Titanate (Ba(6-3n)Nd(8+2n)Ti(18)O(54))citations
- 2015Stabilisation of Fe2O3-rich Perovskite Nanophase in Epitaxial Rare-earth Doped BiFeO3 Filmscitations
- 2015Stabilisation of Fe2O3-rich perovskite nanophase in epitaxial rare-earth doped BiFeO3 filmscitations
- 2015Spectrum imaging of complex nanostructures using DualEELS: I. digital extraction replicascitations
- 2015Utilising DualEELS to probe the nanoscale mechanisms of the corrosion of Zircaloy-4 in 350 °C pressurised watercitations
- 2014Investigating the medium range order in amorphous Ta 2 O 5 coatingscitations
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article
Tungsten Bronze Barium Neodymium Titanate (Ba(6-3n)Nd(8+2n)Ti(18)O(54))
Abstract
<p>We investigated the structure of the tungsten bronze barium neodymium titanates Ba(6-3n)Nd(8+2n)Ti(18)O(54), which are exploited as microwave dielectric ceramics. They form a complex nanostructure, which resembles a nanofilm with stacking layers of ∼12 Å thickness. The synthesized samples of Ba(6-3n)Nd(8+2n)Ti(18)O(54) (n = 0, 0.3, 0.4, 0.5) are characterized by pentagonal and tetragonal columns, where the A cations are distributed in three symmetrically inequivalent sites. Synchrotron X-ray diffraction and electron energy loss spectroscopy allowed for quantitative analysis of the site occupancy, which determines the defect distribution. This is corroborated by density functional theory calculations. Pentagonal columns are dominated by Ba, and tetragonal columns are dominated by Nd, although specific Nd sites exhibit significant concentrations of Ba. The data indicated significant elongation of the Ba columns in the pentagonal positions and of the Nd columns in tetragonal positions involving a zigzag arrangement of atoms along the b lattice direction. We found that the preferred Ba substitution occurs at Nd[3]/[4] followed by Nd[2] and Nd[1]/[5] sites, which is significantly different to that proposed in earlier studies. Our results on the Ba(6-3n)Nd(8+2n)Ti(18)O(54) "perovskite" superstructure and its defect distribution are particularly valuable in those applications where the optimization of material properties of oxides is imperative; these include not only microwave ceramics but also thermoelectric materials, where the nanostructure and the distribution of the dopants will reduce the thermal conductivity.</p>