| People | Locations | Statistics |
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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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Daneu, Nina
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2024Mechanochemical preparation of nanocrystalline stannite/chatkalite composite: kinetics of synthesis and thermoelectric propertiescitations
- 2024The intrinsic twinning and enigmatic twisting of aragonite crystalscitations
- 2024Thermally Stable Capacitive Energy-Density and Colossal Electrocaloric and Pyroelectric Effects of Sm-Doped Pb(Mg 1/3 Nb 2/3 )O 3 –PbTiO 3 Thin Filmscitations
- 2023Non-stoichiometry and its implications for the properties of PMN–PT thin filmscitations
- 2023Thermoelectric properties of pseudobrookite-based ceramics prepared from natural Fe-Ti-rich heavy mineral sand concentratecitations
- 2023Thermoelectric properties of pseudobrookite-based ceramics prepared from natural Fe-Ti-rich heavy mineral sand concentratecitations
- 2023The manipulation of natural mineral chalcopyrite CuFeS<sub>2</sub><i>via</i> mechanochemistry: properties and thermoelectric potentialcitations
- 2022Formation of contact and multiple cyclic cassiterite twins in SnO2-based ceramics co-doped with cobalt and niobium oxides
- 2022Formation of contact and multiple cyclic cassiterite twins in SnO 2 -based ceramics co-doped with cobalt and niobium oxides
- 2020Twinning in SnO 2 -based ceramics doped with CoO- and Nb 2 O 5 : morphology of multiple twins revealed by electron backscatter diffractioncitations
- 2020Enhanced thermoelectric performance of chalcopyrite nanocomposite via co-milling of synthetic and natural minerals ; Zvýšená termoelektrická účinnost chalkopyritového nanokompozitu pomocí společného mletí syntetických a přírodních minerálůcitations
- 2020A scalable synthesis route for multiscale defect engineering in the sustainable thermoelectric quaternary sulfide Cu26V2Sn6S32citations
- 2018A new complex ternary phase in the Al-Cr-Sc push-pull alloycitations
- 2018Structural characterization of Inversion Boundaries in Doped ZnO
- 2017TEM study of basal-plane inversion boundaries in Sn‐Doped ZnO
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article
The intrinsic twinning and enigmatic twisting of aragonite crystals
Abstract
<jats:p>It is generally accepted that aragonite crystals of biogenic origin are characterized by significantly higher twin densities compared to samples formed during geological processes. Based on our single crystal X-ray diffraction (SCXRD) and transmission electron microscopy (TEM) study of aragonite crystals from various localities, we show that in geological aragonites, the twin densities are comparable to those of the samples from crossed lamellar zones of molluscs shells. The high twin density is consistent with performed calculations, according to which the Gibbs free energy of twin-free aragonite is close to that of periodically twinned aragonite structure. In some cases, high twin densities result in the appearance of diffuse scattering in SCXRD patterns. The obtained TEM and optical micrographs show that besides the twin boundaries (TBs) of growth origin, there are also TBs and especially stacking faults that were likely formed as the result of local strain compensation. SCXRD patterns of the samples from Tazouta, in addition to diffuse scattering lines, show Debye arcs in the<jats:inline-formula><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mrow><mml:msup><mml:mi>a</mml:mi><mml:mo>∗</mml:mo></mml:msup><mml:msup><mml:mi>b</mml:mi><mml:mo>∗</mml:mo></mml:msup></mml:mrow></mml:math></jats:inline-formula>plane. These Debye arcs are present only on one side of the Bragg reflections and have an azimuthal extent of nearly 30°, making the whole symmetry of the diffraction pattern distinctly chiral, which has not yet been reported for aragonite. By analogy with biogenic calcite crystals, we associate these arcs with the presence of misoriented subgrains formed as a result of crystal twisting during growth.</jats:p>