| 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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Thompson, Stephen
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2024Electron Beam and Thermal Stabilities of MFM-300(M) Metal-Organic Frameworkscitations
- 2019Sub-lattice polarization states in anti-ferroelectrics and their relaxation processcitations
- 2017New synchrotron powder diffraction facility for long-duration experimentscitations
- 2015Advances in synchrotron x-ray diffraction and transmission electron microscopy techniques for the investigation of microstructure evolution in proton- and neutron-irradiated zirconium alloyscitations
- 2014The fabrication of a bifunctional oxygen electrode without carbon components for alkaline secondary batteriescitations
- 2011High-resolution synchrotron X-ray diffraction studies of size and strain effects in a complex Al–Fe–Cr–Ti alloy
- 2007A novel approach to dynamic modelling of polymer extrusion for improved process controlcitations
- 2007A Soft Sensor for viscosity control of polymer extrusioncitations
- 2004The structure and thermal expansion behaviour of ikaite, CaCO3. 6H2O, from T = 114 to T = 293 Kcitations
Places of action
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article
The structure and thermal expansion behaviour of ikaite, CaCO3. 6H2O, from T = 114 to T = 293 K
Abstract
<jats:title>Abstract</jats:title><jats:p>The hydrous calcium carbonate mineral ikaite (CaCO<jats:sub>3</jats:sub>.6H<jats:sub>2</jats:sub>O) forms in nature at low temperature in carbonate- and Ca-rich waters. Ikaite crystallizes in the spacegroup C2/<jats:italic>c</jats:italic>, and consists of CaCO<jats:sub>3</jats:sub>.6H<jats:sub>2</jats:sub>O units with Ca ions coordinated by eight oxygens, six from H<jats:sub>2</jats:sub>O and two from the carbonate group. Hydrogen bonding links CaCO<jats:sub>3</jats:sub>.6H<jats:sub>2</jats:sub>O moieties to form the crystal structure.</jats:p><jats:p>We have used synchrotron X-ray powder diffraction at <jats:italic>T</jats:italic> = 243 K to refine the monoclinic structure of ikaite, and have measured unit-cell parameters of ikaite between <jats:italic>T</jats:italic> = 114 K and <jats:italic>T</jats:italic> = 293 K. Anisotropic thermal expansion in ikaite is evident, with the smallest relative increase occurring along the <jats:italic>b</jats:italic> direction parallel to 2-fold axes. The contribution of hydrogen bonding to thermal expansion is assessed by comparison of our data with previously published data for deuterated ikaite, ice and gypsum. Ikaite exhibits a coefficient of volume expansion intermediate between that of ice (Ih) and of deuterated gypsum (CaSO<jats:sub>4</jats:sub>.2D<jats:sub>2</jats:sub>O) between <jats:italic>T</jats:italic> = 114 K and <jats:italic>T</jats:italic> = 293 K.</jats:p>