Papers by Author: Serge Hoste

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Authors: Isabel Van Driessche, G. Penneman, J.S. Abell, E. Bruneel, Serge Hoste
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Authors: G. Penneman, Isabel Van Driessche, E. Bruneel, Serge Hoste
501
Authors: Kim Celis, Isabel Van Driessche, R. Mouton, G. Vanhoyland, Serge Hoste
807
Authors: E. Bruneel, T. Oku, Joris Degrieck, Isabel Van Driessche, Serge Hoste
637
Authors: Christy De Meyer, Isabel Van Driessche, Serge Hoste
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Authors: Klaartje de Buysser, Serge Hoste, Isabel Van Driessche
Abstract: The thermal expansion of a ceramic material in general leads to a positive thermal expansion coefficient (α). In the last decennium, several families of materials which exhibit negative thermal expansion, arising from a specific geometrical effect in their so-called open framework structures, have been discovered. Usually, this negative thermal expansion coefficient is small, anisotropic and the phenomena occur in a very small temperature interval. ZrW2O8 is an exception because of its large and isotropic negative thermal expansion coefficient (NTE) in a temperature range from 0.5K to 1050K. A cubic symmetry is found over the entire stability range with a phase transition from α-ZrW2O8 to β-ZrW2O8 near 430K. This phase transition is noticed by a change in α. The aqueous citrate-gel method is a suitable synthesis route for negative thermal expansion ceramics and will give a fine, pure and homogenous oxide mixture, well suitable for the preparation of ZrW2O8. The expansion coefficient of α–ZrW2O8 is -11 μm/m K whereas for the β- ZrW2O8 a value of -3 is obtained.
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Authors: E. Bruneel, T. Oku, G. Penneman, Isabel Van Driessche, Serge Hoste
1473
Authors: Isabel Van Driessche, G. Penneman, Christy De Meyer, I. Stambolova, E. Bruneel, Serge Hoste
479
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