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Synthesis of ZrW2O8 ceramics and composites from aqueous sol-gel precursors

Klaartje De Buysser (UGent) , Serge Hoste (UGent) and Isabel Van Driessche (UGent)
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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.
Keywords
Ceramic, Sol-Gel, Negative Thermal Expansion, Composite, ZrW2O8

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Chicago
De Buysser, Klaartje, Serge Hoste, and Isabel Van Driessche. 2006. “Synthesis of ZrW2O8 Ceramics and Composites from Aqueous Sol-gel Precursors.” In Advances in Science and Technology, ed. Pietro Vincenzini, 45:218–222. Stafa-Zürich, Switzerland: Trans Tech.
APA
De Buysser, K., Hoste, S., & Van Driessche, I. (2006). Synthesis of ZrW2O8 ceramics and composites from aqueous sol-gel precursors. In Pietro Vincenzini (Ed.), ADVANCES IN SCIENCE AND TECHNOLOGY (Vol. 45, pp. 218–222). Presented at the CIMTEC 2006 : 11th International Ceramics Congress ; 4th Forum on New Materials, Stafa-Zürich, Switzerland: Trans Tech.
Vancouver
1.
De Buysser K, Hoste S, Van Driessche I. Synthesis of ZrW2O8 ceramics and composites from aqueous sol-gel precursors. In: Vincenzini P, editor. ADVANCES IN SCIENCE AND TECHNOLOGY. Stafa-Zürich, Switzerland: Trans Tech; 2006. p. 218–22.
MLA
De Buysser, Klaartje, Serge Hoste, and Isabel Van Driessche. “Synthesis of ZrW2O8 Ceramics and Composites from Aqueous Sol-gel Precursors.” Advances in Science and Technology. Ed. Pietro Vincenzini. Vol. 45. Stafa-Zürich, Switzerland: Trans Tech, 2006. 218–222. Print.
@inproceedings{396323,
  abstract     = {The thermal expansion of a ceramic material in general leads to a positive thermal expansion coefficient (\ensuremath{\alpha}). 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 \ensuremath{\alpha}-ZrW2O8 to \ensuremath{\beta}-ZrW2O8 near 430K. This phase transition is noticed by a change in \ensuremath{\alpha}. 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 \ensuremath{\alpha}--ZrW2O8 is -11 \ensuremath{\mu}m/m K whereas for the \ensuremath{\beta}- ZrW2O8 a value of -3 is obtained.},
  author       = {De Buysser, Klaartje and Hoste, Serge and Van Driessche, Isabel},
  booktitle    = {ADVANCES IN SCIENCE AND TECHNOLOGY},
  editor       = {Vincenzini, Pietro},
  isbn         = {9783908158011},
  issn         = {1662-0356},
  keyword      = {Ceramic,Sol-Gel,Negative Thermal Expansion,Composite,ZrW2O8},
  language     = {eng},
  location     = {Acireale, Italy},
  pages        = {218--222},
  publisher    = {Trans Tech},
  title        = {Synthesis of ZrW2O8 ceramics and composites from aqueous sol-gel precursors},
  url          = {http://dx.doi.org/10.4028/www.scientific.net/AST.45.218},
  volume       = {45},
  year         = {2006},
}

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