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Article Dans Une Revue Journal of the European Ceramic Society Année : 2020

New KNbTeO6 transparent tellurate ceramics

Morgane Dolhen
  • Fonction : Auteur
Julie Carreaud
  • Fonction : Auteur
Gaëlle Delaizir
  • Fonction : Auteur
Jean-René Duclère
  • Fonction : Auteur
Marion Vandenhende
  • Fonction : Auteur
Nicolas Tessier-Doyen
  • Fonction : Auteur
Olivier Tantot
Damien Passerieux
Pierre-Eugène Coulon
  • Fonction : Auteur
Sébastien Chenu

Résumé

New transparent defect pyrochlore KNbTeO 6 ceramics were successfully prepared by Spark Plasma Sintering (SPS) of same composition polycrystalline powders elaborated by classic solid-state reaction from oxide precursors (K 2 CO 3 , Nb 2 O 5 , TeO 2) and followed by high energy milling powders. As such precursors are not available as commercial nanopowders, a suitable process has been developed by combining solid-state reactions and high energy milling. The determination of appropriate consolidation conditions and sintering parameters of the green body such prepared, are described in this paper. The resulting ceramic is transparent in both the visible and near infrared range (up to 5.5 μm). The maximum of transmittance is reached in the near infrared region around 2500 nm with a value of 78 % (1 mm thick sample), close to the maximum theoretical value of transmittance. This transparent KNbTeO 6 ceramic demonstrates a homogeneous and dense microstructure with an average grain size less than 500 nm. A small content of secondary phase has been detected by nanoscale observations without drastic effects on transparency. This ceramic exhibits very good mechanical properties similar to the Y 2 O 3 transparent ceramic, as well as interesting dielectric properties in the microwave range. This innovative method should drive the development of new transparent materials with technologically relevant applications.
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Dates et versions

hal-03089327 , version 1 (28-12-2020)

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Morgane Dolhen, Julie Carreaud, Gaëlle Delaizir, Jean-René Duclère, Marion Vandenhende, et al.. New KNbTeO6 transparent tellurate ceramics. Journal of the European Ceramic Society, 2020, 40, pp.4164-4170. ⟨10.1016/j.jeurceramsoc.2020.04.005⟩. ⟨hal-03089327⟩
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