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2018
ACL
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M.Boyer, X.Yang, A.J.Fernandez Carrion, Q.Wang, E.Véron, C.Genevois, L.Hennet, G.Matzen, E.Suard, D.Thiaudière, C.Castro, D.Pelloquin, X.Kuang, M.Allix, 'First transparent oxide ion conducting ceramics synthesized by full crystallization from glass', J. Mater. Chem. A 6 5276-5289 (2018) doi:10.1039/c7ta07621e
We propose here to use full crystallization from glass as an innovative process to elaborate completely
dense transparent oxide conductors. This is demonstrated in the case of new non-stoichiometric
Ln1+xSr1xGa3O7+d (Ln ¼ Eu, Gd or Tb) melilite ceramics which show bulk conductivity greater than
0.02 S cm1 at 500 C. Full crystallization from glass is used here as an alternative method to
conventional solid state synthesis in order to elaborate new crystalline phases, i.e. melilite compositions
with small rare earth elements, which could not be synthesized by a solid state reaction. The materials
are stable up to 800 C under cycled conductivity measurement conditions. Moreover, as melilite
compositions show similar glass and crystalline phase densities, the process can produce fully dense
ceramics with thin grain boundaries. Coupled to the limited birefringence of the melilite structure, such
materials retain some of the glass transparency during crystallization, leading to the first transparent
oxide ion conducting ceramics. This work may open a way to a new class of fully dense, and possibly
transparent, solid state electrolytes.
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