La Substitution into the Melilite Derivative CaGaO: Prediction, Synthesis and Ionic Conductivity.

Melilite-type gallates of general formula REAEGaO are of interest for their ability to host mobile interstitial oxide ions in [GaO] layers. The crystal structure of CaGaO is closely related to melilite, with [GaO] layers stacked in a more complex way to accommodate an additional 0.5 interlayer cations per formula unit, suggesting the potential for similar oxide ion conduction behavior.

Stabilization of the Trigonal Langasite Structure in CaGaZnGeO (0 ≤ ≤ 1) with Partial Ordering of Three Isoelectronic Cations Characterized by a Multitechnique Approach.

Crystallization of oxide glasses rich in Zn, Ga, and Ge is of interest for the synthesis of new transparent ceramics. In this context, we report the identification and detailed structural characterization of a new solid solution CaGaZnGeO (0 ≤ ≤ 1). These compounds adopt the trigonal langasite structure type, offering three possible crystallographic sites for the coordination of isoelectronic Zn, Ga, and Ge.

Highly Transparent Fluorotellurite Glass-Ceramics: Structural Investigations and Luminescence Properties.

Crystallization from glass can lead to the stabilization of metastable crystalline phases, which offers an interesting way to unveil novel compounds and control the optical properties of resulting glass-ceramics. Here, we report on a crystallization study of the ZrF-TeO glass system and show that under specific synthesis conditions, a previously unreported TeZrOF zirconium oxyfluorotellurite antiglass phase can be selectively crystallized at the nanometric scale within the 65TeO-35ZrF amorphous matrix. This leads to highly transparent glass-ceramics in both the visible and near-infrared ranges.

Nd-doped transparent tellurite ceramics bulk lasers.

We report on the laser emission of the polycrystalline ceramic obtained from the full and congruent crystallization of the parent glass 1Nd:75TeO-12.5BiO-12.5NbO composition.

Light yield sensitization by X-ray irradiation of the BaAl4O7:Eu(2+)ceramic scintillator obtained by full crystallization of glass.

We report the scintillation properties of BaAl4O7:Eu(2+), a transparent polycrystalline ceramic prepared by full and congruent crystallization of glass. We show that a small deviation from the stoichiometric composition as well as thermal treatment duration play a crucial role in the formation of charge carrier traps, leading to a strong influence on the scintillation yield. We demonstrate that when the traps are not entirely removed, X-ray irradiation allows them to be permanently filled in order to significantly enhance the scintillation output.