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- W4281937288 abstract "Crystallization of oxide glasses rich in Zn2+, Ga3+, and Ge4+ 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 Ca3Ga2-2xZnxGe4+xO14 (0 ≤ x ≤ 1). These compounds adopt the trigonal langasite structure type, offering three possible crystallographic sites for the coordination of isoelectronic Zn2+, Ga3+, and Ge4+. We used neutron diffraction to determine distributions of Ga3+/Ge4+ and Zn2+/Ge4+ in the simpler end members Ca3Ga2Ge4O14 and Ca3ZnGe5O14, while for the complex intermediate member Ca3GaZn0.5Ge4.5O14, we used an original approach combining quantitative 2D analysis of atomic-resolution STEM-EDS maps with neutron diffraction. This revealed that, across the solid solution, the tetrahedral D sites remain fully occupied by Ge4+, while Zn2+, Ga3+, and the remaining Ge4+ are shared between octahedral B- and tetrahedral C sites in proportions that depend upon their relative ionic radii. The adoption of the trigonal langasite structure by glass-crystallized Ca3ZnGe5O14, a compound that was previously observed only in a distorted monoclinic langasite polymorph, is attributed to substantial disorder between Zn2+ and Ge4+ over the B and C sites. The quantitative 2D refinement of atomic-resolution STEM-EDS maps is applicable to a wide range of materials where multiple cations with poor scattering contrast are distributed over different crystallographic sites in a crystal structure." @default.
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- W4281937288 date "2022-06-03" @default.
- W4281937288 modified "2023-10-14" @default.
- W4281937288 title "Stabilization of the Trigonal Langasite Structure in Ca<sub>3</sub>Ga<sub>2–2<i>x</i></sub>Zn<sub><i>x</i></sub>Ge<sub>4+<i>x</i></sub>O<sub>14</sub> (0 ≤ <i>x</i> ≤ 1) with Partial Ordering of Three Isoelectronic Cations Characterized by a Multitechnique Approach" @default.
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- W4281937288 doi "https://doi.org/10.1021/acs.inorgchem.2c01173" @default.
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