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Phase Formation, Crystallography, and Ionic Conductivity of Lithium Manganese Orthosilicates. | LitMetric
On the orthosilicate join, LiSiO-MnSiO, the new phase LiMnSiO and a range of LiMnSiO solid solutions with ∼0.76 ≤ x ≤ 1 have been prepared by high-temperature, solid-state reaction and characterized. LiMnSiO is orthorhombic, space group Pnma, with a = 10.722(3) Å, b = 6.239(2) Å, and c = 5.052(3) Å. A combined analysis of X-ray and neutron powder diffraction data show that its structure is derived from the γ tetrahedral structural family typified by LiPO, but with additional Li in partially occupied, distorted octahedral sites. These octahedral sites are linked by a combination of edge- and face-sharing, similar to that in the nickel arsenide structure and their partial occupancy is responsible for an Li ion conductivity of, for example, ∼ 1 × 10 S cm at 60 °C, with activation energy 0.93(1) eV, which is many orders of magnitude higher than that of LiMnSiO.
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