Journal
INORGANIC CHEMISTRY
Volume 47, Issue 21, Pages 9941-9945Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic801102t
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- National Science Foundation [DMR:0450103, DMR: 0804209]
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Single crystals of Sr3Li6M2O11 (M = Nb, Ta) were grown out of a high-temperature Sr(OH)(2)/LiOH/KOH flux. The single crystal X-ray diffraction data were indexed to the orthorhombic Pmma system, with a = 10.5834(15) angstrom, b = 8.3103(13) angstrom, c = 5.8277(8) angstrom, V = 512.55(13) angstrom(3), and Z = 2 for Sr3Li6Nb2O11 and a = 10.5936(6) angstrom, b = 8.3452(5) angstrom, c = 5.8271(4) angstrom, V = 515.15(6) angstrom(3), and Z = 2 for Sr3Li6Ta2O11. The crystal structure consists of sheets of interconnected SrO8 polyhedra that are separated by M-O layers and an intervening LiOx polyhedral framework, representing a new structural type. The M-O layers exhibit a rare occurrence of both five- and six-coordinated M6+ ions in the same structure. The oxides, upon excitation at 250 nm, exhibit violet emission at room temperature.
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