| dc.description.abstract | Two indium germanates were synthesized by the flux-growth method and two indium silicates were synthesized by the high-temperature, high pressure hydrothermal method. Four compounds are classified into two series based on their synthetic method. The series A denotes indium germanates, [Rb3F2x]In3O2-xGe8O20 (A1) and NaInGe2O6 (A2), while the series B denotes indium silicates, Cs2SrIn2(OH)2Si4O12 (B1) and Cs2BaIn2(OH)2Si4O12 (B2). All structures are determined by single-crystal X-ray diffraction, and the details of these structures are discussed. The purity of each compound was confirmed by the powder X-ray diffraction analysis, and the properties of these compounds were further characterized by different physical measurements, such as element analysis, infrared spectra analysis, and luminescence spectra analysis.
A1 is a novel structure, which is the first inorganic indium germinate of 2-D layered structures. The structure contains parallel chains of edge-sharing InO6, which are linked by sharing vertices with two germanate single layers [Ge4O10]4- to form 2-D framework structure. Both Rb+ and F- are in the channels, and the Rb+ are located between the framework layers. A2 and KInGe2O6 are isostructural germanates. This research not only demonstrates the relationship between the optical mechanism and the structure of A1, but also infers the possible optical site.
B1 and B2 are isotructural silicates. The structure contains S-shape chains of corner-sharing InO6, which are in turn linked by sharing vertices with four-membered single ring silicate anions [Ge4O12]8- to form a 3-D framework structure. The difference between B1and B2 is alkaline-earth cation. This research demonstrates the relationship between the interaction of hydrogen bond and the structure.
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