Hydrothermal synthesis and crystal structure of new red phosphors, KNaMF7:Mn4+ (M: Nb, Ta)
Source abstract
Abstract
Abstract Single crystals of new alkali niobium and tantalum fluorides, KNaMF7 (M: Nb, Ta), were prepared by hydrothermal reactions using a perovskite-type oxides, KMO3 as one of the starting compounds. Their crystal structures were determined from single crystal X-ray diffraction data. These fluorides crystallized in the orthorhombic space group P212121 (#19) with a = 5.509(2), b = 9.100(4), and c = 11.234(5) A for KNaNbF7 and a = 5.517(2), b = 9.093(3), and c = 11.273(4) A for KNaTaF7. The crystal structures contained isolated MF7 polyhedra showing a monocapped trigonal prism geometry and the M5+ sites could be replaced partially by Mn4+ ions during the hydrothermal reaction. These Mn4+ ion-doped fluorides exhibited photoluminescence properties similar to those of red phosphors. The local environment of Mn4+ ions in these fluorides was confirmed by the X-ray absorption fine structure (XAFS) analysis.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Inorganic Fluorides and Related Compounds · Luminescence Properties of Advanced Materials · Microwave Dielectric Ceramics Synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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