Structural characterization and photoluminescence behavior of pure and doped potassium strontium niobates ceramics with tetragonal tungsten–bronze structure
Source abstract
Abstract
Abstract KSr 2 Nb 5 O 15 and K 1.2 Sr 1.6 Ln 0.2 Nb 5 O 15 ( Ln =La, Pr, and Nd) were synthesized by the Pechini method and calcined at 1373 K for 10 h under air atmosphere. Rietveld refinements indicated the presence of structural defects in both KSN and KSN- Ln , especially distortions in O–Nb–O and Nb–O–Nb bonds. Modifications in bond distances of [NbO 6 ] clusters were also confirmed by Raman spectroscopy. Ultraviolet-visible absorption spectra and photoluminescence profiles were influenced by lanthanide atoms in the band structure of modified KSN materials, creating new defects and intermediary energy levels within the band gap.
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Research context
OpenAlex topics: Ferroelectric and Piezoelectric Materials · Microwave Dielectric Ceramics Synthesis · Luminescence Properties of Advanced Materials
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