Structural refinement and optical band gap studies of manganese-doped modified sodium potassium lithium niobate lead — piezoelectric ceramics

• DOI: 10.1142/s0217979214501100
• Publication Date: 2014-05-30T08:08:06Z
• Authors: S. K. Mishra; R. K. Mishra; Kumar Brajesh; Rajyavardhan Ray; A. K. Himanshu; H. K. Pandey; N. K. Singh
• Keywords: Rietveld Refinement; Tetragonal crystal system; Natural bond orbital

Structural and Optical properties of the (Na0.5 K0.5)y Li 1-y NbO3 (y = 0.934 & 0.936) ceramics have been explored in terms X-Ray diffraction patters, Rietveld analysis, UV-Vis spectroscopy, Kubelka-Munk functions. analysis both these structures reveals them to be tetragonal with space group P4mm. It is found that increase doping increases optical band gap. Presence additional hardening dopant MnO2 a uniform behavior for composition. With increasing concentration, gap decreases indicative B-site cation O-p orbitals. Different valences Mn ions relative difference ionic radii Nb ion are most likely reason properties.