Synthesis and characterization of bismuth containing novel type oxyphosphates

The thesis is about the synthesis of new bismuth-alkali oxy-phosphates which type of M2BiOPO4 ( M= Na, Li ). The obtained compounds have been characterized by X-Ray powder diffraction (XRD), Infrared spectroscopy (IR), and Scanning Electron Microscopy (SEM/EDX). And in the results of calculations (refinement) by Jana2006 and Match!3 Softwares, for the Bi2O3 (s) + Na4P2O7 (s) → 2Na2BiOPO4(s) solid-state reaction the unit cell parameters of synthesized compound are a =15.4658, b =10.8601, c =12.6592 A°, the space group is detected as Pmm2 and it crystallizes in orthorhombic system. Another work of thesis is synthesized Na2BiOPO4 compounds from Bi2O3(s) + 2Na2HPO4(s) → 2Na2BiOPO4(s) + H2O(g) Bi2O3(s)+2NH4H2PO4(s)+2Na2CO3(s) → 2Na2BiOPO4(s)+2NH3(g)+2CO2(g)+3H2O(g) solid-state reactions. When the examination of obtained products in XRD and FTIR data, Na2BiOPO4 was found to be orthorhombic. According to Rietveld calculation results by using Jana2006 and Match!3 softwares the unit cell parameters are calculated as a = 15.932, b = 10.913, c = 13.128 Å and a = 15.324, b = 10.746, c = 13.011 Å respectively and space groups of compounds determined as Pmm2 . Also finally, the lithium-bismuth oxyphosphate compound was synthesized from the following solid-state reactions. Bi2O3(s) + Li4P2O7(s) → 2Li2BiOPO4(s) Bi2O3(s) + 2LiH2PO4(s) + Li2CO3(s) → 2Li2BiOPO4(s) + CO2(g) + 2H2O(g) The obtained compounds were found to be monoclinic structure and found to be isomorphous with Li2Bi14.67(PO4)6O14 compound. And the unit cell parameters were calculated as a = 10.738, b = 12.2486, c = 10.4148 Å, β°=93.088, a= 24.0345, b= 4.3912, c= 11.3362, β= 101.802 respectively and the space group determined as P21.