Investigations of tin(II/IV)phosphates prepared by various methods,Mossbauer study and X-ray diffraction characterization

摘要

Using various methods different tin phosphate samples were prepared.One of them was amorphous,while the others were crystalline with monoclinic structure,having unit cell parameters as follows:a = 4.586 A,b = 13.618 A,c = 5.818A,beta = 99.61° [Sn(H2PO4)2] and a = 8.612A,b = 4.964 A,c = 15.860 A,beta - 98.87° [Sn(HPO4)2],respectively.The crystal water content and the method of thermal decomposition of the samples were determined.The chemical composition of the end products of preparations was determined by promt-gamma activation analysis and was found to be Sn:P =1:2 for all samples independent of their preparation method.The oxidation state of tin atoms in samples as determined by Mossbauer spectroscopy was mainly +2 in sample no.2,while in some other samples it was +4.