Síntese e caracterização de cristais de X2Y(SO4)2.6H2O (X=NH4, Cs; Y=Ni, Mn, Mg) dopados com Neodímio, Prata, Boro e Dimetilurea

Abstract

An important class of crystals that has attracted the interest of many researchers are the Tutton salt family crystals. Especially, the properties of mixed crystals are relatively understudied. The crystals of this family have chemical formula of the type where X + is a monovalent ion, Y 2+ is a bivalent ion and Z can be (S or Se) and are applied in the production of special windows for UV/IR radiation in aircraft missile approach detection systems. Through the method of crystal growth by solution, it is possible to obtain pure and mixed crystals, with the combination of these elements, it is possible to obtain crystals with a wide range of compositions and distinct properties. Furthermore, dopants can be added to the crystal structure of these salts. In the present work, were investigated the spectroscopic properties of crystals with composition (NH4)2NixMn(1-x)(SO4)2.6H2O, doped with Neodymium, (NH4)2Ni(SO4)2.6H2O with Boron and Silver, (NH4)2Mg(SO4)2.6H2O with Silver and (Cs)2Ni(SO4)2.6H2O with Dimethylurea, through Raman spectroscopic techniques, Fourier transform infrared (FT-IR) and thermogravimetric analysis TG/DTA coupled with FT-IR, where it was possible to verify a significant gain in the initial dehydration temperature of the doped crystals when compared to the pure crystals.