2014-06-162014-06-162011FERREIRA JÚNIOR, Messias de Nazaré Guimarães. Crescimento e caracterização dos cristais de sulfato de níquel hexahidratado dopados com íons [MnH2O]2+ e com sulfato de magnésio heptahidratado. 2011. 49 f. Dissertação (Mestrado) - Universidade Federal do Pará, Instituto de Ciências Exatas e Naturais, Belém, 2011. Programa de Pós-Graduação em Física.https://repositorio.ufpa.br/handle/2011/5070In this work, manganese ions doped nickel sulphate crystals (NSH:Mn) and magnesium ion doped nickel sulphate crystals (NMgSH) were grown and later characterized by X-ray diffraction and Raman spectroscopy techniques. The results obtained showed that the doped crystals possess a structure very similar to that of the pure nickel sulphate crystal (NSH), with an anisotropic deformation in the unit cell dimensions compared to the pure crystal, undergoing expansion in unit. The aim of the present study was to grow two new single crystals of good optical quality to be used as optical bandpass filters. Nickel sulfate hexahydrate (NHS) crystals are known to possess an optical transmission spectrum which has attracted much attention because it presents two regions with high transmission efficiency of approximately 80%, the first region being between 200 and 350 nm and the second between 400 and 600 nm, and a high absorption efficiency in other regions of the UV-VIS spectrum. A light transmission spectrum with these characteristics is similar to an optical filter. Termogravimetric (TGA) analyses were carried out for pure and doped crystals. The obtained decomposition temperature of NSH was found to be 73 °C while that NSH: Mn and NMgSH crystals present values of 82 ° C and 86 C respectively. As can be easily perceived, the thermal stability of crystals with Mn or Mg ions in their structures is significantly higher. The transmission band between 200 and 350 nm in the optical spectrum of NSH was found to be narrower in the transmission spectrum of the doped crystal thus restricting the region of the spectrum known as UVA.porAcesso AbertoCristal (Física)Íon de manganêsDifração de raio XEspectroscopia RamanEspectroscopiaSulfato de níquelFiltro óticoCristais dopadosDissertaçãoCNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::FISICA DA MATERIA CONDENSADA::ESTRUTURA DE LIQUIDOS E SOLIDOS CRISTALOGRAFIA