Centro de Tecnologia
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Article Avaliação da potencialidade de argilas do Rio Grande do Norte, Brasil. Parte-II: propriedades tecnológicas(Cerâmica Industrial, 2008) Dutra, Ricardo Peixoto Suassuna; Silva, Jaquelígia Brito da; Varela, Marcio Luiz; Nascimento, Rubens Maribondo do; Gomes, Uílame Umbelino; Paskocimas, Carlos AlbertoArticle Development of porous alumina membranes for treatment of textile effluent(Taylor & Francis, 2015-02-27) Silva, Késia Karina de Oliveira Souto; Paskocimas, Carlos Alberto; Oliveira, Fernando R.; Nascimento, José Heriberto Oliveira do; Zille, AndreaArticle Síntese e caracterização de ferrita de níquel e níquel-zinco pelo método de polimerização de complexos(69° Congresso Anual da ABM - Internacional, 2014) Nascimento, Rubens Maribondo do; Assis, Raimison Bezerra de; Valcacer, Samara Melo; Silva, Camila Cruz da; Silva, Ariadne de Souza; Delmonte, Maurício Roberto Bomio; Paskocimas, Carlos Alberto; Gomes, Uílame Umbelino; Motta, Fabiana Villela daNickel-zinc ferrites are ferrimagnetic ceramic materials with cubic spinel type crystal structure, space group Fd3m belonging to being a solid solution composition of NiO, ZnO and Fe2O3. The complex polymerization method has enormous potential for obtaining magnetic ceramics, because it is a simple process, that originates from materials with high purity, which leads to obtaining powders with high chemical homogeneity and high surface area. This work aims to evaluate the structural and morphological characteristics of ferrites Ni0,25Zn0,75Fe2O4 and NiFe2O4 obtained by polymerization complex method. The solution was subjected to a final temperature of 120°C until the formation of the resin pyrolysed at a temperature of 350°C for 2 hours and calcined at 500°C for 2 hours. The resulting powders were characterized by X-ray diffraction (XRD), thermal analysis (TG/ DSC) and scanning electron microscopy (SEM). The results of XRD showed the formation of two compositions majority of ferrite phase. The results of SEM micrographs showed the formation of agglomerated particles with longitudinal plates to both compositions being important microstructural characteristics for magnetic application. The method of polymerization of complexes appeared as a promising method to obtain ceramic powders of nickel ferrite and nickel-zinc alloy for magnetic application.Article Comparação do desempenho da adição de carbonatos calcítico e dolomítico em massa cerâmica de revestimento queimada em forno industrial(Cubo, 2016) Nascimento, Rubens Maribondo do; Soares, R. A. L.; Castro, R. J. S.; Paskocimas, Carlos AlbertoArticle Photoluminescence properties of (Eu, Tb, Tm) co-doped PbMoO4 obtained by sonochemical synthesis(Elsevier, 2017-04-05) Gurgel, G. M.; Lovisa, Laura Ximena; Pereira, Laurenice Martins; Motta, Fabiana Villela da; Li, Maximo Siu; Silva, Elson Longo da; Paskocimas, Carlos Alberto; Delmonte, Maurício Roberto BomioArticle Structure, morphology and photoluminescence emissions of ZnMoO4: RE 3+=Tb3+ -Tm3+ - x Eu3+ (x = 1, 1.5, 2, 2.5 and 3 mol%) particles obtained by the sonochemical method(Elsevier, 2018-06-25) Lovisa, Laura Ximena; Oliveira, Marisa Carvalho de; Andrés, Juan; Gracia, Lourdes; Li, Maximo Siu; Silva, Elson Longo da; Tranquilin, Ricardo Luis; Paskocimas, Carlos Alberto; Delmonte, Maurício Roberto Bomio; Motta, Fabiana Villela daArticle Ceramic crucibles: a new alternative for melting of PbO–BiO1.5–GaO1.5 glasses(Elsevier, 2002-07-10) Santos, Ieda Maria Garcia dos; Moreira, Rafael Carlos Martins; Souza, Antônio Gouveia de; Lebullenger, Ronan; Hernandes, Antônio Carlos; Leite, Edson Roberto; Paskocimas, Carlos Alberto; Silva, Elson Longo daArticle The origin of photoluminescence in amorphous lead titanate(Springer, 2003-03) Leite, Edson Roberto; Paris, Elaine Cristina; Pontes, F. M.; Paskocimas, Carlos Alberto; Silva, Elson Longo da; Sensato, F.; Pinheiro, Carlos Davidson; Varela, José A.; Pizani, Paulo Sérgio; Campos, C. E. M.; Lanciotti Júnior, FranchescoArticle Desenvolvimento do pigmento condutor SnO2-Sb2O3 e sua aplicação em vidrados semicondutores(ABCERAM, 2004-04) Aguiar, R.; Paskocimas, Carlos Alberto; Leite, Edson Roberto; Silva, Elson Longo da; Delmonte, Maurício Roberto BomioSemiconductor glazes are employed on electrical insulators to avoid surface discharge under conditions of intense electric fields, providing better performance in polluted environments. Semiconductor enamels are of great interest for electrical insulator coatings to avoid surface discharges, related to large potential differences. This enhances the performance of the insulator under polluted environments. Glazes used in ceramic industries are not conductive. The addition of conductive oxides to the glaze composition results in a semiconductor enamel. Sb2O3-doped SnO2 was mixed with the enamel in different concentrations. The resulting enamel was applied over green porcelain and fired at 1250 0C. Scanning electron microscopy characterization was performed and it was verified that the pigment concentration on the surface is low and does not affect the electrical conductivity. The pigment concentration on the fracture surface is approximately 35%. The insulator surface presents a high quality visual aspect and low surface roughness. The electrical resistivity is approximately 104 Ohm.m and occurs through the bulk of the glazeArticle An investigation of metal oxides which are photoluminiscent at room temperature(Elsevier, 2004-01) Leite, Edson Roberto; Pontes, Fenelon M.; Lee, Eduardo J. H.; Aguiar, Rosiana; Silva, Elson Longo da; Pontes, D. S. L.; Nunes, M. S. J.; Pizani, Paulo Sérgio; Lanciotti Júnior, Franchesco; Boschi, Tania M.; Varela, José A.; Paskocimas, Carlos Alberto; Pinheiro, Carlos Davidson; Taft, Carlton Anthony