Resumo Nos dias atuais, a concorrência comercial estimulada pelas grandes empresas multinacionais tem direcionado o rumo das pesquisas cientificas para o aperfeiçoamento ou busca de materiais que ofereçam atrativas propriedades físicas ou químicas. O objetivo desse trabalho é analisar a influência dos métodos de síntese nas características estruturais do pó de titanato de bismuto. Foram sintetizadas amostras de titanato de bismuto pelos métodos Pechini e reação de combustão. As amostras sintetizadas foram submetidas as análises de difração de raios x, microscopia eletrônica de varredura, área superficial pelo método BET, tamanho de partícula por espalhamento dinâmico de luz, análise térmica pelas técnicas TGA, DTA e DSC. Todos os pós estudados apresentaram morfologia semelhante. As perdas de massas ocorreram em maior escala para as amostras produzidas pelo método de reação de combustão. A fase de titanato de bismuto formou-se em ambos os métodos, entretanto a fase teórica (estequiometria 1:1:3) desejada não foi formada. Palavras-chave: Titanato de bismuto; método Pechini; Reação de combustão. INFLUENCE OF THE SYNTHESIS METHOD ON STRUCTURAL CHARACTERISTICS OF BISMUTAN TITANATE Abstract Nowadays, the commercial competition stimulated by the big multinational companies has directed the direction of the scientific researches for the improvement or search of materials that offer attractive physical or chemical properties. The objective of this work is to analyze the influence of the synthesis methods on the structural characteristics of bismuth titanate powder. Samples of bismuth titanate were synthesized by Pechini methods and combustion reaction. The samples were analyzed by X-ray diffraction, scanning electron microscopy, surface area by BET method, particle size by dynamic light scattering, and thermal analysis by TGA, DTA and DSC techniques. All the studied powders presented similar morphology. Mass losses occurred on a larger scale for the samples produced by the combustion reaction method. The bismuth titanate phase was formed in both methods, however the desired theoretical phase (stoichiometry 1: 1: 3) was not formed.
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