Influence of Ethylene Glycol on the Mullite Crystallization Processes Analyzed by Rietveld Refinement oleh Flaviano Willians Fernandes, Tiago Moreira Bastos Campos, Luciana De Simone Cividanes, João Paulo Barros Machado, Evelyn Alves Nunes Simonetti, Gilmar Patrocinio Thim