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Synthesis, structure and magnetic behaviour of mixed metal leucophosphite
Shi, Fa-Nian; Santos, António Moreira dos; Cunha-Silva, Luís; Costa, Benilde F.O.; Klinowski, Jacek; Paz, Filipe A. Almeida; Amaral, Vítor S.A synthetic analogue of leucophosphite, an iron phosphate, was synthesized hydrothermally at 180 °C and its chemical composition determined to be K[(FeV)(PO4)2(OH)(H2O)]·H2O. The compound crystallizes in the monoclinic P21/c space group, with a=9.7210(19) Å, b=9.6500(19) Å, c=12.198(4) Å and [beta]=128.569(18)°. While the original all-iron compound is reported to be antiferromagnetic, the inclusion of substitut...
O emprego da termogravimetria para determinar a energia de ativação do processo...
Leiva,Cecilia Rocío Morales; Crnkovic,Paula Manoel; Santos,Antonio Moreira dosActivation energy (Ea) is a parameter that can be applied to make predictions about the quality of oils to be used in an ICO engine. In this study, Ea was determined by thermogravimetry following two different procedures: ASTM E 1641 and Model-free kinetics. The energies were calculated in the low temperature oxidation (LTO) region for three Brazilian fuel oils (denominated A, B and C) and the results were equa...
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