Cobalt selenate pentahydrate: Thermal decomposition intermediates and their properties dependence on temperature changes

• Autor(a) principal: de Godoi Machado, Rafael [UNESP]
• Data de Publicação: 2020
• Outros Autores: Gaglieri, Caroline [UNESP], Alarcon, Rafael Turra [UNESP], de Moura, Aniele [UNESP], de Almeida, Amanda Cosmo [UNESP], Caires, Flávio Junior [UNESP], Ionashiro, Massao [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.tca.2020.178615; http://hdl.handle.net/11449/201710
• topic: Color dependence; Dehydration process; Selenate materials; Temperature effect

Several new materials based on selenates and selenites have been produced, characterized and their application have exhibited good results in several areas. As consequence, some selenates/selenites that had been synthetized in the past have been better characterized aiming to provide more information about their properties to be applied. Thus, this work aims to provide a deep investigation about cobalt selenate pentahydrate focusing in its thermal behavior and in the properties of its thermal intermediates. To achieve this goal were used Simultaneous Thermogravimetry-Differential Thermal Analysis and Differential Scanning Calorimetry were used to determine the thermal properties; Furthermore, X-ray Powder Diffraction helped to confirm the crystallographic phase of each one and the morphological properties were studied using Scanning Electronic Microscopy. Lastly, the Ultra Violet-Visible/Near infrared spectroscopy together with the microscopy-Differential Scanning Calorimetry results elucidated the effect of the electronical changes on observed color. All these changes were related to the temperature.