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  • 1 Universidade Federal da Paraíba Laboratório de Termoquímica e Materiais, Departamento de Química, CCEN João Pessoa Brazil 58059-900 PB Campus I João Pessoa Brazil 58059-900 PB Campus I
  • | 2 Universidade Federal de Pernambuco Departamento de Química Fundamental/Central Analítica Recife Brazil 50740-540 PE Recife Brazil 50740-540 PE
  • | 3 Universidade Federal do Rio Grande do Norte Departamento de Engenharia Mecânica Natal Brazil 59072-970 RN Campus Universitário Natal Brazil 59072-970 RN Campus Universitário
  • | 4 Universidade Federal da Paraíba Laboratório de Materiais e Estruturas, Departamento de Engenharia Civil, CT João Pessoa Brazil 58059-900 PB Campus I João Pessoa Brazil 58059-900 PB Campus I
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Abstract  

Gypsum is a dihydrated calcium sulfate, with the composition of CaSO4⋅2H2O, with large application interest in ceramic industry, odontology, sulfuric acid production, cement, paints, etc. During calcination, a phase transformation is observed associated to the loss of water, leading to the formation of gypsum or anhydrite, which may present different phases. The identification of the phases is not so easy since their infrared spectra and their X-ray diffraction patterns are quite similar. Thus, in this work, temperature modulated differential scanning calorimetry (TMDSC) was used to identify the different gypsum phases, which can be recognized by their different profiles.

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