The thermal analysis of some phosphate minerals: strengite, lipscombite, cyrilovite and goyazite
1988; Elsevier BV; Volume: 135; Linguagem: Inglês
10.1016/0040-6031(88)87395-7
ISSN1872-762X
AutoresY. Nathan, G. Panczer, Shana Gross,
Tópico(s)Crystal Structures and Properties
ResumoFour phosphate minerals: strengite, lipscombite, cyrilovite and goyazite were studied by thermal analysis (DTA,TG), X-rays (XRD), electron microscopy (SEM) and Infrared absorption. The three hydrous iron phosphates studied behave similarly to hydrous aluminous phosphates. They give endothermic reactions at low and medium temperatures related to the loss of water of crystallization and hydroxyls respectively. This causes a strong decrease in crystallinity. Recrystallization at high temperatures (650 – 800°C) with the formation of FeP04 (α -quartz structure and other polymorphs) appears to be common for hydrous Iron phosphates.
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