Prado Herrero, P.García Guinea, J.Crespo Feo, María ElenaCorrecher, V.2023-06-202023-06-202010-061029-033810.1080/01411594.2010.490904https://hdl.handle.net/20.500.14352/43520The phase transition of metavariscite into berlinite has been studied by means of different techniques, namely electron probe micro analysis, environmental scanning electron microscopy, high-temperature X-ray diffraction, differential thermal analysis, thermogravimetry, thermoluminescence, and thermo Raman. The application of these techniques indicates that: (i) from room temperature to 150°C metavariscite (monoclinic dimorph AlPO 4·2H2O) appears as the main phase, (ii) in the range of 100-300°C metavariscite starts to lose the water molecules giving rise to form α-berlinite (trigonal AlPO4) that is the stable phase up to ca 540°C, and (iii) from 550°C onwards the structure adopts the more stable configuration, tetragonal β-berlinite.engjournal articlehttp://dx.doi.org/10.1080/01411594.2010.490904restricted access549.752/.757535.377berliniteDTA-TGHTXRDRamanthermoluminescencevarisciteMineralogía (Geología)Petrología2506.11 Mineralogía