Temperature-induced transformation of metavariscite to berlinite



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Prado Herrero, P. and García Guinea, J. and Crespo Feo, Elena and Correcher, V. (2010) Temperature-induced transformation of metavariscite to berlinite. Phase Transitions, 83 (6). pp. 440-449. ISSN 1029-0338

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Official URL: http://dx.doi.org/10.1080/01411594.2010.490904


The 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.

Item Type:Article
Uncontrolled Keywords:berlinite; DTA-TG; HTXRD; Raman; thermoluminescence; variscite
Subjects:Sciences > Geology > Mineralogy
Sciences > Geology > Petrology
ID Code:76293
Deposited On:18 Jan 2023 06:46
Last Modified:18 Jan 2023 16:24

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