Hydroxylherderite (Ca₂Be₂P₂O₈(OH)₂) stability under extreme conditions (up to 750°C/100 GPa)

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Gorelova, Liudmila ; Vereshchagin, Oleg ; Aslandukov, Andrii ; Aslandukova, Alena ; Spiridonova, Dar'ya ; Krzhizhanovskaya, Maria ; Kasatkin, Anatoly ; Dubrovinsky, Leonid:
Hydroxylherderite (Ca₂Be₂P₂O₈(OH)₂) stability under extreme conditions (up to 750°C/100 GPa).
In: Journal of the American Ceramic Society. Bd. 106 (2023) Heft 4 . - S. 2622-2634.
ISSN 1551-2916
DOI: https://doi.org/10.1111/jace.18923

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Abstract

Hydroxylherderite, Ca2Be2P2O8(OH)2, is among the most common beryllophosphates in nature and could play a substantial role in Be geochemical cycle. Hydroxylherderite P–T stability and crystal structure behavior were studied under extreme conditions (up to 750°C/100 GPa) using in situ single-crystal and powder X-ray diffraction and Raman spectroscopy. The mineral demonstrated high stability under high-pressure conditions (up to ∼100 GPa) without any phase transitions. Under high-temperature conditions, it was stable up to about 700°C, when it decomposed with the formation of fluorapatite Ca5(PO4)3F and hurlbutite CaBe2P2O8. The beryllophosphate member of the gadolinite supergroup is the most stable mineral (material) under high-pressure conditions, compared to aluminum-, boro- and beryllosilicates.