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Hydroxylherderite (Ca 2 Be 2 P 2 O 8 (OH) 2 ) stability under extreme conditions (up to 750°C/100 GPa)

2022; Wiley; Volume: 106; Issue: 4 Linguagem: Inglês

10.1111/jace.18923

1551-2916

Liudmila A. Gorelova, Oleg S. Vereshchagin, Andrey Aslandukov, Alena Aslandukovа, Dar’ya V. Spiridonova, Maria G. Krzhizhanovskaya, Anatoly V. Kasatkin, Leonid Dubrovinsky,

Nuclear materials and radiation effects

Abstract Hydroxylherderite, Ca 2 Be 2 P 2 O 8 (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 Ca 5 (PO 4 ) 3 F and hurlbutite CaBe 2 P 2 O 8 . The beryllophosphate member of the gadolinite supergroup is the most stable mineral (material) under high‐pressure conditions, compared to aluminum‐, boro‐ and beryllosilicates.