Title Dissolution–precipitation synthesis and thermal stability of magnesium whitlockite /
Authors Kizalaitė, Agnė ; Klimavičius, Vytautas ; Balevičius, Vytautas ; Niaura, Gediminas ; Salak, Andrei N ; Yang, Jen-Chang ; Cho, Sung Hun ; Goto, Tomoyo ; Sekino, Tohru ; Žarkov, Aleksej
DOI 10.1039/D3CE00602F
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Is Part of CrystEngComm.. Cambridge : The Royal Society of Chemistry. 2023, vol. 25, iss. 30, p. 4370-4379.. eISSN 1466-8033
Keywords [eng] magnesium whitlockite ; Ca18Mg2(HPO4)2(PO4)12 ; dissolution-precipitation ; phase transformation.
Abstract [eng] Magnesium whitlockite (Mg-WH, Ca18Mg2(HPO4)2(PO4)12) is a promising candidate for biomedical application in bone regeneration; however, the fabrication of Mg-WH bioceramics by conventional methods is limited. Mg-WH is known to be thermally unstable and decomposes upon heating. The mechanism of thermal decomposition and phase evolution has not comprehensively been investigated so far. In the present work, Mg-WH was synthesized by a dissolution–precipitation process under hydrothermal conditions. Thermally induced degradation of the synthesized powders was investigated in detail by combining X-ray diffraction (XRD) analysis, infrared spectroscopy (FTIR), Raman spectroscopy as well as 1H and 31P solid-state nuclear magnetic resonance (NMR). The as-prepared Mg-WH powders were annealed at different temperatures in the range from 400 to 1300 °C. It was found that thermal decomposition starts at around 700 °C with the formation of beta-tricalcium phosphate (β-TCP, Ca3(PO4)2) and a mixture of two Ca2P2O7 polymorphs. Thermal decomposition occurs gradually and the co-existence of both Mg-WH and Mg-substituted β-TCP phases was observed in a wide temperature range up to 1200 °C. Complete disappearance of the HPO42− structural unit was confirmed only after annealing at 1300 °C followed by melting at 1400 °C.
Published Cambridge : The Royal Society of Chemistry
Type Journal article
Language English
Publication date 2023
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