Dissolution-precipitation synthesis and thermal stability of magnesium whitlockite

Agne Kizalaite, Vytautas Klimavicius, Vytautas Balevicius, Gediminas Niaura, Andrei N. Salak, Jen Chang Yang, Sung Hun Cho, Tomoyo Goto, Tohru Sekino, Aleksej Zarkov

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)4370-4379
Number of pages10
JournalCrystEngComm
Volume25
Issue number30
DOIs
Publication statusPublished - Jul 10 2023

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics

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