Structures and dissolution behaviors of MgO-CaO-P2O5-Nb2O5 glasses

Sungho Lee, Hirotaka Maeda, Akiko Obata, Kyosuke Ueda, Takayuki Narushima, Toshihiro Kasuga

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

MgO-CaO-P2O5-Nb2O5 glasses with the substitution of MgO for CaO consisting predominantly of meta-, pyro-, and orthophosphate groups were prepared using a melt-quenching method, and their structures and dissolution behaviors were investigated. Magnesium in the metaphosphate compositions was shown to act as a modifier oxide and coordinate phosphate groups. Magnesium in the pyro- and/or orthophosphate compositions was shown to act as a network former and to form P-O-Mg bonds, which crosslink short phosphate groups. The chemical durability of the metaphosphate glasses increased with increasing the substitution of MgO for CaO because magnesium exhibits a larger field strength than calcium. However, the durability of the pyro- and/or orthophosphate glasses decreased with increasing the MgO content: P-O-Mg bonds weakened the glass network structure and induced hydrolysis.

Original languageEnglish
Pages (from-to)18-25
Number of pages8
JournalJournal of Non-Crystalline Solids
Volume438
DOIs
Publication statusPublished - 2016 Apr 15

Keywords

  • Biomaterial
  • Calcium
  • Dissolution
  • Magnesium
  • Phosphate invert glass
  • Structure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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