Structure and dissolution behavior of MgO-P2O5-TiO2/Nb2O5 (Mg/P > 1) invert glasses

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

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Magnesium phosphate glasses exhibit unusual properties and were classified as 'anomalous phosphate glasses', because magnesium is attributed to a variation of the oxygen coordination number from 6 to 4. Magnesium in phosphate glasses acts as an intermediate oxide and its role was determined, relating to the phosphate chain length. In the present work, MgOP2O5TiO2/ Nb2O5 glasses with Mg/P ratio between 1.00 and 1.36 were successfully prepared by a meltquenching method. Magnesium in the glasses worked as a network former to form POMg bonds, which are cross-linked short phosphate chains that improved the glass-forming ability. Intermediate oxides (i.e., TiO2 and Nb2O5) in the glasses also cross-linked short phosphate chains to form POTi/ Nb bonds. The chemical durability of the glasses decreased with an increase in the Mg/P ratio, because magnesium, which entered the phosphate network, weakened the glass network to induce hydrolysis. The dissolution rate of Ti4+ and Nb5+ ions showed a decreasing tendency with an increase in the Mg/P ratio. The surfaces of the glasses were considered to be covered with gel-like oxide layers containing titanium or niobium and phosphate.

Original languageEnglish
Pages (from-to)942-948
Number of pages7
JournalJournal of the Ceramic Society of Japan
Volume123
Issue number1442
DOIs
Publication statusPublished - 2015

Keywords

  • Biomaterial
  • Invert glass
  • Magnesium
  • Niobium
  • Phosphate glass
  • Structure
  • Titanium

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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