Preparation of orthophosphate glasses in the MgO-CaO-SiO2-Nb2O5-P2O5 system

Sungho Lee, Kyosuke Ueda, Takayuki Narushima, Takayoshi Nakano, Toshihiro Kasuga

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

BACKGROUND: Niobia/magnesia-containing orthophosphate invert glasses were successfully prepared in our earlier work. Orthophosphate groups in the glasses were cross-linked by tetrahedral niobia (NbO4) and magnesia. OBJECTIVE: The aim of this work is to prepare calcium orthophosphate invert glasses containing magnesia and niobia, incorporating silica, and to evaluate their structures and releasing behaviors. METHOD: The glasses were prepared by melt-quenching, and their structures and ion-releasing behaviors were evaluated. RESULTS: 31P solid-state nuclear magnetic resonance (NMR) and Raman spectroscopies showed the glasses consist of orthophosphate (PO4), orthosilicate (SiO4), and NbO4 tetrahedra. NbO4 and MgO in the glasses act as network formers. By incorporating SiO2 into the glasses, the chemical durability of the glasses was slightly improved. The glasses reheated at 800°C formed the orthophosphate crystalline phases, such as β-Ca3 (PO4) 2, Mg3 (PO4) 2 and Mg3Ca3 (PO4)3 in the glasses. The chemical durability of the crystallized glasses was slightly improved. CONCLUSIONS: Orthosilicate groups and NbO4 in the glasses coordinated with each other to form Si-O-Nb bonds. The chemical durability of the glasses was slightly improved by addition of SiO2, since the field strength of Si is larger than that of Ca or Mg.

Original languageEnglish
Pages (from-to)23-30
Number of pages8
JournalBio-medical materials and engineering
Volume28
Issue number1
DOIs
Publication statusPublished - 2017

Keywords

  • Biomaterials
  • Magnesium
  • Orthophosphate
  • Phosphate invert glass
  • Silicate, niobium

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering

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