The effect of MgO/TiO2 on structural and crystallization behavior of near invert phosphate-based glasses

MT Islam, N Sharmin, GA Rance, JJ Titman, AJ Parsons, Kazi M. Zakir Hossain, I Ahmed

Research output: Contribution to journalArticle

1 Citation (Scopus)
4 Downloads (Pure)

Abstract

Varying formulations in the glass system of 40P2 O5 ─(24 - x)MgO─(16 + x)CaO─(20 - y)Na2 O─yTiO2 (where 0 ≤ x ≤ 22 and y = 0 or 1) were prepared via melt-quenching. The structure of the glasses was confirmed by X-ray diffraction (XRD), Fourier transform infrared (FTIR), micro Raman and solid-state nuclear magnetic resonance (NMR) spectroscopies. The thermal properties and the activation energy of crystallization (Ec ) were measured using thermal analysis and the Kissinger equation, respectively. The glass forming ability of the formulations investigated was seen to decrease with reducing MgO content down to 8 mol% and the glass stability region also decreased from 106 to 90°C with decreasing MgO content. The activation energy of crystallization (Ec ) values also decreased from 248 (for 24 mol% MgO glass) to 229 kJ/mol (for the 8 mol% MgO content) with the replacement of MgO by CaO for glasses with no TiO2 . The formulations containing less than 8 mol% MgO without TiO2 showed a strong tendency toward crystallization. However, the addition of 1 mol% TiO2 in place of Na2 O for these glasses with less than 8 mol% MgO content, inhibited their crystallization tendency. Glasses containing 8 mol% MgO with 1 mol% TiO2 revealed a 12°C higher glass transition temperature, a 14°C increase in glass stability against crystallization and a 38 kJ/mol increase in Ec in comparison to their non TiO2 containing counterpart. NMR spectroscopy revealed that all of the formulations contained almost equal percentages of Q1 and Q2 species. However, FTIR and Raman spectroscopies showed that the local structure of the glasses had been altered with addition of 1 mol% TiO2 , which acted as a network modifier, impeding crystallization by increasing the cross-linking between phosphate chains and consequently leading to increased Ec as well as their glass forming ability.
Original languageEnglish
JournalJournal of Biomedical Materials Research Part B-Applied Biomaterials
Early online date7 Jun 2019
DOIs
Publication statusE-pub ahead of print - 7 Jun 2019

Keywords

  • activation energy
  • biomaterials
  • crystallization
  • phosphate glass

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering

Cite this

The effect of MgO/TiO2 on structural and crystallization behavior of near invert phosphate-based glasses. / Islam, MT; Sharmin, N; Rance, GA; Titman, JJ; Parsons, AJ; Hossain, Kazi M. Zakir; Ahmed, I.

In: Journal of Biomedical Materials Research Part B-Applied Biomaterials, 07.06.2019.

Research output: Contribution to journalArticle

@article{a442e76818f94a0e8cd7e3a892d492fa,
title = "The effect of MgO/TiO2 on structural and crystallization behavior of near invert phosphate-based glasses",
abstract = "Varying formulations in the glass system of 40P2 O5 ─(24 - x)MgO─(16 + x)CaO─(20 - y)Na2 O─yTiO2 (where 0 ≤ x ≤ 22 and y = 0 or 1) were prepared via melt-quenching. The structure of the glasses was confirmed by X-ray diffraction (XRD), Fourier transform infrared (FTIR), micro Raman and solid-state nuclear magnetic resonance (NMR) spectroscopies. The thermal properties and the activation energy of crystallization (Ec ) were measured using thermal analysis and the Kissinger equation, respectively. The glass forming ability of the formulations investigated was seen to decrease with reducing MgO content down to 8 mol{\%} and the glass stability region also decreased from 106 to 90°C with decreasing MgO content. The activation energy of crystallization (Ec ) values also decreased from 248 (for 24 mol{\%} MgO glass) to 229 kJ/mol (for the 8 mol{\%} MgO content) with the replacement of MgO by CaO for glasses with no TiO2 . The formulations containing less than 8 mol{\%} MgO without TiO2 showed a strong tendency toward crystallization. However, the addition of 1 mol{\%} TiO2 in place of Na2 O for these glasses with less than 8 mol{\%} MgO content, inhibited their crystallization tendency. Glasses containing 8 mol{\%} MgO with 1 mol{\%} TiO2 revealed a 12°C higher glass transition temperature, a 14°C increase in glass stability against crystallization and a 38 kJ/mol increase in Ec in comparison to their non TiO2 containing counterpart. NMR spectroscopy revealed that all of the formulations contained almost equal percentages of Q1 and Q2 species. However, FTIR and Raman spectroscopies showed that the local structure of the glasses had been altered with addition of 1 mol{\%} TiO2 , which acted as a network modifier, impeding crystallization by increasing the cross-linking between phosphate chains and consequently leading to increased Ec as well as their glass forming ability.",
keywords = "activation energy, biomaterials, crystallization, phosphate glass",
author = "MT Islam and N Sharmin and GA Rance and JJ Titman and AJ Parsons and Hossain, {Kazi M. Zakir} and I Ahmed",
year = "2019",
month = "6",
day = "7",
doi = "10.1002/jbm.b.34421",
language = "English",
journal = "Journal of Biomedical Materials Research Part B-Applied Biomaterials",
issn = "1552-4973",
publisher = "John Wiley and Sons Inc.",

}

TY - JOUR

T1 - The effect of MgO/TiO2 on structural and crystallization behavior of near invert phosphate-based glasses

AU - Islam, MT

AU - Sharmin, N

AU - Rance, GA

AU - Titman, JJ

AU - Parsons, AJ

AU - Hossain, Kazi M. Zakir

AU - Ahmed, I

PY - 2019/6/7

Y1 - 2019/6/7

N2 - Varying formulations in the glass system of 40P2 O5 ─(24 - x)MgO─(16 + x)CaO─(20 - y)Na2 O─yTiO2 (where 0 ≤ x ≤ 22 and y = 0 or 1) were prepared via melt-quenching. The structure of the glasses was confirmed by X-ray diffraction (XRD), Fourier transform infrared (FTIR), micro Raman and solid-state nuclear magnetic resonance (NMR) spectroscopies. The thermal properties and the activation energy of crystallization (Ec ) were measured using thermal analysis and the Kissinger equation, respectively. The glass forming ability of the formulations investigated was seen to decrease with reducing MgO content down to 8 mol% and the glass stability region also decreased from 106 to 90°C with decreasing MgO content. The activation energy of crystallization (Ec ) values also decreased from 248 (for 24 mol% MgO glass) to 229 kJ/mol (for the 8 mol% MgO content) with the replacement of MgO by CaO for glasses with no TiO2 . The formulations containing less than 8 mol% MgO without TiO2 showed a strong tendency toward crystallization. However, the addition of 1 mol% TiO2 in place of Na2 O for these glasses with less than 8 mol% MgO content, inhibited their crystallization tendency. Glasses containing 8 mol% MgO with 1 mol% TiO2 revealed a 12°C higher glass transition temperature, a 14°C increase in glass stability against crystallization and a 38 kJ/mol increase in Ec in comparison to their non TiO2 containing counterpart. NMR spectroscopy revealed that all of the formulations contained almost equal percentages of Q1 and Q2 species. However, FTIR and Raman spectroscopies showed that the local structure of the glasses had been altered with addition of 1 mol% TiO2 , which acted as a network modifier, impeding crystallization by increasing the cross-linking between phosphate chains and consequently leading to increased Ec as well as their glass forming ability.

AB - Varying formulations in the glass system of 40P2 O5 ─(24 - x)MgO─(16 + x)CaO─(20 - y)Na2 O─yTiO2 (where 0 ≤ x ≤ 22 and y = 0 or 1) were prepared via melt-quenching. The structure of the glasses was confirmed by X-ray diffraction (XRD), Fourier transform infrared (FTIR), micro Raman and solid-state nuclear magnetic resonance (NMR) spectroscopies. The thermal properties and the activation energy of crystallization (Ec ) were measured using thermal analysis and the Kissinger equation, respectively. The glass forming ability of the formulations investigated was seen to decrease with reducing MgO content down to 8 mol% and the glass stability region also decreased from 106 to 90°C with decreasing MgO content. The activation energy of crystallization (Ec ) values also decreased from 248 (for 24 mol% MgO glass) to 229 kJ/mol (for the 8 mol% MgO content) with the replacement of MgO by CaO for glasses with no TiO2 . The formulations containing less than 8 mol% MgO without TiO2 showed a strong tendency toward crystallization. However, the addition of 1 mol% TiO2 in place of Na2 O for these glasses with less than 8 mol% MgO content, inhibited their crystallization tendency. Glasses containing 8 mol% MgO with 1 mol% TiO2 revealed a 12°C higher glass transition temperature, a 14°C increase in glass stability against crystallization and a 38 kJ/mol increase in Ec in comparison to their non TiO2 containing counterpart. NMR spectroscopy revealed that all of the formulations contained almost equal percentages of Q1 and Q2 species. However, FTIR and Raman spectroscopies showed that the local structure of the glasses had been altered with addition of 1 mol% TiO2 , which acted as a network modifier, impeding crystallization by increasing the cross-linking between phosphate chains and consequently leading to increased Ec as well as their glass forming ability.

KW - activation energy

KW - biomaterials

KW - crystallization

KW - phosphate glass

UR - http://www.scopus.com/inward/record.url?scp=85067412592&partnerID=8YFLogxK

U2 - 10.1002/jbm.b.34421

DO - 10.1002/jbm.b.34421

M3 - Article

JO - Journal of Biomedical Materials Research Part B-Applied Biomaterials

JF - Journal of Biomedical Materials Research Part B-Applied Biomaterials

SN - 1552-4973

ER -