Effect of SiO2 on densification and microstructure development in Nd:YAG transparent ceramics

Adam J. Stevenson, Xin Li, Miguel A. Martinez, Julie M. Anderson, Daniel L. Suchy, Elizabeth Rader Kupp, Elizabeth C. Dickey, Karl Todd Mueller, Gary Lynn Messing

Research output: Contribution to journalArticle

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Abstract

This paper examines the influence of SiO2 doping on densification and microstructure evolution in Nd3xY 3-3xAl5O12 (Nd:YAG) ceramics. Nd:YAG powders were doped with 0.035-0.28 wt% SiO2 and vacuum sintered between 1484° and 1750°C. 29Si magic-angle spinning nuclear magnetic resonance showed that Si4+ substitutes onto tetrahedrally coordinated Al3+ sites. High-resolution transmission electron microscopy showed no grain boundary second phases for all silica levels in samples sintered at 1600°-1750°C. Coarsening was limited by a solute drag mechanism as suggested by cubic grain growth kinetics and transmission electron microscopy energy-dispersive X-ray spectroscopy observations of increased Nd3+ concentration near grain boundaries. Increasing SiO2 content increased both densification and grain growth rate and led to increasingly coarsening-dominated sintering trajectories. Fine-grained (<3 μm), highly transparent (>82% real in-line transmission) ceramics were produced by sintering 0.035 wt% SiO2-doped ceramics at 1750°C for 8 h. Coarse-grained (18 μm), transparent samples were obtained with 0.28 wt% SiO2-doped Nd:YAG when sintered at 1600°C for 8 h.

Original languageEnglish (US)
Pages (from-to)1380-1387
Number of pages8
JournalJournal of the American Ceramic Society
Volume94
Issue number5
DOIs
StatePublished - May 1 2011

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Coarsening
Grain growth
Densification
ceramics
microstructure
Grain boundaries
Sintering
grain boundary
Microstructure
Magic angle spinning
transmission electron microscopy
Growth kinetics
High resolution transmission electron microscopy
Silicon Dioxide
Powders
Drag
Electric lines
Silica
Doping (additives)
Trajectories

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Stevenson, Adam J. ; Li, Xin ; Martinez, Miguel A. ; Anderson, Julie M. ; Suchy, Daniel L. ; Kupp, Elizabeth Rader ; Dickey, Elizabeth C. ; Mueller, Karl Todd ; Messing, Gary Lynn. / Effect of SiO2 on densification and microstructure development in Nd:YAG transparent ceramics. In: Journal of the American Ceramic Society. 2011 ; Vol. 94, No. 5. pp. 1380-1387.
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Effect of SiO2 on densification and microstructure development in Nd:YAG transparent ceramics. / Stevenson, Adam J.; Li, Xin; Martinez, Miguel A.; Anderson, Julie M.; Suchy, Daniel L.; Kupp, Elizabeth Rader; Dickey, Elizabeth C.; Mueller, Karl Todd; Messing, Gary Lynn.

In: Journal of the American Ceramic Society, Vol. 94, No. 5, 01.05.2011, p. 1380-1387.

Research output: Contribution to journalArticle

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N2 - This paper examines the influence of SiO2 doping on densification and microstructure evolution in Nd3xY 3-3xAl5O12 (Nd:YAG) ceramics. Nd:YAG powders were doped with 0.035-0.28 wt% SiO2 and vacuum sintered between 1484° and 1750°C. 29Si magic-angle spinning nuclear magnetic resonance showed that Si4+ substitutes onto tetrahedrally coordinated Al3+ sites. High-resolution transmission electron microscopy showed no grain boundary second phases for all silica levels in samples sintered at 1600°-1750°C. Coarsening was limited by a solute drag mechanism as suggested by cubic grain growth kinetics and transmission electron microscopy energy-dispersive X-ray spectroscopy observations of increased Nd3+ concentration near grain boundaries. Increasing SiO2 content increased both densification and grain growth rate and led to increasingly coarsening-dominated sintering trajectories. Fine-grained (<3 μm), highly transparent (>82% real in-line transmission) ceramics were produced by sintering 0.035 wt% SiO2-doped ceramics at 1750°C for 8 h. Coarse-grained (18 μm), transparent samples were obtained with 0.28 wt% SiO2-doped Nd:YAG when sintered at 1600°C for 8 h.

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