Effects of Gd Substitution on Sintering and Optical Properties of Highly Transparent (Y0.95-xGdxEu0.05)2O3 Ceramics

Bin Lu, Ji Guang Li, Tohru Suzuki, Hidehiko Tanaka, Xudong Sun, Yoshio Sakka

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Highly transparent (Y0.95-xGdxEu0.05)2O3 (x = 0.15-0.55) ceramics have been fabricated by vacuum sintering at the relatively low temperature of 1700°C for 4 h with the in-line transmittances of 73.6%-79.5% at the Eu3+ emission wavelength of 613 nm (~91.9%-99.3% of the theoretical transmittance of Y1.34Gd0.6Eu0.06O3 single crystal), whereas the x = 0.65 ceramic undergoes a phase transformation at 1650°C and has a transparency of 53.4% at the lower sintering temperature of 1625°C. The effects of Gd3+ substitution for Y3+ on the particle characteristics, sintering kinetics, and optical performances of the materials were systematically studied. The results show that (1) calcining the layered rare-earth hydroxide precursors of the ternary Y-Gd-Eu system yielded rounded oxide particles with greatly reduced hard agglomeration and the particle/crystallite size slightly decreases along with increasing Gd3+ incorporation; (2) in the temperature range 1100°C-1480°C, the sintering kinetics of (Y0.95-xGdxEu0.05)2O3 is mainly controlled by grain-boundary diffusion with similar activation energies of ~230 kJ/mol; (3) Gd3+ addition promotes grain growth and densification in the temperature range 1100°C-1400°C; (4) the bandgap energies of the (Y0.95-xGdxEu0.05)2O3 ceramics generally decrease with increasing x; however, they are much lower than those of the oxide powders; (5) both the oxide powders and the transparent ceramics exhibit the typical red emission of Eu3+ at ~613 nm (the 5D07F2 transition) under charge transfer (CT) excitation. Gd3+ incorporation enhances the photoluminescence and shortens the fluorescence lifetime of Eu3+.

Original languageEnglish
Pages (from-to)2480-2487
Number of pages8
JournalJournal of the American Ceramic Society
Volume98
Issue number8
DOIs
Publication statusPublished - 2015 Aug 1
Externally publishedYes

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Substitution reactions
Sintering
Optical properties
Oxides
Powders
Temperature
Kinetics
Crystallite size
Grain growth
Densification
Transparency
Rare earths
Charge transfer
Photoluminescence
Grain boundaries
Energy gap
Agglomeration
Activation energy
Phase transitions
Fluorescence

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Effects of Gd Substitution on Sintering and Optical Properties of Highly Transparent (Y0.95-xGdxEu0.05)2O3 Ceramics. / Lu, Bin; Li, Ji Guang; Suzuki, Tohru; Tanaka, Hidehiko; Sun, Xudong; Sakka, Yoshio.

In: Journal of the American Ceramic Society, Vol. 98, No. 8, 01.08.2015, p. 2480-2487.

Research output: Contribution to journalArticle

Lu, Bin ; Li, Ji Guang ; Suzuki, Tohru ; Tanaka, Hidehiko ; Sun, Xudong ; Sakka, Yoshio. / Effects of Gd Substitution on Sintering and Optical Properties of Highly Transparent (Y0.95-xGdxEu0.05)2O3 Ceramics. In: Journal of the American Ceramic Society. 2015 ; Vol. 98, No. 8. pp. 2480-2487.
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abstract = "Highly transparent (Y0.95-xGdxEu0.05)2O3 (x = 0.15-0.55) ceramics have been fabricated by vacuum sintering at the relatively low temperature of 1700°C for 4 h with the in-line transmittances of 73.6{\%}-79.5{\%} at the Eu3+ emission wavelength of 613 nm (~91.9{\%}-99.3{\%} of the theoretical transmittance of Y1.34Gd0.6Eu0.06O3 single crystal), whereas the x = 0.65 ceramic undergoes a phase transformation at 1650°C and has a transparency of 53.4{\%} at the lower sintering temperature of 1625°C. The effects of Gd3+ substitution for Y3+ on the particle characteristics, sintering kinetics, and optical performances of the materials were systematically studied. The results show that (1) calcining the layered rare-earth hydroxide precursors of the ternary Y-Gd-Eu system yielded rounded oxide particles with greatly reduced hard agglomeration and the particle/crystallite size slightly decreases along with increasing Gd3+ incorporation; (2) in the temperature range 1100°C-1480°C, the sintering kinetics of (Y0.95-xGdxEu0.05)2O3 is mainly controlled by grain-boundary diffusion with similar activation energies of ~230 kJ/mol; (3) Gd3+ addition promotes grain growth and densification in the temperature range 1100°C-1400°C; (4) the bandgap energies of the (Y0.95-xGdxEu0.05)2O3 ceramics generally decrease with increasing x; however, they are much lower than those of the oxide powders; (5) both the oxide powders and the transparent ceramics exhibit the typical red emission of Eu3+ at ~613 nm (the 5D0→7F2 transition) under charge transfer (CT) excitation. Gd3+ incorporation enhances the photoluminescence and shortens the fluorescence lifetime of Eu3+.",
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