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Title: Microstructure and optical properties of hot isostatically pressed Nd:YAG ceramics

Abstract

Neodymium-doped transparent yttrium-aluminum garnet (Y{sub 3}Al{sub 5}O{sub 12}, YAG) (Nd:YAG) ceramics for solid-state laser material were fabricated by a solid-state reaction method using high-purity powders (Al{sub 2}O{sub 3}, Y{sub 2}O{sub 3}, and Nd{sub 2}O{sub 3}) as starting materials and capsule-free hot isostatic pressing (HIP). The mixed powder compacts were presintered at 1,600 C for 3 h under vacuum, hot isostatically pressed at 1,500--1,700 C for 3 h under 9.8 or 1.96 MPa of argon gas pressure, and then sintered again at 1,750 C for 20 h under vacuum. Although the presintered specimen approached full density after HIP, its optical transmittance was quite low ({approximately}5% at 1,000 nm) because of lack of grain growth. Grain growth was observed in the specimens that were hot isostatically pressed and vacuum sintered at 1,750 C for 20 h, but numerous pores occurred around the surface of these specimens. Consequently, the optical transmittance of Nd:YAG ceramics that were treated by HIP was inferior to that of the same ceramics that were sintered under vacuum only because of light scattering that was caused by the pores (at the grain boundaries) that were produced during the HIP treatment.

Authors:
 [1];  [2]
  1. Krosaki Corp., Kitakyushu (Japan). Technical Research Center
  2. Nagaoka Univ. of Technology (Japan). Dept. of Materials Science and Technology
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
282218
Resource Type:
Journal Article
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 79; Journal Issue: 7; Other Information: PBD: Jul 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; ALUMINIUM OXIDES; HOT PRESSING; MICROSTRUCTURE; OPTICAL PROPERTIES; FERRITE GARNETS; YTTRIUM COMPOUNDS; NEODYMIUM; SOLID STATE LASERS; LASER MATERIALS; DOPED MATERIALS; POWDERS; BULK DENSITY; TEMPERATURE DEPENDENCE; GRAIN GROWTH; POROSITY; GRAIN BOUNDARIES; SCANNING ELECTRON MICROSCOPY; OPTICAL MICROSCOPY; X-RAY SPECTROSCOPY; LIGHT TRANSMISSION

Citation Formats

Ikesue, A, and Kamata, K. Microstructure and optical properties of hot isostatically pressed Nd:YAG ceramics. United States: N. p., 1996. Web. doi:10.1111/j.1151-2916.1996.tb08015.x.
Ikesue, A, & Kamata, K. Microstructure and optical properties of hot isostatically pressed Nd:YAG ceramics. United States. https://doi.org/10.1111/j.1151-2916.1996.tb08015.x
Ikesue, A, and Kamata, K. 1996. "Microstructure and optical properties of hot isostatically pressed Nd:YAG ceramics". United States. https://doi.org/10.1111/j.1151-2916.1996.tb08015.x.
@article{osti_282218,
title = {Microstructure and optical properties of hot isostatically pressed Nd:YAG ceramics},
author = {Ikesue, A and Kamata, K},
abstractNote = {Neodymium-doped transparent yttrium-aluminum garnet (Y{sub 3}Al{sub 5}O{sub 12}, YAG) (Nd:YAG) ceramics for solid-state laser material were fabricated by a solid-state reaction method using high-purity powders (Al{sub 2}O{sub 3}, Y{sub 2}O{sub 3}, and Nd{sub 2}O{sub 3}) as starting materials and capsule-free hot isostatic pressing (HIP). The mixed powder compacts were presintered at 1,600 C for 3 h under vacuum, hot isostatically pressed at 1,500--1,700 C for 3 h under 9.8 or 1.96 MPa of argon gas pressure, and then sintered again at 1,750 C for 20 h under vacuum. Although the presintered specimen approached full density after HIP, its optical transmittance was quite low ({approximately}5% at 1,000 nm) because of lack of grain growth. Grain growth was observed in the specimens that were hot isostatically pressed and vacuum sintered at 1,750 C for 20 h, but numerous pores occurred around the surface of these specimens. Consequently, the optical transmittance of Nd:YAG ceramics that were treated by HIP was inferior to that of the same ceramics that were sintered under vacuum only because of light scattering that was caused by the pores (at the grain boundaries) that were produced during the HIP treatment.},
doi = {10.1111/j.1151-2916.1996.tb08015.x},
url = {https://www.osti.gov/biblio/282218}, journal = {Journal of the American Ceramic Society},
number = 7,
volume = 79,
place = {United States},
year = {Mon Jul 01 00:00:00 EDT 1996},
month = {Mon Jul 01 00:00:00 EDT 1996}
}