PRECIPITATES IN THERMOCHEMICALLY REDUCED NICKEL-DOPED SAPPHIRE

Authors
BALLESTEROS C CHEN Y CHEN Y GONZALEZ R KOKTA MR ZONG XF
Citation
C. Ballesteros et al., PRECIPITATES IN THERMOCHEMICALLY REDUCED NICKEL-DOPED SAPPHIRE, Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties, 76(2), 1997, pp. 357-365
Citations number
30
Categorie Soggetti
Physics, Applied","Material Science","Physics, Condensed Matter","Metallurgy & Metallurigical Engineering
Journal title
Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties → ACNP
ISSN journal
13642804
Volume
76
Issue
2
Year of publication
1997
Pages
357 - 365
Database
ISI
SICI code
1364-2804(1997)76:2<357:PITRNS>2.0.ZU;2-L
Abstract
Nickel-doped Al2O3 (sapphire) crystals have been studied using optical absorption and transmission electron microscopy. After reduction at e levated temperatures in a hydrogen atmosphere, these crystals exhibit a dark colouration. Our results indicate that the colouration is due t o Mie scattering from precipitates resulting from the reduction proces s. Analytical transmission electron microscopy techniques revealed the presence of metallic precipitates and identified them as Al3Ni. The p recipitate distribution is very inhomogeneous.