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Mechanochemical synthesis of α‐Al 2 O 3 ‐Cr 3+ (Ruby) and χ‐Al 2 O 3
Author(s) -
CortesVega Fernando D.,
Yang Wenli,
ZarateMedina Juan,
Brankovic Stanko R.,
Calderon Hector A.,
Robles Hernandez Francisco C.
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16171
Subject(s) - raman spectroscopy , materials science , precipitation , chromium , hydrate , doping , analytical chemistry (journal) , transmission electron microscopy , aqueous solution , luminescence , mineralogy , inorganic chemistry , chemistry , nanotechnology , metallurgy , optics , physics , optoelectronics , organic chemistry , chromatography , meteorology
In this work we present a unique method to synthesize χ‐Al 2 O 3 and α‐Al 2 O 3 doped with Cr 3+ (ruby). The ruby is synthesized by mechanical milling of pseudoboehmite that is doped in‐situ with chromium. The doping is carried by adding chromium sulfate hydrate to an aqueous solution rich in aluminum sulfate hydrate. The pH in the solution is controlled to be between 9 and 10 by using ammonia, which induces the pseudoboehmite precipitation. The Cr 3+ is added for its remarkable effects on the detectability of ruby emitting luminescent R 1 and R 2 bands that are traceable in Raman spectroscopy. The formation of ruby is detected at milling times as short as 5 hours and increased with the milling time. Ruby phase is further confirmed by means of true atomic resolution Transmission Electron Microscopy ( TEM ).