Mechanochemical synthesis of α‐Al2O3‐Cr3+ (Ruby) and χ‐Al2O3. Issue 3 (5th November 2018)

• Record Type: Journal Article
• Authors: Cortes‐Vega, Fernando D.; Yang, Wenli; Zarate‐Medina, Juan; Brankovic, Stanko R.; Calderon, Hector A.; Robles Hernandez, Francisco C.
• Is Part Of: Journal of the American Ceramic Society. Volume 102:Issue 3(2019)
• Page Start: 976
• Page End: 980
• Publication Date: 2018-11-05
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.16171
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: In this work we present a unique method to synthesize χ‐Al2 O3 and α‐Al2 O3 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 R1 and R2 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).