Abstract
Even though the luminescence process in sapphire has been widely investigated, the relation between the presence of specific impurities such as titanium and iron, and the way the crystal grows up, is enlightened here thanks to the cathodoluminescence (CL) approach. The role of each impurity, taking into account its different valence states and the correlation between all the possible ions, i.e. Ti 4+ , Ti 3+ , Fe 3+ , and Fe 2+ is tentatively explained: Ti 4+ will act as a blue emitting centre, Ti 3+ as a red one in a complex luminescence process, while Fe 2+ will act as a quenching centre. Thus, the crystal growth process, Verneuil process, can be totally described as for the distribution of the impurities needed to generate the sapphires. Particularly, growth bands find an explanation regarding these distributions of iron and titanium in their different valence states.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
