Abstract
An electron paramagnetic resonance (EPR) investigation on Ti-doped MgAl2O4 spinels has been made in order to study the Ti3+ sites. The study we present here concerns the angular dependencies of the Ti3+ EPR lines and the variations of the EPR spectra due to a modification of the TiO2 content or of the chemical composition from MgAl2O4 to MgAl4O7 and MgAl6O10. In all the studied samples except one, we observe the presence of both Mn2+ and Ti3+ ions. No correlation was observed between Ti3+ amount and TiO2 content; the titanium ions are located in three different sites: the octahedral B site of the spinel structure; the tetrahedral A site and a last site which remains unclear. On the contrary, the major part of the Mn2+ ions is assumed to be in the tetrahedral A site of the spinel structure and a minor part in the octahedral B site. Our work demonstrates the overall interest of EPR spectroscopy in the study of the paramagnetic optically active ions inside optical materials.
Original language | English |
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Pages (from-to) | 899-903 |
Number of pages | 5 |
Journal | Journal of Crystal Growth |
Volume | 311 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2009 Jan 15 |
Keywords
- A1. Characterization
- A1. Crystal structures
- A2. Growth from melt
- B1. Titanium compounds
ASJC Scopus subject areas
- Condensed Matter Physics
- Inorganic Chemistry
- Materials Chemistry