A5042958228- Luminescence Properties of Advanced Materials
- Microwave Dielectric Ceramics Synthesis
- Ga2O3 and related materials
- Inorganic Fluorides and Related Compounds
- Glass properties and applications
- Nuclear materials and radiation effects
- Crystal Structures and Properties
- Pigment Synthesis and Properties
- Transition Metal Oxide Nanomaterials
- Ferroelectric and Piezoelectric Materials
- Gas Sensing Nanomaterials and Sensors
- Electronic and Structural Properties of Oxides
- Advanced Condensed Matter Physics
- Solid-state spectroscopy and crystallography
- Photorefractive and Nonlinear Optics
- Global Public Health Policies and Epidemiology
- Earthquake Detection and Analysis
- ZnO doping and properties
- Surface Roughness and Optical Measurements
- Geomagnetism and Paleomagnetism Studies
- Magnesium Oxide Properties and Applications
- Solid State Laser Technologies
- Magnetic and transport properties of perovskites and related materials
- Advanced Photocatalysis Techniques
- Water Quality Monitoring and Analysis
Universidade do Estado do Rio de Janeiro
2015-2024
Universidade Federal Rural do Rio de Janeiro
2024
Universidade Federal do Rio de Janeiro
1994-1995
The influence of site-symmetry and electron phonon coupling in Cs2NaAlF6:Cr3+ is probed by correlation optical structural measurements. Based on neutron x-ray analysis the structure a distorted R3m¯, exhibiting unique stacking interaction. Selection rules have been used to assign Raman-active zone-center vibrations. Although local bulk mode frequencies differ slightly, indicating that guest Cr3+ ion does not significantly perturb host structure, vibrational indicates coupled first...
Single crystals of 0.5% Cr3+-doped Cs2NaGaF6 were studied by means x-ray diffraction and polarized Raman scattering. The crystal exhibits a unique stacking interaction, with hexagonal structure Rm symmetry. Polarized spectra recorded at 16 300 K reveal sidebands that are ascribed to the local vibrational [CrF6] coordination unit, which differ markedly from those host lattice. results compared findings for other elpasolite lattices, room temperature luminescence quantum yields discussed in...
Fluorescence and excitation data for MgGa2O4:Fe3+ are presented. We have produced by solid state reactions a compound in which near infrared emission broadband at 77 K as well room temperature was observed. The is attributed to the spin-forbidden 4T1(4G) → 6A1(6S) electronic transition of Fe3+ ions tetrahedral sites.