Eu oxidation state in fluorozirconate-based glass ceramics

Area of Science:

• Materials Science
• Solid State Chemistry
• Spectroscopy

Background:

• Europium-doped glass ceramics are crucial for optical applications.
• Understanding dopant behavior and phase formation is key to tailoring material properties.

Purpose of the Study:

• To investigate the effects of InF(3) doping and remelting on Eu-doped fluorozirconate-based glass ceramics.
• To analyze the resulting changes in europium ion valence states and nanoparticle structures.

Main Methods:

• Near-edge X-ray Absorption Spectroscopy (XAS)
• Optical Spectroscopy
• Photoluminescence Spectroscopy

Main Results:

• InF(3) addition decreased the europium (Eu(2+)/Eu(3+)) mole ratio.
• Remelting significantly shifted the Eu(2+)/Eu(3+) ratio towards Eu(2+).
• Annealing induced BaCl(2) nanoparticle formation, with InF(3) doping causing a hexagonal-to-orthorhombic phase transition in as-made samples.

Conclusions:

• InF(3) doping and remelting are effective methods to control Eu ion valence states in glass ceramics.
• The observed phase transition in nanoparticles is dependent on processing conditions and InF(3) presence.