Structure-Property Correlation in Ba/Sr-Ca-Mg-Zn-Si-Al-O Glass: Elucidation by Experimental and Molecular Dynamics...

Area of Science:

• Materials Science
• Glass Science
• Optoelectronics

Background:

• Broadband transmitting glasses for optics and laser technology require a balance of optical transmission (visible to mid-infrared), mechanical strength, chemical durability, glass-forming ability, and thermal stability.
• Low phonon energy glasses offer extended mid-infrared transmission but often struggle to retain other essential properties.
• Calcium magnesium zinc silica-aluminate (CMZSA) glasses are a candidate material, but optimizing their properties remains a challenge.

Purpose of the Study:

• To investigate the potential of mixed alkaline earth substitutions (BaO/SrO) in CMZSA glass for improving overall properties while maintaining low phonon energy.
• To analyze the structure-property relationships using both computational and experimental methods.
• To identify optimal compositions for enhanced glass performance in optical and laser applications.

Main Methods:

• Partial substitution of CaO with BaO and SrO in CMZSA glass formulations.
• Molecular dynamics (MD) simulations for quantitative structure analysis.
• Experimental techniques to evaluate glass properties (optical, thermal, mechanical).

Main Results:

• Mixed alkaline earth substitutions, particularly SrO, improve glass properties without compromising low phonon energy.
• Structural analysis revealed specific coordination states of Al, Si, Zn, and Mg, and the roles of Ba²⁺ and Sr²⁺ ions as charge compensators and network modifiers.
• SrO-added glass exhibited the highest concentration of bridging oxygens, correlating with superior optical, thermal, and mechanical characteristics and a more stable network.

Conclusions:

• Partial substitution of CaO with SrO in CMZSA glass is an effective strategy to enhance network stability and overall glass properties.
• The improved properties, including optical, thermal, and mechanical performance, make SrO-modified CMZSA glasses highly suitable for optics and laser technology.
• This study provides a pathway for designing advanced glass materials with tailored properties for demanding applications.