Barium Titanate-Based Glass-Ceramics Crystallized from Multicomponent Oxide Glasses: Phase Composition and...

Area of Science:

• Materials Science
• Solid State Chemistry
• Dielectric Materials

Background:

• Growing demand for advanced dielectric materials in electronic and sensor devices.
• Need for novel glass-ceramics with tailored properties for electronic components.

Purpose of the Study:

• Synthesize and characterize novel dielectric glass-ceramics in the Na2O/Al2O3/BaO/ZrO2/TiO2/B2O3/SiO2 system.
• Investigate the effect of controlled thermal treatment on crystallization and microstructure.
• Evaluate the dielectric properties for potential electronic applications.

Main Methods:

• Melt-quenching technique for glass synthesis.
• Controlled thermal treatment for crystallization into glass-ceramics.
• X-ray diffraction (XRD) for phase identification.
• Scanning electron microscopy (SEM) for microstructure analysis.
• Microcomputed X-ray tomography (µCT) for volumetric analysis.
• Impedance spectroscopy for dielectric property evaluation.

Main Results:

• Successful synthesis of glass-ceramics containing Ba2TiSi2O8 (fresnoite) and BaTiO3 (likely as BaZrxTi1-xO3 solid solution).
• Microstructure characterized by mulberry-shaped, densely-branching crystallized structures.
• Crystallization volume fraction and average size increase with longer annealing times.
• Dielectric properties exhibit insulating behavior with high dielectric constants (≥100) and moderate loss tangent at 10 kHz.

Conclusions:

• The synthesized glass-ceramics possess desirable dielectric properties for electronic applications.
• Thermal treatment parameters significantly influence the microstructure and dielectric performance.
• These materials show promise as advanced dielectric components in electronic devices.