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

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New dielectric glass-ceramics were synthesized for electronic applications. Controlled crystallization yielded materials with high dielectric constants (≥100) and moderate loss, showing potential for advanced electronic components.

Keywords:
X-ray diffractionX-ray tomographybarium fresnoitebarium titanatedielectric propertiesglass–ceramicsphase separationrelaxorsscanning electron microscopyzirconium oxide

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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.