Ceramics-Silikáty |
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SYNTHESIS AND CHARACTERIZATION OF SrTiO₃-HYDROXYAPATITE COMPOSITE CERAMICS PREPARED BY MICROWAVE-ASSISTED SINTERING FOR ELECTRO-ACTIVE BIOMEDICAL APPLICATIONS
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Ibrahim Khalid Elfaki 1, Kassim Hamoud A. 2
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1 Department of Zoology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
2 Department of Physics and Astronomy, College of Science, King Saud University. P.O. Box 2455, Riyadh 11451, Saudi Arabia.
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Keywords: Strontium titanate, Hydroxyapatite, Solid-state reaction, X-ray diffraction, Dielectric constant, Electrical conductivity, Nanoindentation, Biomedical ceramics.
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The present study investigates the synthesis and characterization of SrTiO₃ (ST) and SrTiO₃-hydroxyapatite (HA) composite ceramics prepared via a solid-state reaction combined with microwave-assisted sintering. The microwave processing enabled controlled microstructural development with reduced grain growth. Structural analysis by X-ray diffraction (XRD) and transmission electron microscopy (TEM) confirmed phase purity of ST and the formation of a homogeneous biphasic ST-HA composite. The dielectric constant of pure ST measured at 1 MHz decreased from 248 to 188 in the 50ST-50HA composite, accompanied by a reduction in electrical conductivity from 4.98 × 10-⁵ to 3.76 × 10-⁵ S·cm-1 . These changes are attributed to the incorporation of electrically insulating HA, which modifies interfacial polarization processes. Nanoindentation analysis revealed differences in mechanical response, with the composite exhibiting improved load-bearing capacity and enhanced elastic recovery compared to pure ST. The combined structural, electrical, and mechanical characteristics suggest that ST-HA composites are promising candidates for electroactive ceramic systems, where a balance between dielectric response and mechanical compliance is required. |
doi: 10.13168/cs.2026.0016
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