TY  - JOUR
AU  - Ahmad, Tauqeer
AU  - Lei, Wen
AU  - Ullah, Burhan
AU  - Lu, Wen-zhong
PY  - 2026
TI  - Low-loss (Sr,Ce)TiO3—Sr2CeO4—B2O3 ceramics composite featuring balanced microwave dielectric properties for miniaturized wireless communication applications
JO  - Journal of Materiomics
SN  - 2352-8478
VL  - 12
IS  - 2
AB  - A series of (Sr0.4Ce0.4)TiO3 + 4% (in mass) Sr2CeO4 + x% B2O3 (SCTO + 4% SCO + x% B2O3 for 1≤ x ≤ 5) composites were synthesized via solid-state reaction to investigate the effects of Sr2CeO4 and B2O3 additives on their structural evolution and microwave dielectric properties. X-ray diffraction (XRD) and Rietveld refinement confirmed the dominant orthorhombic phase (O-phase), with SCO as a secondary phase, indicating a chemically stable composite system. HRTEM and SAED analyses further confirmed the formation of the O-phase through direct observation of the superlattice reflections. Microstructural evolution demonstrated B2O3-assisted liquid-phase sintering, reducing porosity (0.017 → 0.006) and increasing grain size (3.34 → 6.01 μm) with increasing x% (in mass). Raman spectroscopy verified octahedral tilting and Ce—O stretching, while B2O3 incorporation modified the TiO6 network via BO3/BO4 interactions. The εr decreased from 113 (SCTO) to 27 at x = 5%, while τf improved from +213 to +12 × 10−6/℃. The reduction in εr arises from a complex interplay of internal factors (ionic polarizability) and external factors (porosity, and density), whereas the variation in τf is governed by compensating effects from Sr2CeO4 and B2O3. Optimal microwave performance was achieved at x = 5%, with Q×f = 43,603 GHz, εr = 27, and τf of +12 × 10−6/℃. The study demonstrates that SCO and B2O3 act as effective modifiers, enhancing densification and dielectric properties in SCTO-based microwave ceramics.
UR  - https://doi.org/10.1016/j.jmat.2025.101157
DO  - 10.1016/j.jmat.2025.101157