Although traditional spinel oxides exhibit excellent microwave dielectric or thermosensitive properties, achieving linear negative temperature coefficient (NTC) behaviour and stable microwave dielectric performance simultaneously across a wide temperature range remains challenging, making it impossible to meet the stringent requirements for multifunctional integration in 6G front-end devices. This study developed Sc³⁺-modified Mg-Al-Mn-Fe-O spinel ceramics through B-site cation doping, breaking through this performance trade-off bottleneck. On the one hand, Sc³⁺ inhibits the formation of oxygen vacancies and regulates the Mn/Fe valence ratio, achieving highly linear thermosensitive characteristics across an ultra-wide temperature range of 200-1000°C (B_{200°C/1000°C} = 8367-9758 K). On the other hand, through the lattice stabilisation effect induced by Sc³⁺ and the octahedral site bond strength enhancement mechanism, excellent microwave dielectric properties were simultaneously obtained: low dielectric constants (ε_r = 8.86-10.55), ultrahigh quality factor (Q·f= 96,000-149,000 GHz), and near-zero temperature coefficient of resonant frequency (τ_f = -33.2 to -10.2×10^-6/°C). The cylindrical dielectric resonator antenna developed based on the prepared ceramic achieved 92% radiation efficiency and 6.28 dBi gain in the 12 GHz frequency band, verifying its engineering application potential in satellite communication front-end modules.

Industrial emissions of sulfur dioxide (SO₂) and nitrogen oxides (NOₓ) in production and daily life contribute to acid rain formation, which degrades soil and aquatic ecosystems while impairing human respiratory health.

Semantic communications have revolutionized wireless communication in this century. In a new study, SeoulTech researchers have investigated ConcreteSC, a novel digital communication framework that eliminates massive codebooks in semantic communication systems through temperature-controlled concrete distributions. The research demonstrates up to threefold improvements in image quality metrics and 39x faster processing speeds compared to traditional vector quantization methods in wireless communication systems.

Tuning magnetic properties in quasicrystals is limited by fixed elemental ratios set by stoichiometry. Now, researchers from Japan developed a “double hetero-valent elemental substitution” method, where atoms are replaced with others of different valency but similar size. Applying this to a Ga-based approximant crystal, they substituted gallium and platinum with gold, transforming the material’s magnetic state from spin-glass to ferromagnetic. The approach allows precise magnetic control, paving the way for advanced magnetocaloric materials.