Sintering behaviour, phase composition, microstructure, and dielectric properties of BaSm2O4 microwave ceramics

Influence of sintering characteristics and structural properties on the microwave dielectric properties of non-stoichiometric Ca3Mn2+xGe3O12+δ (x = 0–0.2) ceramics

“…The effect of polarisability on the permittivity is reflected by the Clausius–Mossotty equation and the theoretical permittivity ( ε th ) is calculated as follows: 17 where V is the molecular volume and α is the polarisability of the molecules. The additivity rule for oxides can be used to determine the molecular polarisability of complex compounds, which for CM 2.1 G ceramics is calculated using the following equation: 17 α (Ca 3 Mn 2 Ge 3 O 12 ) = 3 α (Ca 2+ ) + 2 α (Mn 3+ ) + 3 α (Ge 4+ ) + 12 α (O 2− )where α (Ca 2+ ), α (Mn 3+ ), α (Ge 4+ ), and α (O 2− ) are the polarisabilities of Ca 2+ (3.16 Å 3 ), Mn 3+ (2.64 Å 3 ), Ge 4+ (1.63 Å 3 ), and O 2− (2.01 Å 3 ), respectively. The ε th of the CM 2.1 G ceramics is ∼14.17, and a gap remains between the corrected and theoretical values.…”

Machine learning enhanced prediction of permittivity of spinel microwave dielectric ceramics compared to traditional C-M calculation

“…Fang and we have conducted in-depth investigations into spinel MWDCs' stoichiometric engineering and have synthesized various Li-based spinels, including Li 2 ATi 3 O 8 (A = Zn, Co, Mg) [8][9][10], Li 2 M 3 Ti 4 O 12 (M = Co, Zn, Mg) [11][12][13]. Additionally, other spinel oxide ceramics such as SrY 2 O 4 [14], BaSm 2 O 4 [15], and Li 5 Al 5 Zn 8 Ge 9 O 36 [16] were also synthesized. All of these materials exhibit promising potential for applications in mobile communication base stations.…”