•Zinc borate glass lowered the sintering temperature of willemite effectively.•A non-reactive sintering mechanism was discussed in detail.•A new dielectric for LTCC was providedIn this work, the effects of 3ZnO-2B2O3 glass on sintering temperature, phase composition, microstructure and dielectric properties of Zn1.8SiO3.8 ceramics were investigated. The x-ray diffraction results showed that there no reaction between the glass and the ceramic during the sintering process. A mechanism of densification and microstructure evolution of the ceramics with glass was provided based on the x-ray, density and scanning electronic microscopy results. The study on the dielectric properties showed strong dependences of glass content and sintering temperature. At last, the compact ceramic with 20 wt% glass content, exhibited a dielectric constant of 6.5 and a low loss of 0.001, after sintering at 920 °C.

•In this work, we firstly used Mn substitution for Co in BaCo1.0Ti1.0Fe10O19.•Mn Substitution effectively improved microwave absorber and enlarged bandwidth.•The absorbing peak shift to high microwave frequency with Mn substitution.•The coercivity and remanent magnetization increased with Mn substitution.For turning the magnetic resonance frequency and bandwidth of the reflection loss, different amounts of manganese (Mn) were incorporated into the BaCoTiFe10O19 for the substitution of cobalt (Co), then the BaMnxCo1−xTiFe10O19 was obtained via the solid-state reaction method. Subsequently, the effect of the doping Mn2+ on microwave absorption performances was detailedly studied in a frequency range from 2 to 18 GHz. The crystal volume expanded with increasing Mn2+ substitution as confirmed by X-ray diffraction results. No significant morphology change could be found in the scanning electron microscope images when Co2+ was partially substituted by Mn2+, but the coercivity and remanent magnetization raised as Mn2+ increased. The complex permittivity and permeability were collected by the vector net-analyzer and the absorbing properties were calculated according to transmission theory. The absorption peak shifted to higher frequencies with the substitution. The maximum loss value of −30.5 dB at 13.4 GHz was observed for the x = 0.6 sample. Based on the magnetic and microwave measurements, BaMnxCo1−xTiFe10O19 may be a good candidate for electromagnetic compatibility and other practical applications at high frequencies.