Improved Microwave Dielectric Properties of La(Mg_0.5Sn_0.5)O₃ Ceramic with Sr²⁺ Substitution

Abstract

The microwave dielectric properties of La(Mg_0.5−xSr_xSn_0.5)O₃ ceramics were examined with a view to their exploitation for wireless communications. The La(Mg_0.5−xSr_xSn_0.5)O₃ ceramics were prepared by the conventional solid-state method with various sintering temperatures. The La(Mg_0.5−xSr_xSn_0.5)O₃ ceramics contained La₂Sn₂O₇. An apparent density of 6.56 g/cm³, a dielectric constant (ϵ _r ) of 20.5, a quality factor (Q × f) of 107,900 GHz, and a temperature coefficient of resonant frequency (τ _f ) of −84 ppm/°C were obtained for La(Mg_0.4Sr_0.1Sn_0.5)O₃ ceramics that were sintered at 1500°C for 4 h.

Keywords:

• La(Mg_0.5−xSr_xSn_0.5)O₃
• dielectric constant
• quality factor
• temperature coefficient of resonant frequency

Acknowledgments

Communicated by Professor Dr. George W. Taylor