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Microwave dielectric properties of La 3+ -doped (Pb 1−  x   Ca  x  )(Fe 0.5 Nb 0.5 )O 3  ( x  = 0.5–0.6) ceramics were investigated, and a superstructure was detected in these ceramics. The dielectric constant (∊ r ) and the temperature coefficient of the resonant frequency ( TCF ) decreased, while the  Qf  value of the specimens increased with the increase in Ca 2+  content. At the same Ca 2+  content, the ∊ r  and  Qf  values of La 3+ -doped specimens were much higher than those of undoped ones. This is attributed to the elimination of oxygen vacancies by the solid solution of surplus La 3+  with (Pb, Ca) 2+ . Excellent microwave dielectric properties of  Qf  =  6795 GHz, ∊ r  = 96.41 with  TCF  = −4.99 ppm · K −1  were obtained at  x  = 0.55.

Effect of La 3+ on microwave dielectric properties of (Pb 1− x Ca x )(Fe 0.5 Nb 0.5 )O 3 ( x = 0.5–0.6) ceramics