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In this study, Ca 4−x La 2+x Ti 5−x B x O 17  (B = Al, Ga; x = 0, 1) ceramics were processed via a mixed oxide solid state sintering route and characterized using XRD, SEM, EDS and Vector Network Analyzer. Phase analysis of the samples showed single phase formation for the sample x = 0 while secondary phases formed for Ca 4−x La 2+x Ti 5−x B x O 17  (B = Al, Ga; x = 1) ceramics. Ca 4 La 2 Ti 5 O 17  exhibited ∈ r  = 74, Q×f o  = 14,116 GHz and τ f  = 157 ppm/°C. The substitution of Ga or Al for Ti at the B-site of Ca 4 La 2 Ti 5 O 17  ceramics significantly improved the microwave dielectric properties i.e. Ca 3 La 3 Ti 4 GaO 17  and Ca 3 La 3 Ti 4 AlO 17  have ∈ r  = 44, Q×f o  = 16,128 GHz and τ f  = 7.3 ppm/°C and ∈ r  = 46, Q×f o  = 13,754 GHz and τ f  = −2 ppm/°C, respectively. The microwave dielectric properties of these materials are suitable for high frequency microwave applications.

Ca4−xLa2+xTi5−xBxO17 (B = Al, Ga) dielectric ceramics for microwave applications

Ca_4−xLa_2+xTi_5−xB_xO₁₇ (B = Al, Ga) dielectric ceramics for microwave applications