Abstract
Dielectric properties of A(B3+1/2B5+1/2)O3 (A = Ba, Ca, Sr; B3+= La, Nd, Sm, Yb; B5+= Nb, Ta) ceramics have been investigated at microwave frequencies. Sr(B3+1/2B5+1/2)O3 and Ca(B3+1/2B5+1/2)O3 ceramics have relative dielectric constants (εr) above 20 and negative temperature coefficients of resonant frequency (Tf). In the group of Ba(B3+1/2B5+1/2)O3 ceramics, Tf changes from + 118 ppm/° to nearly zero according to the kinds of B‐site ions. Among the ceramics investigated, Sr(Sm1/2Ta1/2)O3 ceramics have the highest Q values at microwave frequencies. For Sr(Sm1/2Ta1/2)O3 ceramics Q= 7000, εr= 27.7, and Tf=−62.5 ppm/° at 8.5 GHz. The microstructure of Sr(Sm1/2Ta1/2)O3 ceramics is composed of a matrix of the ternary compound (Sr‐Sm‐Ta‐O system) and secondary phase grains of the binary compound (Sm‐Ta‐O system).
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