Dielectric properties of perovskite antimonates

In the search for lower dielectric constant substrates for use in a high critical temperature superconducting (HTSC) microwave technology, the dielectric constants and microwave loss tangents determined from the complex dielectric properties measured at 10 GHz and 300 K are reported for numerous perovskite antimonates like A/sub 2/MeSbO/sub 6/ where A=Ba or Sr, Me=a rare-earth, Y, Sc, Ga or In and A/sub 4/MeSb/sub 3/O/sub 12/ where A=Ba or Sr and Me=Li, Na or K. Using these material properties, the Clausius-Mossotti relationship and a nonlinear regression fitting program, the polarizability of Sb/sup 5+/ has been investigated and determined to be 1.18/spl plusmn/0.49 /spl Aring//sup 3/ which makes it an excellent candidate for use as a constituent in a HTSC microwave substrate technology.