Abstract
AnBnO3n+2 (n = 4.5) type layered perovskite ceramics with general formula A9B9O31 (A = La; B = Ti, Mg, Sc, Fe, Al, Ga) were prepared via a mixed oxide solid state sintering route. X-ray diffraction analysis revealed single phase La9(TiB)9O31 (B = Ti, Mg, Sc, Fe, Al, Ga) solid solutions with orthorhombic (Pnma) symmetry when sintered at 1500–1650 °C for 4–12 h. The temperature coefficient of resonance frequency (τf) was influenced by the polarizability of B-site cations while relative permittivity (εr) and quality factor (Q × fo) were dependent on the relative density. The samples investigated in the present study exhibited reasonable εr (39–48.3), high Q × fo (11823–19070 GHz) and near zero τf (−1.28 to −22.16 ppm/°C). These ceramics might be potential candidates for microwave devices.
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