Abstract
La 0.4Ba 0.6Ti 0.6RE 0.4O 3 (where RE = Y, Yb) powders were synthesised by the mixed oxide route. According to laboratory X-ray diffractometry both compositions are single-phase and can be indexed on the P m 3 ¯ m space group; however, electron diffraction suggests the occurrence of anti-phase octahedral tilting or 1:1 ordering. Ceramics fired at 1600 °C for 4 h exhibit an average grain size of ∼20 μm. Bright field TEM images suggest the occurrence of chemical inhomogeneity in both compositions. The dc conductivities and Raman spectra are similar for both compositions; however, La 0.4Ba 0.6Ti 0.6Y 0.4O 3 ceramics exhibit ɛ r ∼ 57, quality factor ( Qf) ∼ 750 GHz and temperature coefficient of resonance (TCF) ∼ 12 ppm/K, whereas La 0.4Ba 0.6Ti 0.6Yb 0.4O 3 ceramics exhibit ɛ r ∼ 65, Qf ∼ 4500 GHz and TCF ∼ 1 ppm/K.
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