Synthesis and characterisation of La0.4Ba0.6 Ti0.6RE0.4O3 (where RE = Y, Yb) ceramics

A. Feteira, R. Elsebrock, A. Dias, R. L. Moreira, M. T. Lanagan, D. C. Sinclair

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La0.4Ba0.6Ti0.6RE0.4 O3 (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, La0.4Ba0.6 Ti0.6Y0.4O3 ceramics exhibit εr ∼ 57, quality factor (Qf) ∼ 750 GHz and temperature coefficient of resonance (TCF) ∼ 12 ppm/K, whereas La0.4Ba0.6Ti0.6Yb0.4 O3 ceramics exhibit εr ∼ 65, Qf ∼ 4500 GHz and TCF ∼ 1 ppm/K.

Original languageEnglish (US)
Pages (from-to)1947-1951
Number of pages5
JournalJournal of the European Ceramic Society
Issue number10-11
StatePublished - 2006

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry


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