Journal of the American Ceramic Society · 1981 · 129 citations · 6 references
Natural SciencesMaterials EngineeringMaterials ScienceCeramic MaterialsInorganic ChemistryMaterials CharacterizationGrain Structure AnalysisGrain Structure FormationMicrostructure AnalysisScanning Probe MicroscopyBarium Titanate CeramicsElectron Probe MicroanalysisFracture SurfacesGrain BoundariesMicroanalysisQuenched PhasesTitanium Oxides
Scanning electron microscopy and electron probe micro‐analysis were used to investigate the microstructure of both slow‐cooled and quenched polycrystalline BaTiO 3 specimens with a small excess of TiO 2 (Ba/Ti=0.995 to 0.999) or of BaO (Ba/Ti=1.002 and 1.005). The electron micrographs of polished and etched TiO 2 ‐excess BaTiOs samples, and of fracture surfaces of quenched samples, showed a second phase in the grain boundaries and triple‐point regions, whereas no second phase was observed in samples having Ba/Ti=1.000. Microprobe analysis of the second phase gave compositions near that of the reported adjacent phase of higher TiO 2 content, Ba 6 Ti 17 O 40 . The results indicate that the solubility of TiO 2 in BaTiO 3 is <0.1 mol%.
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Subsolidus phase relations in the BaTiO3TiO2 system
T. Negas, R.S. Roth, H.S. Parker et al. · Journal of Solid State Chemistry · 1974 · 180 citations