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Hydrothermal synthesis of pure and Dy : BaTiO3 powders at 90 degrees C and their sintering behavior

Oren, EE
Tas, AC
Sub-micron (150-200 nm), monodisperse and spherical powders of pure and Dy-doped (0.8 at%) BaTiO3 have been prepared by "hydrothermal synthesis" at 90 degrees C in an air atmosphere. The powder preparation technique adopted in this work did not necessitate the utilization of strict and expensive measures which were commonly required for the removal of free CO2 present in the atmosphere. The synthesized powders were crystalline, pure, and did not contain BaCO3 as an impurity phase. Pure and Dy-doped BaTiO3 powders synthesized at 90 degrees C had the cubic (space group: Pm-3m) crystal structure. Grain growth characteristics of pure and Dy-doped BaTiO3 pellets were investigated during sintering in air and compared with one another over the temperature range of 1200 to 1500 degrees C. Sample characterization was achieved by XRD, SEM, EDXS, and Rietveld Analysis.