PREPARATION AND STUDYING THE PHYSICAL AND ELECTRICAL PROPERTIES OF BARIUM TITANATE DOPED WITH STRONTUM AND EUTERIUM

S. Mer, Amel; W. Jameel, Walaa; R. Muhammed, Khalid

	PREPARATION AND STUDYING THE PHYSICAL AND ELECTRICAL PROPERTIES OF BARIUM TITANATE DOPED WITH STRONTUM AND EUTERIUM
AL-TAQANI
Article 1, Volume 23, Issue 1, 2010, Pages 19-28
Authors
Amel S. Mer; Walaa W. Jameel; Khalid R. Muhammed
Abstract
Barium titanate (BaTiO3) have been prepared by mixing equimolares of titanium dioxide (TiO2) and barium carbonate .Identification of the calcined powder achieved by using X-ray diffraction technique to know the purity of the powder and the crystal phase. Sintering is done at different temperature (11000C,12000C,13000C) .The best sintering temperature is 13000C ,it gives the higher bulk density (5.36g/cm3) , minimum percentage porosity (6%) ,and maximum linear shrinkage (18%). The prepared barium titanate doped with different ratios of rare earth oxides {Strontium oxide (SrO)and Europium oxide(Eu2O3)} . It appears that the addition of these oxides in ratio of (0.3%) gives an increase in density to reach a maximum value of (5.56g/cm3 for SrO and 5.53 g/cm3 for Eu2O3 ), and reduction in porosity to reach a minimum value of (5% for SrO and 4.5% for Eu2O3 ) . The oxide addition leads to increase the dielectric constant to reach a maximum value (2775.3 for Eu2O3 and 3867.5 for SrO ) ,then decreases with increasing the oxides concentration at temperature (300C) and frequency 1kHz. Addition of (SrO) and (Eu2O3) at ratio 0.3% leads to decreasing the electrical resistivity to reach a minimum value (0.781010 ) for Eu2O3 and 0.691010 for SrO then increased with increasing the oxide concentration at 300C.
Keywords
Electrical properties of barium titanate; Doping of barium titanate with rare earth elements; Piezoelectric materials

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