Effects of TiO2 phases on the structural and dielectric properties of sintered BaTiO3 + x% mol Fe2O3 ceramics
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The objective of this paper is to study the influence of TiO2 phases on the structural and dielectric properties of the BaTiO3ceramics containing different amounts of Fe2O3. The pure BaTiO3 ceramics was prepared by a solid state reaction betweenBaCO3 and both of TiO2 phases, anatase (A) and rutile (R), respectively. We prepared the mixtures by stoichiometric way,which were calcined at 1100 oC during 2hrs. The formations of perovskites structures ABO3 were confirmed by X-raysdiffraction analysis. While the ceramics mixture with (1-x) BaTiO3+ x % Fe2O3 (where x = 1, 2, 5 and 7 wt %) compositionswere prepared by the wet milling. Afterwards, the different pellets were fabricated by uniaxial compression and sintered atdifferent temperatures (1300, 1350 and 1400 oC). The obtained results show an increase in the tetragonality due to the dopingby Fe3+, consequencely an increase in the relative permittivity of samples prepared from TiO2(R) with both of Fe2O3 additionand sintering temperature. On the other hand, for the samples prepared from TiO2 (A) the obtained results show a decreasein both relative density and tetragonality with both of Fe2O3 addition and sintering temperature, as a consequence we get adecrease in the relative permittivity compared with pure BTA.
Abstract
The objective of this paper is to study the influence of TiO2 phases on the structural and dielectric properties of the BaTiO3ceramics containing different amounts of Fe2O3. The pure BaTiO3 ceramics was prepared by a solid state reaction betweenBaCO3 and both of TiO2 phases, anatase (A) and rutile (R), respectively. We prepared the mixtures by stoichiometric way,which were calcined at 1100 oC during 2hrs. The formations of perovskites structures ABO3 were confirmed by X-raysdiffraction analysis. While the ceramics mixture with (1-x) BaTiO3+ x % Fe2O3 (where x = 1, 2, 5 and 7 wt %) compositionswere prepared by the wet milling. Afterwards, the different pellets were fabricated by uniaxial compression and sintered atdifferent temperatures (1300, 1350 and 1400 oC). The obtained results show an increase in the tetragonality due to the dopingby Fe3+, consequencely an increase in the relative permittivity of samples prepared from TiO2(R) with both of Fe2O3 additionand sintering temperature. On the other hand, for the samples prepared from TiO2 (A) the obtained results show a decreasein both relative density and tetragonality with both of Fe2O3 addition and sintering temperature, as a consequence we get adecrease in the relative permittivity compared with pure BTA.
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