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1 Materials Science Poland

1 2016

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Fabrication and characterization of nanostructured Ba-doped BiFeO3 porous ceramics

Mostafavi E., Ataie A.

Materials Science Poland

2016

Vol. 34, No. 1

148--156

Nanostructured barium doped bismuth ferrite, Bi0.8Ba0.2FeO3 porous ceramics with a relatively high magnetic coercivity was fabricated via sacrificial pore former method. X-ray diffraction results showed that 20 wt.% Ba doping induces a structural phase transition from rhombohedral to distorted pseudo-cubic structure in the final por(o)us samples. Moreover, utilizing Bi0.8Ba0.2FeO3 as the starting powder reduces the destructive interactions between the matrix phase and pore former, leading to an increase in stability of bismuth ferrite phase in the final porous ceramics. Urea-derived Bi0.8Ba0.2FeO3 porous ceramic exhibits density of 4.74 g/cm3 and porosity of 45 % owing the uniform distribution of interconnected pores with a mean pore size of 7.5 mu m. Well defined nanostructured cell walls with a mean grain size of 90 nm were observed in the above sample, which is in a good accordance with the grain size obtained from BET measurements. Saturation magnetization decreased from 2.31 in the Bi0.8Ba0.2FeO3 compact sample to 1.85 A.m2 /kg in urea-derived Bi0.8Ba0.2FeO3 porous sample; moreover, coercivity increased from 284 to 380 kA/m.