<abstract xmlns="http://www.w3.org/1999/xhtml"><p>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 porous 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 μm. 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.</p></abstract>

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 porous 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 μm. 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.

Fabrication and characterization of nanostructured Ba-doped BiFeO<sub>3</sub> porous ceramics

School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box 14395-553, Tehran,

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fabrication and characterization of nanostructured Ba-doped BiFeO porous ceramics

Nanostructured barium doped bismuth ferrite, Bi₀.₈Ba₀.₂FeO₃ porous ceramics with a relatively high magnetic coercivity was fabricated via sacrificial pore...

Sample code	Porous sample identity (Matrix/wt.% of PFs)	Sacrificial pore Formers specification
Sample code	Porous sample identity (Matrix/wt.% of PFs)	Density [g/cm³]	Melting point [°C]	Purity [%]	Resource
BBH	BBFO/30HDPE	0.95	130	Commercial	–
BBP	BBFO/30PVA	1.26	230	>99.0	Merck
BBU	BBFO/30Urea	1.32	133 – 135	>95.0	Merck
BBG	BBFO/30Graphite	2.16	–	>99.0	MP Biomedicals
BBC	BBFO-Compact	–	–	–	–

Porous sample	H_c [kA/m]	M_s [A m²/kg]	M_r [A m²/kg]	Squareness (M_r/M_s)	Reference
BBFO/30wt.% urea	380	1.85	0.97	0.524	Current work
SiOC/35wt.% PMMA	0.7	17	0.06	0.004	[16]
BaFe12O19/PU	46.4	56.5	12.1	0.214	[37]
Ni–Zn ferrite/wood	5.49	56	–	–	[36]

Fabrication and characterization of nanostructured Ba-doped BiFeO₃ porous ceramics

Article Category: Research Article

Published Online: Apr 27, 2016

Page range: 148 - 156

Received: Aug 04, 2015

Accepted: Nov 26, 2015

DOI: https://doi.org/10.1515/msp-2016-0017

Keywords
bismuth ferrite, dopant, nanostructures, porous ceramics, magnetic properties

© 2016 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Porous samples code and specification of sacrificial pore former materials.

Comparison between the RT magnetic properties of BBU porous sample with some porous structures reported earlier.

Fabrication and characterization of nanostructured Ba-doped BiFeO3 porous ceramics

Article Category: Research Article

Published Online: Apr 27, 2016

Page range: 148 - 156

Received: Aug 04, 2015

Accepted: Nov 26, 2015

DOI: https://doi.org/10.1515/msp-2016-0017

Keywordsbismuth ferrite, dopant, nanostructures, porous ceramics, magnetic properties

© 2016 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Porous samples code and specification of sacrificial pore former materials.

Comparison between the RT magnetic properties of BBU porous sample with some porous structures reported earlier.

Fabrication and characterization of nanostructured Ba-doped BiFeO₃ porous ceramics

Keywords
bismuth ferrite, dopant, nanostructures, porous ceramics, magnetic properties