Fabrication and characterization of nanostructured Ba-doped BiFeO₃ porous ceramics

Abstract

Nanostructured barium doped bismuth ferrite, Bi 0.8 Ba 0.2 FeO 3 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 Bi 0.8 Ba 0.2 FeO 3 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 Bi 0.8 Ba 0.2 FeO 3 porous ceramic exhibits density of 4.74 g/cm 3 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 Bi 0.8 Ba 0.2 FeO 3 compact sample to 1.85 A·m 2 /kg in urea-derived Bi 0.8 Ba 0.2 FeO 3 porous sample; moreover, coercivity increased from 284 to 380 kA/m.

Performance Enhancement of Ce0.8Sm0.2O1.9-Supported SOFC by Electrophoretic Formation of Modifying BaCe0.8Sm0.2O3 and Ce0.8Sm0.1Pr0.1O1.9 Layers

“…The main criteria for the electrode choice were their excellent electrochemical activity at decreased operating temperatures. La 0.6 Sr 0.4 Fe 0.8 Co 0.2 O 3−δ (LSFC) is the most often used in SOFCs with doped CeO 2 electrolyte membranes due to its high conductivity and excellent electro-catalytic activity to ORR in the IT-range [52,53]. It is generally accepted that the electrochemical performance of LSFC can be further improved by mixing the cathode material with an electrolyte [35,54,55].…”

Fabrication of Three-Dimensional Scaffolds Based on Nano-biomimetic Collagen Hybrid Constructs for Skin Tissue Engineering

“…8,13 Additionally, porosity and interconnected architecture of 3D scaffolds is necessary for ideal functionality. 14,15 The aim of this study was to design and fabricate Col hybrid scaffolds for skin TE. In this study, four types of 3D porous scaffolds were prepared, using combinations of polycaprolactone (PCL), PLLA, and Col and then characterized by hydrogen nuclear magnetic resonance ( 1 H NMR), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM).…”

“…However, these biopolymers do not have enough mechanical strength supporting cell seeding and post transplantation physical supports. To solve this problem, a number of biodegradable synthetic polymers with appropriate mechanical properties can be used for the fabrication of porous scaffolds such as poly­(glycolic acid), poly­( dl -lactic- co -glycolic acid), and poly­( l -lactic acid) (PLLA). , Additionally, porosity and interconnected architecture of 3D scaffolds is necessary for ideal functionality. , The aim of this study was to design and fabricate Col hybrid scaffolds for skin TE. In this study, four types of 3D porous scaffolds were prepared, using combinations of polycaprolactone (PCL), PLLA, and Col and then characterized by hydrogen nuclear magnetic resonance ( 1 H NMR), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM).…”