Effect of annealing atmosphere on the structural and electrical properties of BiFeO 3 multiferroic ceramics prepared by sol–gel and spark plasma sintering techniques

Wang, Ting; Song, Shenhua; Wang, Meng; Li, J.-Q.

doi:10.1016/j.ceramint.2016.01.129

Cited by 32 publications

(11 citation statements)

References 37 publications

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“…In the samples sintered above 650°C, decomposition of BFO as well as reaction with carbon significantly increased, and those samples were dismissed for further investigation. The latter confirms the results of previous studies [23] showing that in some cases, a pure BFO cannot be obtained by SPS even after post-sintered annealing. Additionally, it has been shown that change of post-sintering annealing atmosphere can significantly affect the phase composition of BFO ceramics sintered by the SPS method.…”

Section: Resultssupporting

confidence: 91%

“…Despite of the fact that many authors reported pure BiFeO 3 phase in ceramics obtained by SPS at temperatures between 625 and 650°C [15,18,19], XRD results ( Fig. 1) Formation of the secondary phases in the SPS samples is related to partial loss of bismuth and oxygen during sintering in inert atmosphere [23], but we should also take into account carbon contamination that was found in some of our samples ( Fig. 1g) and possibility that partial reduction occurred due to the contact between the samples and a graphite die.…”

Section: Resultsmentioning

confidence: 94%

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Spark plasma sintering of hydrothermally synthesized bismuth ferrite

Branković

Golić

Radojković

et al. 2016

PAC

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Bismuth ferrite, BiFeO3 (BFO), powder was synthesized by hydrothermal method from Bi(NO3)3?5H2O and Fe(NO3)3?9H2O as precursors. The synthesized powder was further sintered using spark plasma sintering (SPS). The sintering conditions were optimized in order to achieve high density, minimal amount of secondary phases and improved ferroelectric andmagnetic properties. The optimal structure and properties were achieved after spark plasma sintering at 630?C for 20min, under uniaxial pressure of 90MPa. The composition, microstructure, ferroelectric and magnetic properties of the SPS samples were characterized and compared to those of conventionally sintered ceramics obtained from the same powder. Although the samples sintered using conventional method showed slightly lower amount of secondary phases, the spark plasma sintered samples exhibited favourable microstructure and better ferroelectric properties. [Projekat Ministarstva nauke Republike Srbije, br. III45007]

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 94%

Spark plasma sintering of hydrothermally synthesized bismuth ferrite

Branković

Golić

Radojković

et al. 2016

PAC

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“…Data from unsubstituted BF are included for comparison, which show higher conductivity. The conductivity of BF‐related samples prepared by SPS is much higher than of flash sintered specimens . Microwave sintered samples also show higher conductivity and low activation energies …”

Section: Resultsmentioning

confidence: 96%

Processing and properties of Bi_0.98R_0.02FeO₃ (R = La, Sm, Y) ceramics flash sintered at ~650°C in <5 s

et al. 2019

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We show that flash sintering produces single‐phase, nanograin‐sized polycrystals of isovalent‐substituted multiferroic ceramics of complex compositions. Single‐phase polycrystals of Bi0.98R0.02FeO3 (R = La, Sm, Y) were produced at a furnace temperature of ~650°C in a few seconds by the application of an electric field of 50 V cm−1, with the current limit set to 40 mA mm−2. The dielectric and insulating properties compared favorably with expected values. Impedance spectroscopy suggests electrically homogenous microstructure, except for the sample Bi0.98La0.02FeO3 that shows a small grain boundary contribution to the impedance. These results reinforce the enabling nature of flash sintering for ceramics which pose difficulties in conventional sintering because they contain low melting constituents or develop secondary phases during the sintering protocol.

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“…Various heating temperatures were reported by many researchers ranged from 60-140 °C for drying and evaporation of the solvent followed by calcination at varying temperature for forming BiFeO 3 [11,41,44,[53][54][55][56][57] . Furthermore, according to previous studies [42,53], 400 °C was considered as the crystallization temperature of BiFeO 3 , oppositely, it decomposed above 600 °C and second phases observed [58,59].…”

Section: Resultsmentioning

confidence: 99%

Effect of Preheating Temperature on Synthesis of Pure BiFeO3 via Sol–Gel Method

et al. 2019

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BiFeO 3 (BFO) nanopowder was synthesized in a pure form via a sol-gel method based on glycol gel reaction. Effect of drying and preheating temperature on preventing other phases was studied. Many parameters were studied as calcination temperature and time & stirring temperature as well. The prepared powder was characterized by X-Ray Diffraction of powder (XRD) and Transmission Electron Microscope (TEM). High pure BiFeO 3 was obtained by preheated process at 400 °C for 0.5 h and calcination at 600 °C for 0.5 h without any impurities compared to dry at110 °C.

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Effect of annealing atmosphere on the structural and electrical properties of BiFeO 3 multiferroic ceramics prepared by sol–gel and spark plasma sintering techniques

Cited by 32 publications

References 37 publications

Spark plasma sintering of hydrothermally synthesized bismuth ferrite

Spark plasma sintering of hydrothermally synthesized bismuth ferrite

Processing and properties of Bi_0.98R_0.02FeO₃ (R = La, Sm, Y) ceramics flash sintered at ~650°C in <5 s

Effect of Preheating Temperature on Synthesis of Pure BiFeO3 via Sol–Gel Method

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Effect of annealing atmosphere on the structural and electrical properties of BiFeO 3 multiferroic ceramics prepared by sol–gel and spark plasma sintering techniques

Cited by 32 publications

References 37 publications

Spark plasma sintering of hydrothermally synthesized bismuth ferrite

Spark plasma sintering of hydrothermally synthesized bismuth ferrite

Processing and properties of Bi0.98R0.02FeO3 (R = La, Sm, Y) ceramics flash sintered at ~650°C in <5 s

Effect of Preheating Temperature on Synthesis of Pure BiFeO3 via Sol–Gel Method

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Processing and properties of Bi_0.98R_0.02FeO₃ (R = La, Sm, Y) ceramics flash sintered at ~650°C in <5 s