Biferroic electro – acoustic ceramics with $\mbox{\sffamily\bfseries BiFeO}_{\hbox{\sffamily\bfseries\fontsize{12}{12}\selectfont 3}}$ composition

Rymarczyk, J.; Machura, D.; Ilczuk, J.

doi:10.1140/epjst/e2008-00543-0

Cited by 4 publications

(2 citation statements)

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“…185 8C. [94,95] While the coincidence of our resistive anomaly with Polomska's (whose impedance and dilatometry measurements were in a completely different set of samples) is tantalizing, at this point the evidence for and against an intrinsic origin seems to be split down the middle, so this possible transition certainly merits further careful studies in order to unambiguously establish its nature.…”

Section: Phase Transitions With Pressure or With La Dopingmentioning

confidence: 51%

Physics and Applications of Bismuth Ferrite

2009

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BiFeO3 is perhaps the only material that is both magnetic and a strong ferroelectric at room temperature. As a result, it has had an impact on the field of multiferroics that is comparable to that of yttrium barium copper oxide (YBCO) on superconductors, with hundreds of publications devoted to it in the past few years. In this Review, we try to summarize both the basic physics and unresolved aspects of BiFeO3 (which are still being discovered with several new phase transitions reported in the past few months) and device applications, which center on spintronics and memory devices that can be addressed both electrically and magnetically.

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Section: Phase Transitions With Pressure or With La Dopingmentioning

confidence: 51%

Physics and Applications of Bismuth Ferrite

2009

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“…To obtain ceramic bodies of BiFeO 3 or materials based on BiFeO 3 the conventional (isothermal) sintering process is widely-used [27,60,61]. Because of the low stability of nano BiFeO 3 at elevated temperatures, both the kinetics of the decomposition process and the densification during sintering were investigated.…”

Section: Phase Stability and Densification During Sinteringmentioning

confidence: 99%

Synthesis, phase evolution and properties of phase-pure nanocrystalline BiFeO3 prepared by a starch-based combustion method

Köferstein

2014

Journal of Alloys and Compounds

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The preparation of phase-pure nano-sized BiFeO 3 by a combustion-like method using starch as complexing agent is described herein. Phase evolution and development of the crystallite size during the synthesis were monitored depending on the heat treatment and the composition of the (BiFe)-gels. Phase-pure BiFeO 3 was obtained at a low heating rate and calcination temperatures between 500 and 600 °C. Above 600 °C the BiFeO 3 gradually decomposed to Bi 25 FeO 40 and Bi 2 Fe 4 O 9. The investigations showed that the appearance of secondary phases depends on the heating rate, calcination temperature, and the fuel to oxidizer ratio in the (BiFe)-gel. The use of HNO 3 instead of acetic acid in the preparation of 2 the (BiFe)-gel promotes the formation of secondary phases. To study the phase stability the phase-pure BiFeO 3 powder (1c) obtained after calcining at 550 °C (d cryst = 37 nm) was sintered to ceramic bodies up to 800 °C. During sintering the BiFeO 3 phase decomposed to Bi 25 FeO 40 and Bi 2 Fe 4 O 9 gradually. The activation energy for the decomposition process during sintering was calculated to 337±19 kJ/mol using the Johnson-Mehl-Avrami-Kolmogorov (JMAK) model. Magnetic measurements on phase-pure BiFeO 3 powders show maximal magnetization of about 0.7 emu/g at 90 kOe and coercivities between 5−7 kOe at 300 K. Investigations at 10 K reveal a loop shift (exchange-bias) up to 2.9 kOe in the negative direction. The optical band gaps of the phase-pure BiFeO 3 powders were determined as 2.28(4) eV.

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