Development of system and technology for mössbauer spectroscopic microscope

Hayakawa, Kazuo; Akiyama, Yuki; Tsukamoto, Yoshinori; Kurata, Mikio; Yukihira, Kenichi; Soejima, Hiroyoshi; Yoshida, Yutaka

doi:10.1007/s10751-011-0407-4

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…The paramagnetic components have often been reported in BFO bulk ceramics by many researchers, [24][25][26] and the components were considered to affect the electric properties at room temperature. To clarify the relation between the electric properties and the microstructures, we further measured the mapping images of the 57 Fe-enriched BFO and Bi 2 Fe 4 O 9 thin films separately using a Mössbauer spectroscopic microscope, 23,[27][28][29] which has been newly developed to obtain the 57 Fe microstructures. In this study, we have controlled the microstructure of 57 Fe-enriched BFO thin films by changing the sintering time in the CSD.…”

Section: Introductionmentioning

confidence: 99%

Mössbauer spectra and electric properties of⁵⁷Fe-enriched BiFeO₃thin films

Tanaka

Fujita

Okamura

et al. 2014

Jpn. J. Appl. Phys.

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Fe-enriched BiFeO 3 (BFO) thin films are fabricated on Pt/Ti/SiO 2 /Si substrates from a stoichiometric precursor solution by chemical solution deposition process. The microstructure of the thin films is controlled by a changing the sintering time at 550 °C. The polycrystalline thin film fabricated at 550 °C for 5 min shows well-saturated polarization-electric field (P-E) hysteresis loops and the remnant polarization P r and coercive field E c at room temperature are 52 µC/cm 2 and 365 kV/cm, respectively, at an applied electric field of 1200 kV/cm. The Mössbauer spectra show that the BFO thin film has the valence state of Fe 3+ only, consisting of antiferromagnetic and paramagnetic components. The paramagnetic component with an area fraction from 11 to 18%, which is not amorphous or Bi 2 Fe 4 O 9 , seems to distribute in the surface shell of the grains and the grain boundaries. This component must strongly influence the ferroelectric properties at room temperature.

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Section: Introductionmentioning

confidence: 99%

Mössbauer spectra and electric properties of⁵⁷Fe-enriched BiFeO₃thin films

Tanaka

Fujita

Okamura

et al. 2014

Jpn. J. Appl. Phys.

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“…The details were described in our previous papers. [27][28][29] This microscope provides a possibility to not only observe the 57 Fe concentration profile, but also determine the distributions of each Mo ¨ssbauer component selectively.…”

Section: Methodsmentioning

confidence: 99%

Observation of ⁵⁷Fe-Enriched BiFeO₃ Thin Films Using Mössbauer Spectroscopic Microscope

Tanaka

Tsukamoto

Okamura

et al. 2013

Jpn. J. Appl. Phys.

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57Fe-enriched BiFeO3 (BFO) thin films were produced from a stoichiometric precursor solution by chemical solution deposition process. The perovskite BFO thin film fabricated at 550 °C on a Pt/Ti/SiO2/Si substrate showed saturated polarization–electric field (P–E) hysteresis loops. The remanent polarization P r and the coercive field E c at room temperature were 89 µC/cm2 and 365 kV/cm, respectively. The Mössbauer spectra consisted of the antiferromagnetic perovskite BFO and a paramagnetic component at a fraction in the range of 11 to 14%. The secondary component was supposed to be due to Bi2Fe4O9 and/or an amorphous component, influencing the ferroelectric property at room temperature. The Bi2Fe4O9 thin film was also fabricated at 700 °C on a SiO2/Si substrate. Furthermore, we tried to measure the mapping images corresponding to the perovskite BFO and Bi2Fe4O9 components separately using a Mössbauer spectroscopic microscope. A mapping image showed the distribution of the perovskite BFO component on the film.

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