Mössbauer Study of the Structure and Decomposition of Wustite

Shechter, H.; Hillman, P.; Ron, M.

doi:10.1063/1.1703160

Cited by 31 publications

(17 citation statements)

References 5 publications

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“…This is consistent with the reported decomposition of wüstite. 42 The magnetite crystals present in the iron oxide cores have a cubic phase with cell parameters a = c = 8.3969 Å and space group Fd

\overset{3}{true}

m (227) (JCPDS card no. 98-000-0294).…”

Section: Resultsmentioning

confidence: 99%

Magnetic−Plasmonic Core−Shell Nanoparticles

Levin¹,

Hofmann²,

et al. 2009

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Nanoparticles composed of magnetic cores with continuous Au shell layers simultaneously possess both magnetic and plasmonic properties. Faceted and tetracubic nanocrystals consisting of wüstite with magnetite-rich corners and edges retain magnetic properties when coated with an Au shell layer, with the composite nanostructures showing ferrimagnetic behavior. The plasmonic properties are profoundly influenced by the high dielectric constant of the mixed-iron-oxide nanocrystalline core. A comprehensive theoretical analysis that examines the geometric plasmon tunability over a range of core permittivities enables us to identify the dielectric properties of the mixed-oxide magnetic core directly from the plasmonic behavior of the core-shell nanoparticle.

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\overset{3}{true}

m (227) (JCPDS card no. 98-000-0294).…”

Section: Resultsmentioning

confidence: 99%

Magnetic−Plasmonic Core−Shell Nanoparticles

Levin¹,

Hofmann²,

et al. 2009

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“…However, this trend changes at a temperature of around 823 K (550°C), which is probably related both to the ''Curie point'' effect, where Fe 3 O 4 loses magnetism, and to the reproduction of Fe 0.925 O. [16] Thus, the thermal decomposition of Fe 0.925 O hinders the determination of the dielectric and magnetic properties of ''true'' Fe 0.925 O from~473 K to~823 K (~200°C to~550°C) . At the temperature higher than 823 K (550°C), however, this ''disturbance'' can be excluded due to the regeneration of nonstoichiometric ferrous oxide.…”

Section: Resultsmentioning

confidence: 94%

“…This observation is in agreement with previous research, which shows that the ferrous oxide is thermodynamically unstable below 848 K (575°C), dissociating to metal and Fe 3 O 4 . [12,13,16] According to this investigation, the reaction can be expressed as follows:…”

Section: Resultsmentioning

confidence: 99%

Microwave Absorption Characteristics of Conventionally Heated Nonstoichiometric Ferrous Oxide

Peng

Hwang

Mouris

et al. 2011

Metall Mater Trans A

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The temperature dependence of the microwave absorption of conventionally heated nonstoichiometric ferrous oxide (Fe 0.925 O) was characterized via the cavity perturbation technique between 294 K and 1373 K (21°C and 1100°C). The complex relative permittivity and permeability of the heated Fe 0.925 O sample slightly change with temperature from 294 K to 473 K (21°C to 200°C). The dramatic variations of permittivity and permeability of the sample from 473 K to 823 K (200°C to 550°C) are partially attributed to the formation of magnetite (Fe 3 O 4 ) and metal iron (Fe) from the thermal decomposition of Fe 0.925 O, as confirmed by the high-temperature X-ray diffraction (HT-XRD). At higher temperatures up to 1373 K (1100°C), it is found that Fe 0.925 O regenerates and remains as a stable phase with high permittivity. Since the permittivity dominates the microwave absorption of Fe 0.925 O above 823 K (550°C), resulting in shallow microwave penetration depth (~0.11 and~0.015 m at 915 and 2450 MHz, respectively), the regenerated nonstoichiometric ferrous oxide exhibits useful microwave absorption capability in the temperature range of 823 K to1373 K (550°C to 1100°C).

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“…Mössbauer data obtained at lower temperatures ͑not shown͒ exhibited the Fe 1Ϫx O Néel transition near 200 K, as expected. 8 The unusual cyclic magnetic behavior is therefore due to the metastable nature of Fe 1Ϫx O. This material is stable only above 570°C, but is metastable below about 200°C.…”

Section: Resultsmentioning

confidence: 99%

Unusual magnetic behavior in Nd–Fe–B alloy powder compacts

Wei

Parker

Putris

et al. 1996

Journal of Applied Physics

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We report an unusual magnetic behavior in powders prepared by spark-eroding ͑in liquid Ar͒ alloy electrodes containing approximately equal weights of Fe and Nd 2 Fe 14 B in an effort to prepare composite permanent magnets. Magnetization exhibits reproducible thermal hysteresis, peaking in all applied fields near 520°C when warming, but increasing monotonically when cooling to room temperature from 700°C and above. Mössbauer spectroscopy was used to show that the behavior is due to the metastability of Fe 1Ϫx O produced in the powders by partial oxidation in Ar gas flow. This compound, paramagnetic at room temperature, decomposes only slowly below 570°C into ferromagnetic Fe and ferrimagnetic Fe 3 O 4 . The reverse reaction occurs readily at higher temperatures.

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Mössbauer Study of the Structure and Decomposition of Wustite

Cited by 31 publications

References 5 publications

Magnetic−Plasmonic Core−Shell Nanoparticles

Magnetic−Plasmonic Core−Shell Nanoparticles

Microwave Absorption Characteristics of Conventionally Heated Nonstoichiometric Ferrous Oxide

Unusual magnetic behavior in Nd–Fe–B alloy powder compacts

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