Kinetics of tetrataenite disordering

Santos, E. Dos; Gattacceca, J.; Rochette, P.; Fillion, G.; Scorzelli, R. B.

doi:10.1016/j.jmmm.2014.09.051

Cited by 31 publications

(35 citation statements)

References 29 publications

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“…16, where Vicência and Guidder (a tetrataenite rich LL5) both display a very high coercivity peak around 500-600 mT that is absent in Krymka. We submitted Vicência to a thermal treatment at 475°C for 20 h to disorder tetrateanite (Dos Santos et al 2015). After tetrataenite disordering, Vicência displays a coercivity spectrum remarkably similar to the one of Krymka (Fig.…”

Section: Petrologic Typementioning

confidence: 83%

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The Vicência meteorite fall: A new unshocked (S1) weakly metamorphosed (3.2)LLchondrite

Keil

Zucolotto

Krot

et al. 2015

Meteorit & Planetary Scien

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The Vicência meteorite, a stone of 1.547 kg, fell on September 21, 2013, at the village Borracha, near the city of Vicência, Pernambuco, Brazil. It was recovered immediately after the fall, and our consortium study showed it to be an unshocked (S1) LL3.2 ordinary chondrite. The LL group classification is based on the bulk density (3.13 g cm À3 ); the chondrule mean apparent diameter (0.9 mm); the bulk oxygen isotopic composition (d 17 O = 3.768 AE 0.042&, d 18 O = 5.359 AE 0.042&, D 17 O = 0.981 AE 0.020&); the content of metallic Fe,Ni (1.8 vol%); the Co content of kamacite (1.73 wt%); the bulk contents of the siderophile elements Ir and Co versus Au; and the ratios of metallic Fe 0 /total iron (0.105) versus total Fe/Mg (1.164), and of Ni/ Mg (0.057) versus total Fe/Mg. The petrologic type 3.2 classification is indicated by the beautifully developed chondritic texture, the standard deviation (~0.09) versus mean Cr 2 O 3 content (~0.14 wt%) of ferroan olivine, the TL sensitivity and the peak temperature and peak width at half maximum, the cathodoluminescence properties of chondrules, the content of trapped 132 Xe tr (0.317 9 10 À8 cm 3 STP g À1 ), and the Raman spectra for organic material in the matrix. The cosmic ray exposure age is~72 Ma, which is at the upper end of the age distribution of LL group chondrites. The meteorite is unusual in that it contains relatively large, up to nearly 100 lm in size, secondary fayalite grains, defined as olivine with Fa >75 , large enough to allow in situ measurement of oxygen and Mn-Cr isotope systematics with SIMS. Its oxygen isotopes plot along a mass-dependent fractionation line with a slope of~0.5 and D 17 O of 4.0 AE 0.3&, and are similar to those of secondary fayalite and magnetite in the unequilibrated chondrites EET 90161, MET 96503, and Ngawi. These data suggest that secondary fayalite in Vicência was in equilibrium with a fluid with a D 17 O of~4&, consistent with the composition of the fluid in equilibrium with secondary magnetite and fayalite in other unequilibrated ordinary chondrites. Secondary fayalite and the chondrule olivine phenocrysts in Vicência are not in isotopic equilibrium, consistent with low-temperature formation of fayalite during aqueous alteration on the LL parent body. That alteration, as dated by the 53 Mn-53 Cr chronology age of secondary fayalite, took place 4:0 þ1:4 À1:1 Ma after formation of CV CAIs when anchored to the quenched angrite D'Orbigny.

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Section: Petrologic Typementioning

confidence: 83%

“…We submitted Vicência to a thermal treatment at 475 °C for 20 h to disorder tetrateanite (Dos Santos et al. ). After tetrataenite disordering, Vicência displays a coercivity spectrum remarkably similar to the one of Krymka (Fig.…”

Section: Discussionmentioning

confidence: 99%

The Vicência meteorite fall: A new unshocked (S1) weakly metamorphosed (3.2)LLchondrite

Keil

Zucolotto

Krot

et al. 2015

Meteorit & Planetary Scien

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“…Although comparison between hysteresis properties of heated bulk samples to unheated ones also constitute a good proxy for identification of tetrataenite signal, heating experiments will not be performed here. For complete description on heating experiments as well as the behavior of tetrataenite upon heating, see Dos Santos et al (2015).…”

Section: Samplesmentioning

confidence: 99%

“…A complication comes from the possible successive disordering of tetrataenite into taenite either by shock or by heating (Dos Santos et al, 2015). As a result, before discussing the initial thermal history of a meteorite it is necessary to analyze the effects of possible later shock and heating events on the ordering of tetrataenite.…”

Section: Irm and Dc-experiments: Discrimination Of Coercivity Componentsmentioning

confidence: 99%

“…As a result, before discussing the initial thermal history of a meteorite it is necessary to analyze the effects of possible later shock and heating events on the ordering of tetrataenite. The kinetics of tetrataenite disordering upon heating above 320°C are now rather well constrained (Dos Santos et al, 2015), but the effect of shock in the measured taenite quadrupole shift needs more discussion. Fig.…”

Section: Irm and Dc-experiments: Discrimination Of Coercivity Componentsmentioning

confidence: 99%

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Magnetic hysteresis properties and 57Fe Mössbauer spectroscopy of iron and stony-iron meteorites: Implications for mineralogy and thermal history

Santos

Gattacceca

Rochette

et al. 2015

Physics of the Earth and Planetary Interiors

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Accelerating Nature: Induced Atomic Order in Equiatomic FeNi

Lewis,

Stamenov

2023

Advanced Science

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The production of locally atomically ordered FeNi (known by its meteoric mineral name, tetrataenite) is confirmed in bulk samples by simultaneous conversion X‐ray and backscattered γ‐ray 57Fe Mössbauer spectroscopy. Up to 22 volume percent of the tetragonal tetrataenite phase is quantified in samples thermally treated under simultaneous magnetic‐ and stress‐field conditions for a period of 6 weeks, with the remainder identified as the cubic FeNi alloy. In contrast, all precursor samples consist only of the cubic FeNi alloy. Data from the processed alloys are validated using Mössbauer parameters derived from natural meteoritic tetrataenite. The meteoritic tetrataenite exhibits a substantially higher degree of atomic order than do the processed samples, consistent with their low uniaxial magnetocrystalline anisotropy energy of ≈1 kJ·m−3. These results suggest that targeted refinements to the processing conditions of FeNi will foster greater atomic order and increased magnetocrystalline anisotropy, leading to an enhanced magnetic energy product. These outcomes also suggest that deductions concerning paleomagnetic conditions of the solar system, as derived from meteoritic data, may warrant re‐examination and re‐evaluation. Additionally, this work strengthens the argument that tetrataenite may indeed become a member of the advanced permanent magnet portfolio, helping to meet rapidly escalating green energy imperatives.

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Kinetics of tetrataenite disordering

Cited by 31 publications

References 29 publications

The Vicência meteorite fall: A new unshocked (S1) weakly metamorphosed (3.2)LLchondrite

The Vicência meteorite fall: A new unshocked (S1) weakly metamorphosed (3.2)LLchondrite

Magnetic hysteresis properties and 57Fe Mössbauer spectroscopy of iron and stony-iron meteorites: Implications for mineralogy and thermal history

Accelerating Nature: Induced Atomic Order in Equiatomic FeNi

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