Quenching ilmenite with a high-temperature and high-pressure phase using super-high-energy ball milling

Hashishin, Takeshi; Tan, Zhenquan; Yamamoto, Kazuhiro; Qiu, Nan; Kim, Jungeum; Numako, Chiya; Naka, Takashi; Valmalette, Jean‐Christophe; Ohara, Satoshi

doi:10.1038/srep04700

Cited by 7 publications

(7 citation statements)

References 33 publications

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“…The high-energy collisions during ball milling can supply more energy than the heating during hot-pressing or powderquenching. 31 At the same time kinetic energies of the atoms during RF sputtering are comparably high (typically in the eV range 32 ). It is not unusual for thin lm alloys deposited at high kinetic energies to show extended single-phase boundaries.…”

Section: Discussionmentioning

confidence: 99%

Solubility limits in quaternary SnTe-based alloys

et al. 2017

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The controlled decomposition of metastable alloys is an attractive route to form nanostructured thermoelectric materials with reduced thermal conductivity. The ternary SnTe-MnTe and SnTe-SnSe heterostructural alloys have been demonstrated as promising materials for thermoelectric applications.In this work, the quaternary Sn 1Ày Mn y Te 1Àx Se x phase space serves as a relevant model system to explore how a combination of computational and combinatorial-growth methods can be used to study equilibrium and non-equilibrium solubility limits. Results from first principle calculations indicate low equilibrium solubility for x,y < 0.05 that are in good agreement with results obtained from bulk equilibrium synthesis experiments and predict significantly higher spinodal limits. An experimental screening using sputtered combinatorial thin film sample libraries showed a remarkable increase in nonequilibrium solubility for x,y > 0.2. These theoretical and experimental results were used to guide the bulk synthesis of metastable alloys. The ability to reproduce the non-equilibrium solubility levels in bulk materials indicates that such theoretical calculations and combinatorial growth can inform bulk synthetic routes. Further, the large difference between equilibrium and non-equilibrium solubility limits in Sn 1Ày Mn y Te 1Àx Se x indicates these metastable alloys are attractive in terms of nano-precipitate formation for potential thermoelectric applications.

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Section: Discussionmentioning

confidence: 99%

Solubility limits in quaternary SnTe-based alloys

et al. 2017

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“…The compressed IH solid solution was prepared by super-highenergy ball milling (8)(9)(10)(11). The 0.5FeTiO 3 •0.5Fe 2 O 3 solid solution sample shows a decrease in molar volume of approximately 1.8%, which corresponds to that of a single crystal of FeTiO 3 under a high pressure of 5 GPa at 300 K. Consequently, the oxidation state in FeTiO 3 changes to almost Fe 3+ Ti 3+ from Fe 2+ Ti 4+ , resulting in the emergence of ferromagnetism (fig.…”

Section: Ferromagnetism In Compressed Ih Solid Solutionmentioning

confidence: 99%

Ferromagnetism and exchange bias in compressed ilmenite-hematite solid solution as a source of planetary magnetic anomalies

2022

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We propose a compressed ilmenite-hematite solid solution as a new potential source of Earth’s magnetic anomalies. The 0.5FeTiO 3 ·0.5Fe 2 O 3 solid solution compressed by collision synthesis with super-high-energy ball milling showed a decrease in molar volume of approximately 1.8%. Consequently, the sample showed a saturation magnetization of 1.5 ampere square meter per kilogram (Am 2 /kg) at 300 kelvin, a Curie temperature of 990 kelvin, and a magnetic exchange bias below 100 kelvin, e.g., 1.7 × 10 5 ampere per meter at 60 kelvin. Ilmenite-hematite solid solutions are common mineral systems in most mafic igneous and metamorphic rocks, and the compressive force in the rocks is generated by the high pressure in the upper mantle or by shock events with high pressure such as the collision of these rocks with meteorites. Therefore, we consider that the compressed ilmenite-hematite solid solution is an additional candidate source of other planetary magnetic anomalies including those in the Moon and Earth.

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“…In a previous study, we reported that the lattice for trigonal FeTiO 3 powder can be compressed by the high collision energy of 150 gravity using super-high-energy ball milling 6 , whereas little lattice compression was found for FeTiO 3 using conventional high-energy ball milling 7 . This lattice compression is to be expected for the charge transfer in FeTiO 3 with high pressure.…”

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confidence: 94%

“…FeTiO 3 is a typical transition metal oxide where the partially occupied d shells of the cations allow for a range of charge and spin states. Two types of cation charge ordering exist consistent with O 2− anions, namely, Fe 2+ Ti 4+ and Fe 3+ Ti 3+ , in which Fe has d-electron configurations of d 6 and d 5 , respectively. The charge transfer excitation between these two oxidation states is known and has been observed in a number of Fe-and Ti-bearing minerals 4 .…”

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confidence: 99%

Emergence of ferromagnetism due to charge transfer in compressed ilmenite powder using super-high-energy ball milling

Ohara

Naka

Sunakawa

et al. 2020

Sci Rep

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Powder x-ray diffraction patterns were measured for the samples filled inside a capillary with an inner diameter of 200 μm using a synchrotron x-ray source (λ = 0.65296 Å) in the BL15XU beam line at SPring-8, Harima, Japan 30. SeM-eDS measurements. A small piece of the produced powder was suspended in ethanol by ultrasonication until a homogeneous suspension was obtained. The suspension was dropped onto an aluminium sample holder, dried, and examined by scanning electron microscopy (SEM) with electron dispersion spectroscopy (EDS) operated at 15 kV (JSM-7600F, JEOL). Mössbauer measurements. We measured the 57 Fe Mössbauer spectra using the constant acceleration method, using a 57 Co(Rh) source and an α-Fe a reference. γ-Ray radiation was monitored with a multi-channel analyser (MCA-7700, Seiko EG&G) using 512 channels for each spectrum. The obtained spectra were analysed by Lorentzian fitting using Mösswinn 3.0i XP. Magnetic measurements. We measured the magnetic properties using a conventional superconducting quantum interference device (SQUID) magnetometer (MPMS-XL, Quantum Design) under a magnetic field of up to 50 kOe in the temperature range from 5 to 300 K for dc-magnetization.

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Quenching ilmenite with a high-temperature and high-pressure phase using super-high-energy ball milling

Cited by 7 publications

References 33 publications

Solubility limits in quaternary SnTe-based alloys

Solubility limits in quaternary SnTe-based alloys

Ferromagnetism and exchange bias in compressed ilmenite-hematite solid solution as a source of planetary magnetic anomalies

Emergence of ferromagnetism due to charge transfer in compressed ilmenite powder using super-high-energy ball milling

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