High magnetic ordering temperature in the perovskites Sr4−La Fe3ReO12 (x=0.0, 1.0, 2.0)

Retuerto, M.; Li, Man-Rong; Go, Yong Bok; Ignatov, Alexander; Croft, Mark; Ramanujachary, K. V.; Herber, Rolfe H.; Nowik, I.; Hodges, J. P.; Dachraoui, Walid; Hadermann, Joke; Greenblatt, Martha

doi:10.1016/j.jssc.2012.06.031

Cited by 11 publications

(26 citation statements)

References 55 publications

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“…Multiple HR-SEM-EDX surface scans (areas ranging from 900 lm 2 to 1 mm 2 ) showed an average film composition of Bi 6 A, that closely corresponds to that of a rock salt structure. 76 76,77 It should be noted that this rock salt-structured composition is nonferromagnetic, and antiferromagnetic at low temperatures with a N eel point of~150 K. 77 The electron-diffraction pattern captured for the Mn 0.53 Fe 0.47 O inclusions fits simulations of this space group along the (110) direction perfectly 78 assuming micro/nanotwinning 79,80 causes reflections at half positions. This assumption is strengthened by the observations in TEM dark field mode (Fig.…”

Section: Resultsmentioning

confidence: 86%

Magnetic Field‐Induced Ferroelectric Switching in Multiferroic Aurivillius Phase Thin Films at Room Temperature

et al. 2013

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Single-phase multiferroic materials are of considerable interest for future memory and sensing applications. Thin films of Aurivillius phase Bi7Ti3Fe3O21 and Bi6Ti2.8Fe1.52Mn0.68O18 (possessing six and five perovskite units per half-cell, respectively) have been prepared by chemical solution deposition on c-plane sapphire. Superconducting quantum interference device magnetometry reveal Bi7Ti3Fe3O21 to be antiferromagnetic (TN = 190 K) and weakly ferromagnetic below 35 K, however, Bi6Ti2.8Fe1.52Mn0.68O18 gives a distinct room-temperature in-plane ferromagnetic signature (Ms = 0.74 emu/g, μ0Hc =7 mT). Microstructural analysis, coupled with the use of a statistical analysis of the data, allows us to conclude that ferromagnetism does not originate from second phase inclusions, with a confidence level of 99.5%. Piezoresponse force microscopy (PFM) demonstrates room-temperature ferroelectricity in both films, whereas PFM observations on Bi6Ti2.8Fe1.52Mn0.68O18 show Aurivillius grains undergo ferroelectric domain polarization switching induced by an applied magnetic field. Here, we show for the first time that Bi6Ti2.8Fe1.52Mn0.68O18 thin films are both ferroelectric and ferromagnetic and, demonstrate magnetic field-induced switching of ferroelectric polarization in individual Aurivillius phase grains at room temperature

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Section: Resultsmentioning

confidence: 86%

Magnetic Field‐Induced Ferroelectric Switching in Multiferroic Aurivillius Phase Thin Films at Room Temperature

et al. 2013

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“…In the data collection, both transmission mode and fluorescent measurements were made with simultaneous standards for precision energy calibration. Standard linear background and postedge normalization to unity absorption step height were used in the analysis. − …”

Section: Experimental Sectionmentioning

confidence: 99%

Tl₂Ir₂O₇: A Pauli Paramagnetic Metal, Proximal to a Metal Insulator Transition

et al. 2021

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A polycrystalline sample of Tl 2 Ir 2 O 7 was synthesized by high-pressure and high-temperature methods. Tl 2 Ir 2 O 7 crystallizes in the cubic pyrochlore structure with space group Fd3̅ m (No. 227). The Ir 4+ oxidation state is confirmed by Ir−L 3 Xray absorption near-edge spectroscopy. Combined temperaturedependent magnetic susceptibility, resistivity, specific heat, and DFT+DMFT calculation data show that Tl 2 Ir 2 O 7 is a Pauli paramagnetic metal, but it is close to a metal−insulator transition. The effective ionic size of Tl 3+ is much smaller than that of Pr 3+ in metallic Pr 2 Ir 2 O 7 ; hence, Tl 2 Ir 2 O 7 would be expected to be insulating according to the established phase diagram of the pyrochlore iridate compounds, A 3+ 2 Ir 4+ 2 O 7 . Our experimental and theoretical studies indicate that Tl 2 Ir 2 O 7 is uniquely different from the current A 3+2 Ir 4+ 2 O 7 phase diagram. This uniqueness is attributed primarily to the electronic configuration difference between Tl 3+ and rare-earth ions, which plays a substantial role in determining the Ir−O−Ir bond angle, and the corresponding electrical and magnetic properties.

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“…A particularly successful strategy is the introduction of a small fraction of highly charged cations at the Co sublattice in order to destabilize the columns of CoO 6 octahedra sharing faces that constitute the competitive 2H polytype. Following previous investigations on SrCo 1−x M x O 3− δ (M = Sb, Mo, Nb, V, Ti) [13,14,15,16], in this work we have successfully explored the introduction of M = Re 6+ at the Co site, since Re is well known to occupy the octahedral positions in many perovskite-related compounds [17,18,19]. …”

Section: Introductionmentioning

confidence: 99%

New Rhenium-Doped SrCo1−xRexO3−δ Perovskites Performing as Cathodes in Solid Oxide Fuel Cells

2016

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In the aim to stabilize novel three-dimensional perovskite oxides based upon SrCoO3−δ, we have designed and prepared SrCo1−xRexO3−δ phases (x = 0.05 and 0.10), successfully avoiding the competitive hexagonal 2H polytypes. Their performance as cathode materials in intermediate-temperature solid oxide fuel cells (IT-SOFC) has been investigated. The characterization of these oxides included X-ray (XRD) and in situ temperature-dependent neutron powder diffraction (NPD) experiments for x = 0.10. At room temperature, SrCo1−xRexO3−δ perovskites are defined in the P4/mmm space group, which corresponds to a subtle tetragonal perovskite superstructure with unit-cell parameters a = b ≈ ao, c = 2ao (ao = 3.861 and 3.868 Å, for x = 0.05 and 0.10, respectively). The crystal structure evolves above 380 °C to a simple cubic perovskite unit cell, as observed from in-situ NPD data. The electrical conductivity gave maximum values of 43.5 S·cm−1 and 51.6 S·cm−1 for x = 0.05 and x = 0.10, respectively, at 850 °C. The area specific resistance (ASR) polarization resistance determined in symmetrical cells is as low as 0.087 Ω·cm2 and 0.065 Ω·cm2 for x = 0.05 and x = 0.10, respectively, at 850 °C. In single test cells these materials generated a maximum power of around 0.6 W/cm2 at 850 °C with pure H2 as a fuel, in an electrolyte-supported configuration with La0.8Sr0.2Ga0.83Mg0.17O3−δ (LSGM) as the electrolyte. Therefore, we propose the SrCo1−xRexO3−δ (x = 0.10 and 0.05) perovskite oxides as promising candidates for cathodes in IT-SOFC.

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High magnetic ordering temperature in the perovskites Sr4−La Fe3ReO12 (x=0.0, 1.0, 2.0)

Cited by 11 publications

References 55 publications

Magnetic Field‐Induced Ferroelectric Switching in Multiferroic Aurivillius Phase Thin Films at Room Temperature

Magnetic Field‐Induced Ferroelectric Switching in Multiferroic Aurivillius Phase Thin Films at Room Temperature

Tl₂Ir₂O₇: A Pauli Paramagnetic Metal, Proximal to a Metal Insulator Transition

New Rhenium-Doped SrCo1−xRexO3−δ Perovskites Performing as Cathodes in Solid Oxide Fuel Cells

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High magnetic ordering temperature in the perovskites Sr4−La Fe3ReO12 (x=0.0, 1.0, 2.0)

Cited by 11 publications

References 55 publications

Magnetic Field‐Induced Ferroelectric Switching in Multiferroic Aurivillius Phase Thin Films at Room Temperature

Magnetic Field‐Induced Ferroelectric Switching in Multiferroic Aurivillius Phase Thin Films at Room Temperature

Tl2Ir2O7: A Pauli Paramagnetic Metal, Proximal to a Metal Insulator Transition

New Rhenium-Doped SrCo1−xRexO3−δ Perovskites Performing as Cathodes in Solid Oxide Fuel Cells

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Tl₂Ir₂O₇: A Pauli Paramagnetic Metal, Proximal to a Metal Insulator Transition