Structural Studies and Order–Disorder Phenomenon in a Series of New Quaternary Tellurates of the Type A2+M4+Te6+O6 and A1+2M4+Te6+O6

et al. 2015

Advanced Materials

Mn(2+)2 Fe(2+)W(6+)O6 , a new polar magnetic phase, adopts the corundum-derived Ni3TeO6 -type structure with large spontaneous polarization (PS) of 67.8 μC cm(-2), complex antiferromagnetic order below ≈75 K, and field-induced first-order transition to a ferrimagnetic phase below ≈30 K. First-principles calculations predict a ferrimagnetic (udu) ground state, optimal switching path along the c-axis, and transition to a lower energy udu-udd magnetic double cell.

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confidence: 98%

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confidence: 99%

Mn₂FeWO₆: A New Ni₃TeO₆‐Type Polar and Magnetic Oxide

Croft

et al. 2015

Advanced Materials

“…The structural features of corundum derivatives provide an ideal platform for designing polar and magnetic compounds, since magnetic ions can be incorporated into both the octahedral A - and B -sites to lead to strong magnetic interactions, accompanied by large spontaneous polarization ( P S ) if the polar LiNbO 3 (LN, R 3 c ), ordered ilmenite (OIL, R 3), or Ni 3 TeO 6 (NTO, R 3) type structure is adopted 1–14 . Remarkable physical properties, such as multiferroic, piezoelectric, pyroelectric and second harmonic generation (SHG) effect, have been demonstrated in these materials.…”

Section: Introductionmentioning

confidence: 99%

Magnetostriction-polarization coupling in multiferroic Mn2MnWO6

McCabe

et al. 2017

Nat Commun

Double corundum-related polar magnets are promising materials for multiferroic and magnetoelectric applications in spintronics. However, their design and synthesis is a challenge, and magnetoelectric coupling has only been observed in Ni3TeO6 among the known double corundum compounds to date. Here we address the high-pressure synthesis of a new polar and antiferromagnetic corundum derivative Mn2MnWO6, which adopts the Ni3TeO6-type structure with low temperature first-order field-induced metamagnetic phase transitions (T N = 58 K) and high spontaneous polarization (~ 63.3 μC·cm−2). The magnetostriction-polarization coupling in Mn2MnWO6 is evidenced by second harmonic generation effect, and corroborated by magnetic-field-dependent pyroresponse behavior, which together with the magnetic-field-dependent polarization and dielectric measurements, qualitatively indicate magnetoelectric coupling. Piezoresponse force microscopy imaging and spectroscopy studies on Mn2MnWO6 show switchable polarization, which motivates further exploration on magnetoelectric effect in single crystal/thin film specimens.

“…[5,[8][9][10][11] Cationic rearrangements below 300 8 8Ch ave only been reported in nanocrystals, [12][13][14] or when driven by applied external electrical potential as in battery materials, [15,16] but not in bulk metal oxides by temperature alone.T he corundum-derived A 2 BB'O 6 family of compounds can incorporate transition metal ions at all of the cationic sites and adopt different cation order-disorder configurations,providing an ideal platform for materials engineering. [5,8,9,[17][18][19][20][21][22] Recently,t he polar roomtemperature (T C % 337 K) ferrimagnet Mn 2 FeMoO 6 ,h ereafter called phase I, was prepared by quenching to room temperature from 1350 8 8Ca tapressure of 8GPa. [21] Firstprinciples calculations indicated that the band gap,t he magnetic and electronic properties,a nd the ground-state energy of Mn 2 FeMoO 6 are governed by the arrangement of cations in the unit cell, which suggested effective property control through cationic arrangement.…”

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confidence: 99%

Low‐Temperature Cationic Rearrangement in a Bulk Metal Oxide

Retuerto

et al. 2016

Angew Chem Int Ed

Cationic rearrangement is a compelling strategy for producing desirable physical properties by atomic-scale manipulation. However, activating ionic diffusion typically requires high temperature, and in some cases also high pressure in bulk oxide materials. Herein, we present the cationic rearrangement in bulk Mn2 FeMoO6 at unparalleled low temperatures of 150-300 (o) C. The irreversible ionic motion at ambient pressure, as evidenced by real-time powder synchrotron X-ray and neutron diffraction, and second harmonic generation, leads to a transition from a Ni3 TeO6 -type to an ordered-ilmenite structure, and dramatic changes of the electrical and magnetic properties. This work demonstrates a remarkable cationic rearrangement, with corresponding large changes in the physical properties in a bulk oxide at unprecedented low temperatures.