Bi3.25La0.75Ti2.5Nb0.25(Fe0.5Co0.5)0.25O12, a single phase room temperature multiferroic

Li, Zheng; Tao, Kun; Ma, Jing; Gao, Zhipeng; Kovaľ, Vladimír; Jiang, Changjun; Viola, Giuseppe; Zhang, Hangfeng; Mahajan, Amit; Cao, Jun; Cain, Markys G.; Abrahams, Isaac; Nan, Ce‐Wen; Jia, Chenglong; Yan, Haixue

doi:10.1039/c8tc00161h

Cited by 21 publications

(9 citation statements)

References 43 publications

(42 reference statements)

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“…6,36,46,47,48 However, the intrinsic multiferroicity in the co-doped Aurivillius materials is still under debate due to the possible formation of magnetically-active secondary phases. 30,49 According to our very recent study 50 , Fe/Co co-substitution can induce intrinsic multiferroic properties in the three-layer Bi3.25La0.75Ti3O12 Aurivillius-type ceramics at and above room temperature. Based on these findings and aiming at introducing a magnetic long-range order in the four-layer BFTO-derived Aurivillius compounds, we have lately upgraded our Gd-BFTO system by the B-site Co co-substitution; its electronic and crystal structure alongside with the multiferroic properties are currently being investigated.…”

Section: Magnetic Propertiesmentioning

confidence: 95%

Crystal Chemistry and Magnetic Properties of Gd-Substituted Aurivillius-Type Bi₅FeTi₃O₁₅ Ceramics

et al. 2018

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Aurivillius-phase ferroelectrics can be turned into multiferroic materials by incorporating magnetic ions. The four-layer Aurivillius-type system Bi5FeTi3O15 is well known to show a strong magnetoelectric effect; however, much controversy exists on its magnetic state and the possible multiferroicity at room temperature. In this paper, we report a detailed investigation on the interconnections between crystal chemistry and magnetic properties of Bi5FeTi3O15 ceramics chemically modified by the A-site gadolinium substitution. The structural studies showed that all Bi5-xGdxFeTi3O15 (0  x  1) samples adopt the polar orthorhombic space group symmetry A21am at room temperature. The unit cell volume and the orthorhombic distortion decrease alongside the reduction of octahedral tilts by increasing the amount of Gd added. The decrease in tilting distortion of the [Ti/Fe]O6 octahedra was further evidenced by the suppression of the Raman A1[111] tilt mode at 233 cm-1. By using superconducting quantum interference and vibrating sample magnetometry, it was demonstrated that all the ceramics are paramagnetic from 5 K up to 700 K. It was thus concluded that the A-site substitution of Bi5FeTi3O15 with magnetic Gd ions brings about a slight structural relaxation of the parental orthorhombic lattice, but it is not an effective way to induce multiferroic properties in the Aurivillius compound. We suggest that the roomtemperature (ferri/ferro/antiferro-) magnetism in Bi5FeTi3O15 previously reported in the literature might be due to the presence of magnetic impurities or local short-range magnetic ordering formed during material processing under different conditions.

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Section: Magnetic Propertiesmentioning

confidence: 95%

Crystal Chemistry and Magnetic Properties of Gd-Substituted Aurivillius-Type Bi₅FeTi₃O₁₅ Ceramics

et al. 2018

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“…It is universally acknowledged that BiFeO 3 is still the only single‐phase room‐temperature multiferroic material. Recently, magnetoelectric coupling were obviously observed in Bi 3.25 La 0.75 Ti 2.5 Nb 0.25 (Fe 0.5 Co 0.5 ) 0.25 O 12 ceramic by Li et al via composition modification . In recent years, significant attention has been paid to the study of the hybrid improper ferroelectricity (HIF).…”

Section: Introductionmentioning

confidence: 99%

Polarization switching dynamics and switchable diode effect in hybrid improper ferroelectric Ca₃Ti₂O₇ ceramics

et al. 2018

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Hybrid improper ferroelectric Ca3Ti2O7 (CTO) ceramics were synthesized by a solid‐state reaction method. Their polarization switching currents, dynamic processes of polarization‐switching, and leakage current properties were investigated. It was found that the dynamic polarization curves of CTO ceramics exhibit obvious dependence on the frequency of the driving electric fields. Moreover, CTO ceramics show a switchable diode effect. The underlying mechanism for the observed effects were proposed based on the interplaying between mobile charged defects and bound charges. The charged defects also lead to a decrease in the band gap of the CTO ceramic, as revealed by absorption spectrum analysis.

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“…All the peaks were indexed to an orthorhombic structure with a B2cb space group characteristic of five-layered Aurivillius phase compounds, and simultaneously to another orthorhombic phase with a crystallographic symmetry of an A2 1 am space group, typical of fourlayered Aurivillius oxides. 19,20 The lattice parameters of the orthorhombic B2cb structures a ¼ 5.4530(2) Å , b ¼ 5.4427(1) Å , and c ¼ 50.670(2) Å and the four-layered A2 1 am phases a ¼ 5.4651(6) Å , b ¼ 5.3943(6) Å , and c ¼ 41.487(2) Å were obtained by the full pattern matching method using the FullProf software package (http:// www.ill.eu).…”

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Room-temperature multiferroic behavior in layer-structured Aurivillius phase ceramics

Kovaľ

Mahajan

et al. 2020

Applied Physics Letters

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Multiferroics that simultaneously exhibit ferroelectricity and ferromagnetism have recently attracted great attention due to their potential application in next generation electronic devices. However, only a few single-phase multiferroic materials exhibit ferroelectric and ferromagnetic orders at room temperature. Recently, some bismuth layer-structured Aurivillius compounds were reported as multiferroics at room temperature, but the origin of their magnetic property is still under debate because the net magnetization may originate from the presence of secondary phases that are not easily detected by laboratory XRD diffractometers. Here, textured Aurivillius phase Bi 5.25 La 0.75 FeCoTi 3 O 18 ceramics were prepared by Spark Plasma Sintering. The ferromagnetic character of the ceramics was indicated by the magnetic field-induced reversible intensity changes of a certain set of crystalline planes belonging to the Aurivillius phase, as measured by in situ neutron diffraction under the applied magnetic field. The first principles calculations indicate that the ferromagnetism originates from double exchange interactions Fe 3þ -O-Fe 3þ , Co 3þ -O-Co 3þ , and Fe 3þ -O-Co 3þ in the ferro-toroidal main phase. The magnetic-controlled ferroelectric domain switching was observed by piezoelectric force microscopy at room temperature. The prepared Aurivillius phase ceramics, with Co/Fe contributing to magnetization and polarization at the same time, can be considered an intrinsic room-temperature multiferroic.

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Bi_3.25La_0.75Ti_2.5Nb_0.25(Fe_0.5Co_0.5)_0.25O₁₂, a single phase room temperature multiferroic

Abstract: A new single phase Aurivillius structured ceramic shows room temperature multiferroic behavior.

Cited by 21 publications

References 43 publications

Crystal Chemistry and Magnetic Properties of Gd-Substituted Aurivillius-Type Bi₅FeTi₃O₁₅ Ceramics

Crystal Chemistry and Magnetic Properties of Gd-Substituted Aurivillius-Type Bi₅FeTi₃O₁₅ Ceramics

Polarization switching dynamics and switchable diode effect in hybrid improper ferroelectric Ca₃Ti₂O₇ ceramics

Room-temperature multiferroic behavior in layer-structured Aurivillius phase ceramics

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Bi3.25La0.75Ti2.5Nb0.25(Fe0.5Co0.5)0.25O12, a single phase room temperature multiferroic

Abstract: A new single phase Aurivillius structured ceramic shows room temperature multiferroic behavior.

Cited by 21 publications

References 43 publications

Crystal Chemistry and Magnetic Properties of Gd-Substituted Aurivillius-Type Bi5FeTi3O15 Ceramics

Crystal Chemistry and Magnetic Properties of Gd-Substituted Aurivillius-Type Bi5FeTi3O15 Ceramics

Polarization switching dynamics and switchable diode effect in hybrid improper ferroelectric Ca3Ti2O7 ceramics

Room-temperature multiferroic behavior in layer-structured Aurivillius phase ceramics

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Bi_3.25La_0.75Ti_2.5Nb_0.25(Fe_0.5Co_0.5)_0.25O₁₂, a single phase room temperature multiferroic

Crystal Chemistry and Magnetic Properties of Gd-Substituted Aurivillius-Type Bi₅FeTi₃O₁₅ Ceramics

Crystal Chemistry and Magnetic Properties of Gd-Substituted Aurivillius-Type Bi₅FeTi₃O₁₅ Ceramics

Polarization switching dynamics and switchable diode effect in hybrid improper ferroelectric Ca₃Ti₂O₇ ceramics