scholarly journals Progress and Perspectives on Aurivillius-Type Layered Ferroelectric Oxides in Binary Bi4Ti3O12-BiFeO3 System for Multifunctional Applications

Crystals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 23
Author(s):  
Shujie Sun ◽  
Xiaofeng Yin
Keyword(s):  
Room Temperature ◽  
Single Phase ◽  
Photovoltaic Effect ◽  
Magnetic Ordering ◽  
Layered Perovskite ◽  
Aurivillius Phase ◽  
Electro Magnetic ◽  
Further Development ◽  
Ferroelectric Oxides ◽  
Rich Spectrum

Driven by potentially photo-electro-magnetic functionality, Bi-containing Aurivillius-type oxides of binary Bi4Ti3O12-BiFeO3 system with a general formula of Bin+1Fen−3Ti3O3n+3, typically in a naturally layered perovskite-related structure, have attracted increasing research interest, especially in the last twenty years. Benefiting from highly structural tolerance and simultaneous electric dipole and magnetic ordering at room temperature, these Aurivillius-phase oxides as potentially single-phase and room-temperature multiferroic materials can accommodate many different cations and exhibit a rich spectrum of properties. In this review, firstly, we discussed the characteristics of Aurivillius-phase layered structure and recent progress in the field of synthesis of such materials with various architectures. Secondly, we summarized recent strategies to improve ferroelectric and magnetic properties, consisting of chemical modification, interface engineering, oxyhalide derivatives and morphology controlling. Thirdly, we highlighted some research hotspots on magnetoelectric effect, catalytic activity, microwave absorption, and photovoltaic effect for promising applications. Finally, we provided an updated overview on the understanding and also highlighting of the existing issues that hinder further development of the multifunctional Bin+1Fen−3Ti3O3n+3 materials.

scholarly journals Unravelling the nature of magneto-electric coupling in room temperature multiferroic particulate (PbFe0.5Nb0.5O3)–(Co0.6Zn0.4Fe1.7Mn0.3O4) composites

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Krishnamayee Bhoi ◽  
H. S. Mohanty ◽  
Ravikant ◽  
Md. F. Abdullah ◽  
Dhiren K. Pradhan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Room Temperature ◽  
Single Phase ◽  
Microstructural Analysis ◽  
Magnetic Ordering ◽  
Particulate Composite ◽  
Capacitance Measurement ◽  
Magnetic Field Sensors ◽  
Spintronic Devices ◽  
Electric Coupling

AbstractMultiferroic composites are promising candidates for magnetic field sensors, next-generation low power memory and spintronic devices, as they exhibit much higher magnetoelectric (ME) coupling and coupled ordering parameters compared to the single-phase multiferroics. Hence, the 3-0 type particulate multiferroic composites having general formula (1 − Φ)[PbFe0.5Nb0.5O3]-Φ[Co0.6Zn0.4Fe1.7Mn0.3O4] (Φ = 0.0, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 1.0, (1 − Φ) PFN-ΦCZFMO) were prepared using a hybrid synthesis technique. Preliminary structural and microstructural analysis were carried out using XRD and FESEM techniques, which suggest the formation of 3-0 type particulate composite without the presence of any impurity phases. The multiferroic behaviour of the composites is studied with polarization versus electric field (P-E) and magnetization versus magnetic field (M-H) characteristics at room temperature. The nature of ME coupling was investigated elaborately by employing the Landau free energy equation along with the magneto-capacitance measurement. This investigation suggests the existence of biquadratic nature of ME coupling (P2M2). The magneto-electric coupling measurement also suggests that strain mediated domain coupling between the ferroelectric and magnetic ordering is responsible for the magneto-electric behaviour. The obtained value of direct ME coefficient 26.78 mV/cm-Oe for Φ = 0.3, found to be higher than the well-known single-phase materials and polycrystalline composites.

Properties of Ferromagnetic GaGdN

2006 ◽  
Vol 955 ◽  
Author(s):  
J. K. Hite ◽  
R. P. Davies ◽  
R. M. Frazier ◽  
G. T. Thaler ◽  
C. R. Abernathy ◽  
...  
Keyword(s):  
Room Temperature ◽  
Single Phase ◽  
Room Temperature Ferromagnetism ◽  
Magnetic Ordering ◽  
Structural Defects ◽  
Drastic Reduction ◽  
Sapphire Substrates ◽  
Undoped Material ◽  
Si Content ◽  
Curie Temperatures

ABSTRACTSingle phase GaGdN and GaGdN:Si films were grown on sapphire substrates. The undoped films were highly resistive films but became conductive with the addition of Si. SQUID magnetometry indicated room temperature ferromagnetism in both types of materials. Structural defects had a strong influence on the magnetic ordering of the material, as seen in a drastic reduction of magnetic moment with degrading crystalline quality. Magnetization of the co-doped film increased with Si content, reaching levels higher than that of the undoped material. Gd-doped AlN films grown in a similar fashion also displayed Curie temperatures above room temperature.

scholarly journals A three-order-parameter bistable magnetoelectric multiferroic metal

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Andrea Urru ◽  
Francesco Ricci ◽  
Alessio Filippetti ◽  
Jorge Íñiguez ◽  
Vincenzo Fiorentini
Keyword(s):  
First Principles ◽  
Room Temperature ◽  
Single Phase ◽  
Ground States ◽  
Cross Coupling ◽  
Growth Conditions ◽  
Layered Perovskite ◽  
First Principles Calculations ◽  
Strongly Coupled ◽  
Primary Order

Abstract Using first-principles calculations we predict that the layered-perovskite metal Bi5Mn5O17 is a ferromagnet, ferroelectric, and ferrotoroid which may realize the long sought-after goal of a room-temperature ferromagnetic single-phase multiferroic with large, strongly coupled, primary-order polarization and magnetization. Bi5Mn5O17 has two nearly energy-degenerate ground states with mutually orthogonal vector order parameters (polarization, magnetization, ferrotoroidicity), which can be rotated globally by switching between ground states. Giant cross-coupling magnetoelectric and magnetotoroidic effects, as well as optical non-reciprocity, are thus expected. Importantly, Bi5Mn5O17 should be thermodynamically stable in O-rich growth conditions, and hence experimentally accessible.

On the occurrence of a metastable tetragonal t′-phase in a ZrO2−13.6 mole % MgO ceramic and its microscopic thermal evolution

1993 ◽  
Vol 8 (3) ◽  
pp. 605-610 ◽  
Author(s):  
M.C. Caracoche ◽  
P.C. Rivas ◽  
A.F. Pasquevich ◽  
A.R. López García ◽  
E. Aglietti ◽  
...  
Keyword(s):  
Thermal Behavior ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Single Phase ◽  
Thermal Evolution ◽  
Hyperfine Interactions ◽  
Correlation Technique ◽  
Cubic Field ◽  
Time Differential ◽  
T Phase

The time-differential perturbed angular correlation technique has been used to investigate the thermal behavior of a ZrO2−13.6 mole % MgO ceramic between room temperature and 1423 K. Two different quadrupole hyperfine interactions corresponding to a tetragonal structure have been found to result on cooling the ceramic from the single-phase cubic field. One of them agrees with that depicting the pure t-ZrO2 tetragonal phase and the other one has been interpreted as describing a high-MgO-content nontransformable t'–ZrO2 phase. As temperature increases, the latter gives rise to a similar but fluctuating interaction related to the oxygen vacancies mobility and which shows a thermal behavior analogous to that already reported for the stabilized cubic ZrO2. Above 1100 K these dynamic t'-sites transform into pure tetragonal ones which behave ordinarily, suffering the t → m phase transition when cooling to room temperature. Differences found between TDPAC results and information drawn from other techniques are discussed.

Molecule-Based Magnets—An Overview

MRS Bulletin ◽  
2000 ◽  
Vol 25 (11) ◽  
pp. 21-30 ◽  
Author(s):  
Joel S. Miller ◽  
Arthur J. Epstein
Keyword(s):  
Low Temperature ◽  
Vapor Deposition ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Magnetic Ordering ◽  
Low Density ◽  
Materials Properties ◽  
The Common ◽  
New Processing ◽  
Very High

Molecule-based magnets are a broad, emerging class of magnetic materials that expand the materials properties typically associated with magnets to include low density, transparency, electrical insulation, and low-temperature fabrication, as well as combine magnetic ordering with other properties such as photoresponsiveness. Essentially all of the common magnetic phenomena associated with conventional transition-metal and rare-earth-based magnets can be found in molecule-based magnets. Although discovered less than two decades ago, magnets with ordering temperatures exceeding room temperature, very high (∼27.0 kOe or 2.16 MA/m) and very low (several Oe or less) coercivities, and substantial remanent and saturation magnetizations have been achieved. In addition, exotic phenomena including photoresponsiveness have been reported. The advent of molecule-based magnets offers new processing opportunities. For example, thin-film magnets can be prepared by means of low-temperature chemical vapor deposition and electrodeposition methods.

Impedance Spectroscopy Study of LiTaO3 Powder Synthesized via Sol-Gel Method

2012 ◽  
Vol 545 ◽  
pp. 275-278 ◽  
Author(s):  
Lili Widarti Zainuddin ◽  
Norlida Kamarulzaman
Keyword(s):  
Room Temperature ◽  
Single Phase ◽  
Sol Gel ◽  
Rhombohedral Structure ◽  
Spectroscopy Study ◽  
X Ray Diffraction ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Impedance Spectroscopy Study

A ceramics sample of LiTaO3 was prepared using a sol-gel method. The sample is annealed at 750 °C for 48 hours. X-ray diffraction analysis indicate the formation of single phase, rhombohedral structure. An ac impedance study was used to analyse the conductivity of LiTaO3 at room temperature and at various temperatures.

Intercalation of Tris(2,2′-bipyridine)ruthenium(II) into a Layered Perovskite Derived from Aurivillius Phase Bi2SrTa2O9

2005 ◽  
Vol 34 (10) ◽  
pp. 1406-1407 ◽  
Author(s):  
Zhiwei Tong ◽  
Shinsuke Takagi ◽  
Tetsuya Shimada ◽  
Hiroshi Tachibana ◽  
Haruo Inoue
Keyword(s):  
Layered Perovskite ◽  
Aurivillius Phase

Magnetic Ordering in Relation to the Room-Temperature Magnetoelectric Effect ofSr3Co2Fe24O41

2011 ◽  
Vol 106 (8) ◽  
Author(s):  
Minoru Soda ◽  
Taishi Ishikura ◽  
Hiroyuki Nakamura ◽  
Yusuke Wakabayashi ◽  
Tsuyoshi Kimura
Keyword(s):  
Room Temperature ◽  
Magnetoelectric Effect ◽  
Magnetic Ordering
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