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Title: Magnetic properties of Bi(Fe{sub 1-x}Cr{sub x})O{sub 3} synthesized by a combustion method

Abstract

Single-phase samples of Bi(Fe{sub 1-x}Cr{sub x})O{sub 3} with x=0, 0.1, and 0.2 were synthesized by a combustion method. X-ray diffraction reveals that the lattice parameters of Bi(Fe{sub 1-x}Cr{sub x})O{sub 3} perovskites decrease linearly with the Cr content, indicating that Cr ions substitute for Fe ions to form a solid solution. X-ray photoelectron spectroscopy investigation shows that Cr ions have the Cr{sup 3+} valence state in Bi(Fe{sub 1-x}Cr{sub x})O{sub 3}. The frequency dependence of dielectric constants was investigated at room temperature. Magnetic measurements show hysteresis loops at both 5 and 300 K and the substitution of Cr for Fe enhances the magnetization.

Authors:
; ; ; ; ;  [1]
  1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080 (China)
Publication Date:
OSTI Identifier:
20960224
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 90; Journal Issue: 16; Other Information: DOI: 10.1063/1.2720349; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BISMUTH COMPOUNDS; CHROMIUM IONS; CHROMIUM OXIDES; COMBUSTION; FREQUENCY DEPENDENCE; IRON IONS; IRON OXIDES; LATTICE PARAMETERS; MAGNETIC PROPERTIES; MAGNETIZATION; PERMITTIVITY; PEROVSKITES; SOLID SOLUTIONS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0000-0013 K; TEMPERATURE RANGE 0013-0065 K; TEMPERATURE RANGE 0065-0273 K; TEMPERATURE RANGE 0273-0400 K; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY

Citation Formats

Li, J.-B., Rao, G. H., Liang, J. K., Liu, Y. H., Luo, J., and Chen, J. R.. Magnetic properties of Bi(Fe{sub 1-x}Cr{sub x})O{sub 3} synthesized by a combustion method. United States: N. p., 2007. Web. doi:10.1063/1.2720349.
Li, J.-B., Rao, G. H., Liang, J. K., Liu, Y. H., Luo, J., & Chen, J. R.. Magnetic properties of Bi(Fe{sub 1-x}Cr{sub x})O{sub 3} synthesized by a combustion method. United States. doi:10.1063/1.2720349.
Li, J.-B., Rao, G. H., Liang, J. K., Liu, Y. H., Luo, J., and Chen, J. R.. Mon . "Magnetic properties of Bi(Fe{sub 1-x}Cr{sub x})O{sub 3} synthesized by a combustion method". United States. doi:10.1063/1.2720349.
@article{osti_20960224,
title = {Magnetic properties of Bi(Fe{sub 1-x}Cr{sub x})O{sub 3} synthesized by a combustion method},
author = {Li, J.-B. and Rao, G. H. and Liang, J. K. and Liu, Y. H. and Luo, J. and Chen, J. R.},
abstractNote = {Single-phase samples of Bi(Fe{sub 1-x}Cr{sub x})O{sub 3} with x=0, 0.1, and 0.2 were synthesized by a combustion method. X-ray diffraction reveals that the lattice parameters of Bi(Fe{sub 1-x}Cr{sub x})O{sub 3} perovskites decrease linearly with the Cr content, indicating that Cr ions substitute for Fe ions to form a solid solution. X-ray photoelectron spectroscopy investigation shows that Cr ions have the Cr{sup 3+} valence state in Bi(Fe{sub 1-x}Cr{sub x})O{sub 3}. The frequency dependence of dielectric constants was investigated at room temperature. Magnetic measurements show hysteresis loops at both 5 and 300 K and the substitution of Cr for Fe enhances the magnetization.},
doi = {10.1063/1.2720349},
journal = {Applied Physics Letters},
number = 16,
volume = 90,
place = {United States},
year = {Mon Apr 16 00:00:00 EDT 2007},
month = {Mon Apr 16 00:00:00 EDT 2007}
}
  • Graphical abstract: TEM micrographs of La{sub 1−x}Ce{sub x}Fe{sub 1−x}Cr{sub x}O{sub 3} for x = 0.0. - Highlights: • The composition of La{sub 1−x}Ce{sub x}Fe{sub 1−x} Cr{sub x}O{sub 3} was prepared by co-precipitation method. • X-ray diffraction showed orthorhombic structure with space group Pnma. • With increasing Ce and Cr content, a decrease of the unit cell volume. • Enhancement in the coercivity (H{sub c}) with increasing Ce and Cr content. • Reduction of M{sub s} and M{sub r} up to x = 0.15 and increases with further increases of x. - Abstract: Nanocrystalline orthoferrites with the composition of La{sub 1−x}Ce{submore » x}Fe{sub 1−x} Cr{sub x}O{sub 3} where (x = 0, 0.1, 0.15 and 0.2) were prepared by co-precipitation method. The structural and magnetic properties of the La{sub 1−x}Ce{sub x}Fe{sub 1−x}Cr{sub x}O{sub 3} system have been investigated. X-ray diffraction showed the formation of orthorhombic structure with space group Pnma for different compositions. With increasing Ce and Cr content, lattice parameters a and c were found to decrease while b increases, resulting in a decrease of the unit cell volume. The crystallite size was calculated from XRD data and compared with that obtained from TEM micrographs. Vibrating sample magnetometer measurements reveal an enhancement in the coercivity (H{sub c}) with increasing Ce and Cr content and reduction of saturation magnetization (M{sub s}) and remnant magnetization (M{sub r}) up to x = 0.15 and increases with further increases of x. The magnetic susceptibility measurements vs. temperature showed canted-antiferromagnetic (AFM) in which the Neel temperature is increasing with Ce and Cr content.« less
  • Graphical abstract: Bi{sub 1-y}Sr{sub y}Fe{sub (1-y)(1-x)}Sc{sub (1-y)x}Ti{sub y}O{sub 3} (x = 0-0.2, y = 0.1-0.3) ceramics were obtained by solid-state reaction method. Addition of scandium could simultaneously reduce magnetic coercive field and enhance dielectric properties of prepared samples. Research highlights: {yields} The electrical resistivity of BiFeO{sub 3} is enhanced by forming solid solution with SrTiO{sub 3}. {yields} We further replace Fe{sup 3+} by Sc{sup 3+} in solid solution to reduce H{sub c} and achieve a soft magnet. {yields} Structure-magnetic property relationship has been established by Rietveld refinement. {yields} Sc{sup 3+} substitution can inhibit the dielectric loss effectively. -- Abstract: Inmore » this study, bulk ceramics with general formula Bi{sub 1-y}Sr{sub y}Fe{sub (1-y)(1-x)}Sc{sub (1-y)x}Ti{sub y}O{sub 3} (x = 0-0.2, y = 0.1-0.3 mol%) were prepared by traditional solid-state reaction method. As a comparison, bulk BiFeO{sub 3} (BF) was also sintered by rapid sintering method. Their structural, magnetic, dielectric properties were investigated. X-ray diffraction analysis indicated that apart from a small amount of secondary phase detected in BF, all other samples crystallized in pure perovskite structure and maintained original R3c space group. The room temperature M-H curves were obtained. While BF had a coercive magnetic field (H{sub c}) of 150 Oe, Bi{sub 1-y}Sr{sub y}Fe{sub 1-y}Ti{sub y}O{sub 3} solid solutions had a much larger value (for y = 0.1, 0.2, 0.3, H{sub c} were 4537, 5230 and 3578 Oe, respectively). Sc{sup 3+} substitution decreased the H{sub c} values of these solid solutions remarkably, and resulted in soft magnetic properties, as well as a decrease of the dielectric loss. At 1 MHz, the tan {delta} of Bi{sub 0.7}Sr{sub 0.3}Fe{sub 0.7(1-x)}Sc{sub 0.7x}Ti{sub 0.3}O{sub 3} with x = 0.05, 0.1, 0.15, 0.2 were 0.1545, 0.1078, 0.1046 and 0.1701, respectively.« less
  • Two series of (In{sub 1-x}Fe{sub x}){sub 2}O{sub 3} were prepared by a solution combustion method using different fuel-to-oxidizer (i.e. glycine/metal nitrate, G/N) ratios. The crystal structure and magnetic properties of the compounds were investigated by means of X-ray diffraction, transmission electron microscopy and magnetic measurements. Detailed structural analysis shows the solubility limits of Fe in In{sub 2}O{sub 3} are x=0.08 and 0.45 for the G/N ratios of 5/4 and 5/6, respectively. Crystallite size of the samples prepared with the G/N ratio of 5/6 is much smaller than that of the samples prepared with the G/N ratio of 5/4. At roommore » temperature, the sample with x=0.01 prepared with the G/N ratio of 5/4 is paramagnetic and those with x=0.03-0.07 are ferromagnetic, whereas the samples with x=0.15-0.45 prepared with the G/N ratio of 5/6 show superparamagnetic behavior and those samples with x<0.15 are paramagnetic. Different magnetic behavior of these two series of samples could be attributed to different origins of magnetism. The magnetism of the samples prepared with the G/N ratio of 5/4 might originate from the existence of mixed valence Fe ions whereas the magnetism of the samples prepared with the G/N ratio of 5/6 could be due to the small crystallite size. - Graphical abstract: The G/N ratio (5/4 and 5/6, respectively) has a prominent effect on the particle size and magnetic properties of Fe-doped In{sub 2}O{sub 3} nanoparticles.« less
  • Bi{sub 1-x}Sr{sub x}FeO{sub 3-x/2} (I), Bi{sub 1-x}Sr{sub x}Fe{sub 1-x}MnxO{sub 3} (II), and Bi{sub 1-x}Ca{sub x}Fe{sub 1-x}Mn{sub x}O{sub 3} (III) solid solutions have been obtained. Their magnetization has been measured by X-ray and neutron diffraction and Moessbauer spectroscopy. According to the Moessbauer spectroscopy data, iron ions are in the trivalent state in system I. Near the concentration x {approx} 0.2, rhombohedral distortions (sp. gr. R3c) are transformed into tetragonal (P4/mmm). The symmetry of system II changes at x > 0.2 (R3c {sup {yields}} R3c), whereas orthorhombic distortions (R3c {sup {yields}} Pbnm) arise in system III at x > 0.2. The magneticmore » structure is antiferromagnetic (of G type). The samples of systems II and III exhibit weak ferromagnetism at x > 0.2 due to the Dzyaloshinski-Moriya interaction.« less
  • Epitaxial Y[sub 3]Fe[sub 5]O[sub 12](YIG)/Bi[sub 3]Fe[sub 5]O[sub 12](BIG) and YIG/Eu[sub 1]Bi[sub 2]Fe[sub 5]O[sub 12](EBIG) heterostructures have been grown on [111] oriented single-crystalline gadolinium-gallium-garnet substrates by pulsed laser deposition. The effects of the layer thickness ratios on the composition, microstructure, and magnetic properties of the films have been studied employing x-ray diffraction, Rutherford backscattering spectroscopy, vibration sample magnetometry, and Kerr magnetometry. All films under investigation are single crystalline, in the [111] orientation. The multilayered heterostructures displayed superior magnetic properties in comparison to their single crystalline monolayer counterparts, deposited at the same conditions. The YIG/BIG heterostructures indicate increased in-plane saturation magnetic moments,more » approaching the maximum saturation value in bulk YIG. The YIG/EBIG heterostructures show a definite reorientation of the magnetic moment in the out-of-plane direction, a new set of increased saturation magnetization values that go even above that recorded for the bulk YIG, as well as an increase in coercivity.« less