Structural, magnetic, microwave permittivity and permeability studies of barium monoferrite (BaFe2O4)

Dimri, Mukesh C.; Khanduri, H.; Agarwal, PK; Pahapill, Jüri; Stern, Raivo

doi:10.1016/j.jmmm.2019.165278

Cited by 32 publications

(7 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The phase equilibria in the quasi‐binary systems BaO–Fe 2 O 3 and Nd 2 O 3 –BaO at 1373 K in air and the crystal structure of the complex oxides formed in these systems were presented in our early papers 40,51 . The existence of only NdFeO 3 was confirmed in the Nd 2 O 3 –Fe 2 O 3 system at 1373 K in air, which is in a good agreement with the results reported earlier 29–32 . The chemical formulas and unit cell parameters of stable ternary oxides are listed in Table 1.…”

Section: Resultssupporting

confidence: 84%

“…40,51 The existence of only NdFeO 3 was confirmed in the Nd 2 O 3 -Fe 2 O 3 system at 1373 K in air, which is in a good agreement with the results reported earlier. [29][30][31][32] The chemical formulas and unit cell parameters of stable ternary oxides are listed in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…Fe‐richest oxide, the BaFe 12 O 19 hexaferrite, crystallizes in the hexagonal structure (SG P 6 3 / mmc ), with the unit cell parameters: a = 5.89 Å and c = 23.23 Å 30 . BaFe 2 O 4 was prepared by the citrate‐nitrate combustion process 31,32 or by the Pechini method 33 . The BaFe 2 O 4 single phase adopts the orthorhombic spinel‐like structure (SG Bb 2 1 m ) with the lattice parameters: a = 19.042 Å, b = 5.3838 Å, and c = 8.4445 Å 33 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phase equilibria in the Nd₂O₃–BaO–Fe₂O₃ system: Crystal structure, oxygen content, and properties of intermediate oxides

et al. 2022

View full text Add to dashboard Cite

The phase equilibria in the ½Nd 2 O 3 -BaO-½Fe 2 O 3 system were systematically studied at 1373 K in air and presented in the form of a phase diagram. By X-ray diffraction (XRD) analysis of quenched samples, the homogeneity ranges and crystal structure were determined for the following intermediate oxides: Nd 1-x Ba x FeO 3-δ with 0.0 ≤ x ≤ 0.05 (space group (SG) Pnma) and with 0.6 ≤ x ≤ 0.7 (SG Pm-3m), Ba 6+y Nd 2-y Fe 4 O 15-δ with 0.0 ≤ y ≤ 0.4 (SG P6 3 mc), and Ba 1.1 Nd 1.9 Fe 2 O 7-δ (SG P4 2 /mnm). The structural parameters of single-phase oxides were refined by the Rietveld method. The changes in oxygen content for Nd 1-x Ba x FeO 3-δ (0.6 ≤ x ≤ 0.7), Ba 6 Nd 2 Fe 4 O 15-δ , and Ba 1.1 Nd 1.9 Fe 2 O 7-δ versus temperature in air were determined by thermogravimetric analysis. Gradual substitution of neodymium by barium in the Nd 1-x Ba x FeO 3-δ (0.6 ≤ x ≤ 0.7) oxides leads to a decrease of oxygen content. Partial ordering via formation of separate domains with a p × a p × 5a p superstructure in Nd 0.4 Ba 0.6 FeO 3-δ , which cannot be detected by XRD, noticeably influence its thermal expansion and electrical conductivity.

show abstract

Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Phase equilibria in the Nd₂O₃–BaO–Fe₂O₃ system: Crystal structure, oxygen content, and properties of intermediate oxides

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Based on the crystallographic structures, the ferrite NPs can be categorized as orthorhombic, hexagonal, and cubic [16][17][18]. The cubic MeFe 2 O 4 (Me = Ni 2+ , Fe 3+ , Co 2+ , Mg 2+ ) and orthorhombic MeFe 2 O 4 (Me = Ba 2+ or Ca 2+ ) magnetic materials are promising for various applications [19][20][21][22][23]. Cubic ferrite NPs such as NiFe 2 O 4 have a spinel structure and exhibit magnetically soft behavior [24].…”

Section: Introductionmentioning

confidence: 99%

Tuning the Structural and Magnetic Properties of the Stuffed Framework Structures MeFe2O4 (Me = Ni, Ca, and Sr)

Ateia

Hussien

Mohamed

2022

J Inorg Organomet Polym

View full text Add to dashboard Cite

Spinel ferrite nanoparticles (NPs), have received a lot of attention in medical applications. Therefore, facile synthesis of ferrite NPs of numerous shapes and sizes using the citrate autocombustion technique was utilized in this article. A series of ferrite with the general formula MeFe2O4 [Me = nickle (Ni), calcium (Ca), and strontium (Sr)] are synthesized with varying average ionic radii and cation disorder on the A-site. The structural and morphological characterization of the prepared samples was performed using XRD, HRTEM, FESEM, EDAX, XPS, and Raman analyses. The phase transformation from cubic (Ni) to orthorhombic (Ca) to monoclinic (Sr) was also revealed by XRD. Accordingly, HRTEM images demonstrated nanoparticles in orthorhombic and monoclinic shapes, which are inconsistent with XRD analyses. The coercive field HC for monoclinic SrFe2O4 is ≈ 42 times larger than the Hc for NiFe2O4 with a cubic structure. This deviation in HC compared to the cubic shape particles can be coupled to the shape anisotropy present in SrFe2O4 and refers to the presence of a preferred magnetization direction within the material. The use of monoclinic SrFe2O4 NPs as antifungal activity agents is noteworthy due to their advantages in terms of surface area, efficacy, and biodegradability.

show abstract

“…[13]. When the ionic radii of the constituting cations are comparable, cubic spinel ferrites is formed; if not, less symmetric ferrites are encountered, such as hexagonal SrFe2O4 [14] and orthorhombic BaFe2O4 [15]. The unit cell of cubic spinels consists of eight formula units (octants) with 32 oxygen atoms residing at the vertices of a face-centered lattice.…”

Section: Introductionmentioning

confidence: 99%

The impact of cation distribution on the structural and magnetic properties of nonstoichiometric Co0.5Ni0.5+xFe2−xO4 nanoferrites

Wahba

Moharam

Mahmoud

2021

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

In this work, the impact of nonstoichiometric substitution of Fe 3+ cations by Ni 2+ ones on the structural and magnetic properties of Co0.5Ni0.5+xFe2xO4 (0.0 ≤ x ≤ 0.4) nanoferrites synthesized by citric autocombustion method. The cubic phase purity for sintered samples were verified by XRD patterns and FTIR spectra. The crystallite size and microstrain were deduced using Williamson-Hall method. The estimated crystallite size ranges from 55 to 89 nm in agreement with TEM microimages. Hysteresis loops traced using VSM prevailed a regular reduction of saturation magnetization with Ni substitution. Relied on the experimental data of XRD, FTIR, and VSM, cation distribution has been suggested, according to which the nonstoichiometric substitution was compensated by the appearance of higher valance states of Fe, Ni, and Co cations. The suggested cation distribution successfully explained the recorded data of lattice parameter, crystallite size, IR frequencies, magnetization and coercivity.

show abstract

Structural, magnetic, microwave permittivity and permeability studies of barium monoferrite (BaFe2O4)

Cited by 32 publications

References 33 publications

Phase equilibria in the Nd₂O₃–BaO–Fe₂O₃ system: Crystal structure, oxygen content, and properties of intermediate oxides

Phase equilibria in the Nd₂O₃–BaO–Fe₂O₃ system: Crystal structure, oxygen content, and properties of intermediate oxides

Tuning the Structural and Magnetic Properties of the Stuffed Framework Structures MeFe2O4 (Me = Ni, Ca, and Sr)

The impact of cation distribution on the structural and magnetic properties of nonstoichiometric Co0.5Ni0.5+xFe2−xO4 nanoferrites

Contact Info

Product

Resources

About

Structural, magnetic, microwave permittivity and permeability studies of barium monoferrite (BaFe2O4)

Cited by 32 publications

References 33 publications

Phase equilibria in the Nd2O3–BaO–Fe2O3 system: Crystal structure, oxygen content, and properties of intermediate oxides

Phase equilibria in the Nd2O3–BaO–Fe2O3 system: Crystal structure, oxygen content, and properties of intermediate oxides

Tuning the Structural and Magnetic Properties of the Stuffed Framework Structures MeFe2O4 (Me = Ni, Ca, and Sr)

The impact of cation distribution on the structural and magnetic properties of nonstoichiometric Co0.5Ni0.5+xFe2−xO4 nanoferrites

Contact Info

Product

Resources

About

Phase equilibria in the Nd₂O₃–BaO–Fe₂O₃ system: Crystal structure, oxygen content, and properties of intermediate oxides

Phase equilibria in the Nd₂O₃–BaO–Fe₂O₃ system: Crystal structure, oxygen content, and properties of intermediate oxides