Influence of samarium substitution on the structural and magnetic properties of M-type hexagonal ferrites

Yasmin, Nazia; Mirza, Misbah; Safdar, Muhammad; Zahid, Maria; Ahmad, Mahmood; Awan, M. S.; Altaf, Muhammad

doi:10.1016/j.jmmm.2017.09.005

Cited by 47 publications

(11 citation statements)

References 32 publications

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“…Up to x = 0.20, the K 1 and H A first gradually increased with increasing Ca content (x): from 289.55 to 318.81 kJ/ m 3 , and from 15.311 to 16.560 kOe, respectively, which was similar to the behavior of H c (i.e., from 7035.1 to 7880 4. Oe) in Sr 0.75−x La 0.25 Ca x Fe 11.8 Co 0.2 O 19…”

mentioning

confidence: 52%

“…To date, many reports have suggested M-type Sr-hexaferrite (SrFe 12 O 19 ) with elemental substitutions as a viable candidate for a high-performance magnet, by the substitution of RE ions and other cations such as Sm 3+ 4 , Sm 3+ –Co 2+ 5 , La 3+ –Sm 3+ 6 , La 3+ –Co 2+ 7 , 8 , Nd 3+ 9 , Nd 3+ –Y 3+ 10 , and Nd 3+ –Co 2+ 11 . Among these gap magnets, partial La 3+ –Co 2+ -substituted Sr-ferrite has received great attention due to the successful enhancement in its intrinsic coercivity ( H c ) 8 , 12 .…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic characteristics and improved magnetic performance of Ca–La–Co-substituted strontium hexaferrite nanomagnets

Lee

Hwang

et al. 2020

Sci Rep

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Recent studies on next-generation permanent magnets have focused on filling in the gap between rare-earth magnets and rare-earth-free magnets, taking into account both the cost-effectiveness and magnetic performance of the magnetic materials. As an improved rare-earth-free magnet candidate, here, Ca-substituted M-type Sr-lean hexaferrite particles within a nano- to micro-scale regime, produced using an ultrasonic spray pyrolysis method, are investigated. Theoretically, the maximum coercivity (Hc) can be achieved in submicron Sr-ferrite crystals (i.e., 0.89 μm). The plate-like resultants showed a significant enhancement in Hc, up to a record high of 7880.4 Oe, with no deterioration in magnetization (M: 71–72 emu/g). This resulted in more favorable magnetic properties than those of the traditional Sr–La–Co ferrites. On the basis of microstructural analysis and fitting results based on the law of approach to saturation method, the Ca-substitution effects on the change in size and anisotropic characteristics of the ferrite particles, including pronounced lateral crystal growth and a strong increase in magnetocrystalline anisotropy, are clearly demonstrated. The cost-effective, submicron, and Ca-substituted Sr-ferrite is an excellent potential magnet and moreover may overcome the limitations of traditional hard magnetic materials.

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confidence: 52%

Section: Introductionmentioning

confidence: 99%

Anisotropic characteristics and improved magnetic performance of Ca–La–Co-substituted strontium hexaferrite nanomagnets

Lee

Hwang

et al. 2020

Sci Rep

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“…In last time, barium and strontium hexagonal ferrites continue to attract the close attention of researchers in various fields of science and technology [1][2][3][4][5][6][7]. These compounds were discovered in the early 50-ies of the last century [8].…”

Section: Introductionmentioning

confidence: 99%

Magnetic and dipole moments in indium doped barium hexaferrites

Trukhanov

Турченко

Труханов

et al. 2018

Journal of Magnetism and Magnetic Materials

117

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Crystal and magnetic structure of the doped BaFe12-xInxO19 samples were refined by the results of investigations using high resolution neutron powder diffraction and vibration sample magnetometry at different temperatures. The refinements were realized in frame of two space groups. The P63/mmc (No 194) centrosymmetric nonpolar and P63mc (No 186) noncentrosymmetric polar space groups were used. The unit cell parameters, ionic coordinates, thermal isotropic factors, occupation positions, bond lengths and bond angles, microstrain values were established. The magnetic and dipole moments were also defined. It is established that the In3+ cations may be located only in the Fe1 -2a and Fe2 -2b crystallographic positions with equal probability for the sample with lowest substitution level x = 0.1. At the x = 1.2 substitution level about half of the In3+ cations occupies the Fe5 -12k positions. For the last sample the remaining half of the In3+ cations is equiprobably located in the Fe1 -2a and Fe2 -2b positions. The spontaneous polarization was established for these compositions at 300 K. It is studied the influence of the type of substitutive cation and structural parameters on the Fe3+(i) -O2--Fe3+(j) (i, j = 1, 2, 3, 4, 5) indirect superexchange interactions with temperature. With substitution level increase the superexchange interactions between the magnetic positions inside and outside the sublattices are broken which leads to a decrease in the value of their magnetic moments.

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“…Thus, improving its orientation can increase the Mr / Ms ratio. As for coercivity ( Hc ), it is mainly affected by the reversal of the magnetic moment, the defect in the grain boundary and porosity . The reversal of the magnetic moment is dependent on the domain structure.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of dense, fine‐grained hexagonal barium ferrite ceramics by two‐step sintering process

Zhou

Zheng

Liang

et al. 2018

Int J Applied Ceramic Tech

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Two-step sintering (TSS) process has been used to fabricate hexagonal barium ferrite (BaFe 12 O 19 , BaM) ceramics with high density and fine grain size. The densification, microstructure, and magnetic properties were investigated. The sample prepared by the TSS process with the first-step sintering temperature of 1325°C, the second-step sintering temperature of 1300°C, and holding time of 20 hours has a density of 98.01 AE 0.25% of the theoretical density (5.29 g/cm 3 ) and exhibits a uniform microstructure with small average grain size (2.92 AE 0.05 lm). In addition, the saturation magnetization of BaM ceramics has been effectively improved and the value is around 69 emu/g, which is close to theoretical saturation magnetization (72 emu/g). Briefly, using the TSS process can obtain dense and fine-grained BaM ceramics with high saturation magnetization. K E Y W O R D Shexagonal barium ferrite, microstructure, two-step sintering Synthesis of dense, fine-grained hexagonal barium ferrite ceramics by two-step sintering process. Int J Appl Ceram

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Influence of samarium substitution on the structural and magnetic properties of M-type hexagonal ferrites

Cited by 47 publications

References 32 publications

Anisotropic characteristics and improved magnetic performance of Ca–La–Co-substituted strontium hexaferrite nanomagnets

Anisotropic characteristics and improved magnetic performance of Ca–La–Co-substituted strontium hexaferrite nanomagnets

Magnetic and dipole moments in indium doped barium hexaferrites

Synthesis of dense, fine‐grained hexagonal barium ferrite ceramics by two‐step sintering process

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