Tunable M-type nano barium hexaferrite material by Zn<sup>2+</sup>/Zr<sup>4+</sup> co-doping

Godara, Sachin Kumar; Kaur, Varinder; Narang, Sukhleen Bindra; Singh, Mandeep; Bhadu, Gopala Ram; Chaudhari, Jayesh C.; Mudsainiyan, Rahul Kumar; Sood, Ashwani Kumar

doi:10.1088/2053-1591/ab4894

Cited by 23 publications

(6 citation statements)

References 46 publications

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“…M r and M s beyond x = 0.20.A weakening of superexchange interaction has been reported in case of BaZn x Zr x Fe 12-2x O 19 by the measurement of magnetization vs. temperature data[29]. The decrease in T c from 711.9 K in x = 0.00 sample to 522.8 K in x = 0.80 sample confirmed the weakening of superexchange interactions.…”

supporting

confidence: 54%

“…All the strontium hexaferrite samples doped by Zn 2+ -Zr 4+, show nearly identical peak positions as those of undoped SrM, however, with decreasing peak intensity. The Raman peaks also tend to broaden (broadening effect is highlighted in Figure 4c) with increasing Zn 2+ and Zr 4+ dopant concentration [29,52]. This is because of the fact that doping causes a local distortion of the crystal lattice which results in the decrease in intensity and broadening of Raman peaks.…”

Section: Raman Studiesmentioning

confidence: 94%

“…It is clear from the table that the lattice parameter 'a' is varies between 5.8802 to 5.9148Å whereas 'c' varied in between 23.0574 to 23.2925Å with composition in samples calcined at 1000°C. The variation can be explained on the basis of higher atomic radii of Zn 2+ and Zr 4+ ions as compared to Fe 3+ [25,26,29]. The c/a ratios for the M-type hexaferrites has been reported to be lower than 3.98 [43].…”

Section: Structural Studiesmentioning

confidence: 98%

“…The initial parameters of the SrM phase were taken from ICSD 98-002-6353. The procedure for carrying out Rietveld refinement is same as reported elsewhere [29,46]. The Rietveld refined (along with experimental and difference data) data is shown in Figure 2a, b.…”

Section: Structural Studiesmentioning

confidence: 99%

“…By adequately substituting different types of cations at the M 2+ or Fe 3+ site, magnetic properties of M-type hexaferrite can be improved. Several authors have tried to tailor M-type hexaferrites properties by replacing Fe 3+ by divalent cations such as Co, Cu, Ga, Ni [12][13][14][15], trivalent cations such as Al, Ce, La, Nd, Pr [16,17] and mixture of cations such as Co-Zr [18], Cu-V [19], Gd-Co [20], La-Co [21], Nd-Co [22], Zn-Mo [23], and Zn-Zr [24][25][26][27][28][29]. Very few studies have been reported on the alteration of SrM's magnetic properties by co-substitution of Zn 2+ -Zr 4+ cations [24--26].…”

Section: Introductionmentioning

confidence: 99%

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Tailoring the magnetic properties of M-type strontium ferrite with synergistic effect of co-substitution and calcinations temperature

Godara

Kaur

Narang

et al. 2021

Journal of Asian Ceramic Societies

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SrFe 12 O 19 samples were initially prepared using sol-gel auto-combustion method and calcined from 500 to 1100°C (for 6 h). XRD data established the phase formation temperature of SrM phase to be ≈1000°C. Thereafter, the effect of Zn 2+ -Zr 4+ co-dopant on magnetic and structural properties of SrZn x Zr x Fe 12-2x O 19 (x = 0.00-1.00) samples calcined between 900-1100°C was investigated. XRD data shows that the cell volume increases (from 690.45Å 3 (x = 0.00) to 705.72Å 3 (x = 1.00)) while crystallite size decreases (from 123.9 nm (x = 0.00) to 62.3nm (x = 1.00)) calcined at 1000°C. The Rietveld refinement of XRD data confirms a) x = 0.00 sample to be phase pure and b) the presence of ZnFe 2 O 4 (≈2.25) & SrZrO 3 (≈2.93%) impurity phases in x = 1.00 sample, calcined at 1000°C. FESEM micrographs revealed that a) grain size decreases for x > 0.20 with `x' at 900°C and b) increases from 122 nm at 900°C to 443 nm at 1100°C, for x = 0.00. Broadening of Raman bands reveals generation of strain in the lattice with enhancement of Zn 2+ -Zr 4+ concentration. The magnetic studies reveal that the coercivity monotonically decreases (from 5358(x = 0.00) Oe to 690(x = 1.00) Oe at 1000°C) with enhancement of Zn 2+ -Zr 4+ concentration. A maximum M s value ≈ 70.89 emu/g was observed in x = 0.20 sample at 1100°C. M s value also decreases for x > 0.20 at each calcination temperature.

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supporting

confidence: 54%

Section: Raman Studiesmentioning

confidence: 94%