Effect of calcination temperature on microstructure, dielectric, magnetic and optical properties of Ba0.7La0.3Fe11.7Co0.3O19 hexaferrites

Kaur, Talwinder; Kaur, Barjinder Pal; Bhat, Bilal Hamid; Godara, Sachin Kumar; Srivastava, A. K.

doi:10.1016/j.physb.2014.09.003

Cited by 120 publications

(32 citation statements)

References 36 publications

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“…The peaks shown in Fig. 1 [19] confirm the hexagonal structure of composites and are identical to the peaks in the standard pattern (JCPDS-391433). This proves that the substituted ions have occupied crystal sites.…”

Section: Resultssupporting

confidence: 55%

“…The synthesis of La–Co-substituted barium hexaferrite has been carried out through a sol–gel method [19] using metal nitrates (AR grade chemicals) without any purification. Aqueous solutions of iron and metal salts are mixed with each other in stoichiometric proportions, at ambient temperature under constant magnetic stirring.…”

Section: Methodsmentioning

confidence: 99%

“…Also, at the nano-scale, its optical properties [19], magnetic properties [20–21], piezo-electric properties [22], photocatalytic properties [23], gas-sensing properties [24], electrical properties, dielectric properties [25–26], and mechanical properties [27] are better than those of the bulk material. Hexaferrite is also extensively studied by researchers for radiation absorption which is based on magnetic resonance phenomena because of the anisotropy field [10,28].…”

Section: Introductionmentioning

confidence: 99%

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Radiation losses in the microwave K_u band in magneto-electric nanocomposites

Kaur¹,

Godara²,

Sharma³

et al. 2015

Beilstein J. Nanotechnol.

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SummaryA study on radiation losses in conducting polymer nanocomposites, namely La–Co-substituted barium hexaferrite and polyaniline, is presented. The study was performed by means of a vector network analyser, X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, electron spin resonance spectroscopy and a vibrating sample magnetometer. It is found that the maximum loss occurs at 17.9 GHz (−23.10 dB, 99% loss) which is due to the composition of a conducting polymer and a suitable magnetic material. A significant role of polyaniline has been observed in ESR. The influence of the magnetic properties on the radiation losses is explained. Further studies revealed that the prepared material is a nanocomposite. FTIR spectra show the presence of expected chemical structures such as C–H bonds in a ring system at 1512 cm−1.

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Section: Resultssupporting

confidence: 55%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Radiation losses in the microwave K_u band in magneto-electric nanocomposites

Kaur¹,

Godara²,

Sharma³

et al. 2015

Beilstein J. Nanotechnol.

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“…Modified Pechini sol gel method [28,29] has been employed to synthesize M-type barium hexaferrites Ba 1-x Gd x Co x Fe 12-x O 19 (x = 0 -0.6) using analytical grade chemicals powder such as Gd(NO 3 ) 3 · 6H 2 O (LOBA Chemie. India, 99% purity), Fe(NO 3 ) 3 .9H 2 O (LOBA Chemie., India, 98% purity), Ba(NO 3 ) 2 (LOBA Chemie., India, 99% purity), Co(NO 3 ) 2 ·6H 2 O (LOBA Chemie., India, 99% purity), and citric acid (C 6 H 8 O 7 ) (LOBA Chemie., India 99.5% purity).…”

Section: Methodsmentioning

confidence: 99%

Optical and Multiferroic Properties of Gd‐Co Substituted Barium Hexaferrite

Kaur

Sharma

Godara

et al. 2017

Crystal Research and Technology

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This report demonstrates Gd-Co substituted M-type barium hexaferrite, Ba 1-x Gd x Co x Fe 12-x O 19 , successful synthesis adopting sol gel method. Formation of crystalline magneto-plumbite structure and presence of other phases are verified from the X-ray diffraction analysis. Vibrational modes in FT-Raman spectra show the formation of P63/mmc group can be related with magneto-plumbite structure. TEM images of these materials are also discussed. UV-Vis-NIR spectra shows that with material substitution optical energy band gap increases 3.99 eV to 4.28 eV. The observed Fe 3+ ions peak could be correlated to peak line width and occurrence of symmetrical resonance in electron spin resonance (ESR) spectra. The dielectric constant shows high value at low frequency and it becomes constant at high frequency. The retentivity and coercivity of the material decreases with increasing substitution. Multiferroic nature of hexaferrite is analyzed using ferroelectric loops.

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“…The peak of α-Fe 2 O 3 appears in the sample sintered at 700, 900, and 1100 • C (shown as an asterisk between 107 and 114 peak). This indicates the occurrence of an incomplete crystallization reaction, the formation of nonhomogeneous mixture of starting compound solutions, and synthesis of SrNdC with impurity [12]. Table 1 Diffraction angle (2θ), d spacing (d), full width at half maximum (β), lattice constants (a and c), volume of cell (V cell ), X-ray density (D X ), particle size (D), phase present, strain induced (η), and surface area (S) with variation of sintering temperature for SrNdC …”

Section: Phase Analysis Of Srndcmentioning

confidence: 99%

Effect of Heat Treatment on Properties of Sr0.7Nd0.3Co0.3Fe11.7O19

Kumar

Kaur

Godara

et al. 2015

J Supercond Nov Magn

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In this work, strontium hexaferrite powder with composition Sr 0.7 Nd 0.3 Co 0.3 Fe 11.7 O 19 (SrNdC) was synthesized via a sol-gel method and sintered at 500, 700, 900, and 1100 • C. The properties like phase analysis, crystallite size, surface area, lattice constant, and strain were evaluated using X-ray diffraction (XRD). The presence of two prominent peaks at 432 and 586 cm −1 in Fourier transform infrared (FT-IR) spectra indicates the formation of hexaferrite. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show the cluster formation and hexagonal structure of synthesized hexaferrite. Thermogravimetric analysis (TGA) reveals the variation of mass of precursor with temperature and temperature of formation of SrNdC. M-H curves obtained from a vibrating sample magnetometer (VSM) show that the magnetic properties like coercivity, saturation, and retentivity are significantly affected by sintering temperature.

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Effect of calcination temperature on microstructure, dielectric, magnetic and optical properties of Ba0.7La0.3Fe11.7Co0.3O19 hexaferrites

Cited by 120 publications

References 36 publications

Radiation losses in the microwave K_u band in magneto-electric nanocomposites

Radiation losses in the microwave K_u band in magneto-electric nanocomposites

Optical and Multiferroic Properties of Gd‐Co Substituted Barium Hexaferrite

Effect of Heat Treatment on Properties of Sr0.7Nd0.3Co0.3Fe11.7O19

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Effect of calcination temperature on microstructure, dielectric, magnetic and optical properties of Ba0.7La0.3Fe11.7Co0.3O19 hexaferrites

Cited by 120 publications

References 36 publications

Radiation losses in the microwave Ku band in magneto-electric nanocomposites

Radiation losses in the microwave Ku band in magneto-electric nanocomposites

Optical and Multiferroic Properties of Gd‐Co Substituted Barium Hexaferrite

Effect of Heat Treatment on Properties of Sr0.7Nd0.3Co0.3Fe11.7O19

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Radiation losses in the microwave K_u band in magneto-electric nanocomposites

Radiation losses in the microwave K_u band in magneto-electric nanocomposites