XRD, magnetic and Mössbauer spectral studies of nano size aluminum substituted cobalt ferrites (CoAlxFe2−xO4)

Singhal, Sonal; Barthwal, S. K.; Chandra, K.

doi:10.1016/j.jmmm.2006.03.023

Cited by 107 publications

(52 citation statements)

References 24 publications

(23 reference statements)

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“…Therefore, overall magnetization decreases as the substituent concentration increases in the spinel lattice. Mössbauer spectroscopy studies on aluminium-substituted cobalt ferrite revealed that Al does not have strong preference for either of the sites of the spinel lattice, but more aluminium resides in the B-site than at the A-site [24]. CoFe 2 O 4 is known to have a partially inverted spinel structure and the degree of inversion depends on the processing conditions [25].…”

Section: Magnetic Characterizationmentioning

confidence: 99%

Magnetic and magnetostrictive properties of aluminium substituted cobalt ferrite synthesized by citrate-gel method

Anantharamaiah

Joy

2015

J Mater Sci

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Structural, magnetic and magnetostrictive properties of sintered aluminium-substituted cobalt ferrite, CoAl x Fe 2-x O 4 (x = 0.0, 0.1, 0.20, 0.30), derived from nanosized powders synthesized by a citrate-gel method, have been investigated. The sample with x = 0.1 is found to exhibit higher maximum magnetostriction strain at relatively lower magnetic fields (230 ppm at 286 kA/m) than that obtained for the unsubstituted cobalt ferrite (217 ppm, at 446 kA/m). All the Al-substituted compositions show larger strain sensitivity (dk/dH) at low magnetic fields compared to that for the unsubstituted cobalt ferrite. The variation of the magnetostriction coefficient as well as the strain sensitivity with Al content is likely to be due to the changes in the cation distribution in the tetrahedral and octahedral sites of the spinel lattice along with the associated changes in the magnetocrystalline anisotropy. The magnetostriction coefficient of x = 0.1 could be further enhanced to 306 ppm (at 220 kA/m) after a magnetic field annealing at 300°C. A very high strain sensitivity of 4.5 9 10 -9 m/A is obtained for the magnetically annealed sample, larger than that reported for any substituted cobalt ferrite samples. The combination of high magnetostriction coefficient and strain sensitivity is suitable for device applications.

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Section: Magnetic Characterizationmentioning

confidence: 99%

Magnetic and magnetostrictive properties of aluminium substituted cobalt ferrite synthesized by citrate-gel method

Anantharamaiah

Joy

2015

J Mater Sci

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“…These materials are interesting due to their fascinating size dependent optical, electronic, magnetic, thermal, mechanical and chemical properties [1,2]. Cobalt ferrites have been regarded as one of the competitive candidates for high density magnetic recording media because of its moderate saturation magnetization, high coercivity, mechanical hardness and chemical stability [3]. Synthesis of nanoparticles, especially spinel ferrites, characterized by a low size distribution is important due to their remarkable electrical and magnetic properties and wide practical applications in information storage systems, ferro-fluid technology, magneto-caloric refrigeration and magnetic diagnostics [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of La3+ doping on the electric, dielectric and magnetic properties of cobalt ferrite processed by co-precipitation technique

Kumar

Sharma

Knobel

et al. 2010

Journal of Alloys and Compounds

149

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“…These materials are interesting due to their fascinating size dependent optical, electronic, magnetic, thermal, mechanical and chemical properties [1]. Cobalt ferrites have been regarded as one of the competitive candidates for high density magnetic recording media because of its moderate saturation magnetization, high coercivity, mechanical hardness and chemical stability [2]. Synthesis of nanoparticles, especially spinel ferrites, characterized by a small size distribution is important.…”

Section: Introductionmentioning

confidence: 99%

Investigations of lanthanum doping on magnetic properties of nano cobalt ferrites

et al. 2011

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The magnetic properties of nano-crystallite cobalt lanthanum ferrite (CoLa x Fe 2-x O 4 ) with varied quantities of lanthanum (x=0, 0.1, 0.15, 0.2, 0.25, 0.3) prepared by coprecipitation method have been studied by vibrating sample magnetometer (VSM) and LCR meter. X-ray diffraction (XRD) and transmission electron microscopy (TEM) confirmed the size, structure, and morphology of the ferrite samples. The average crystallite size varied from 17.83 nm to 49.99 nm. All the samples, although, in nano range, show significant hysteresis. The saturation magnetization (M s ) values decreased from 60.57 emu/g to 30.15 emu/g. The remanence (M R ) fell from 10.85 emu/g to 6.39 emu/g. Doping with lanthanum La 3+ ions modulates significantly the magnetic properties of cobalt spinel ferrites without sacrificing the ferromagnetic character.

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XRD, magnetic and Mössbauer spectral studies of nano size aluminum substituted cobalt ferrites (CoAlxFe2−xO4)

Cited by 107 publications

References 24 publications

Magnetic and magnetostrictive properties of aluminium substituted cobalt ferrite synthesized by citrate-gel method

Magnetic and magnetostrictive properties of aluminium substituted cobalt ferrite synthesized by citrate-gel method

Effect of La3+ doping on the electric, dielectric and magnetic properties of cobalt ferrite processed by co-precipitation technique

Investigations of lanthanum doping on magnetic properties of nano cobalt ferrites

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