Effect of Synthesis Method on Particle Size and Magnetic and Structural Properties of Co–Ni Ferrites

Sharmin, Sonia; Kita, Eiji; Kishimoto, Mikio; Latiff, Hawa; Yanagihara, Hideto

doi:10.1109/tmag.2018.2854919

Cited by 9 publications

(6 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We reported that a maximum coercive force of 519 kA/m and saturation magnetization of 60.4 A·m 2 /kg were obtained in CoNi spinel particles treated etching in hydrochloric acid as final stage. 18) We showed the partial paramagnetic behavior in co-precipitation samples and the perfect inverted spinel structure in CoNi ferrite particles after etching, from Mössbauer analyses. The defects in particles introduced by etching were expected to contribute the high coercive force.…”

Section: Introductionmentioning

confidence: 82%

“…considered to be unreacted residues showing paramagnetic behavior 18) and do not contribute to the magnetization. The coercive force is mainly attributed to the particles of size approximately 30 nm.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…We considered that the CoNi ferrite particles had the composition as shown by Fe 3+ 1.0 (Co 2+ 0.526 Ni 2+ 0.316 )Fe 3+ 1.105 □ 0.053 )O 4 . 18) Here, □ indicates vacancy. The composition suggests the existence of vacancies.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Structure and Magnetic Properties of Co–Ni Spinel Ferrite Particles Synthesized via Co-Precipitation and Hydrothermal Treatment at Different Temperatures

et al. 2019

Self Cite

View full text Add to dashboard Cite

CoNi spinel ferrite particles were synthesized via chemical co-precipitation and subsequently performed hydrothermal treatment at different temperatures. Fine particles of size with a few nanometers and spherical or cubic particles of size approximately 30 nm, which are responsible for magnetic properties, were obtained. The crystallite size obtained using the Scherrer equation was 2427 nm and showed no dependency on the hydrothermal treatment temperature unlike the apparent particle size observed using transmission electron microscopy. The coercive force showed a remarkable increase with the decrease in the hydrothermal treatment temperature from 141 kA/m at 240°C to 400 kA/m at 100120°C, in contrast to the decrease in magnetization from 60.0 Am 2 /kg at 240°C to 37.2 Am 2 /kg at 100°C. The specific composition of the CoNi spinel ferrite particles is expected to affect the high coercive force and the remarkable dependency of the coercive force on the hydrothermal treatment temperature. [

show abstract

Section: Introductionmentioning

confidence: 82%

Section: Magnetic Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Structure and Magnetic Properties of Co–Ni Spinel Ferrite Particles Synthesized via Co-Precipitation and Hydrothermal Treatment at Different Temperatures

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…We have been studying the mechanism generating a high coercive force in the Co-Ni spinel ferrite particles, with the particular intention of applying the particles to permanent magnets. 27,28) In that study, we reported a maximum coercive force of 519 kA m −1 and saturation magnetization of 60.4 Am 2 kg −1 in Co-Ni spinel particles that were synthesized through co-precipitation, hydrothermal treatment, and etching in hydrochloric acid (HCl). Moreover, our Mössbauer analyzes showed the perfect inverted spinel structure of particles.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, our Mössbauer analyzes showed the perfect inverted spinel structure of particles. 27) We considered that the insufficient occupation of cation ions in the A-or B-sites in spinel structure is responsible for the high coercive force.…”

Section: Introductionmentioning

confidence: 99%

Coercive force of Co–Ni–Li spinel ferrite particles synthesized through co-precipitation, hydrothermal treatment, and etching in hydrochloric acid

Kishimoto¹,

Kita²,

Yanagihara³

2020

Jpn. J. Appl. Phys.

Self Cite

View full text Add to dashboard Cite

Co–Ni and Co–Ni–Li spinel ferrite particles were synthesized via chemical co-precipitation, hydrothermal treatment, and etching in hydrochloric acid. The particles were approximately 30 nm in size and showed typical XRD patterns of spinel structure with a lattice constant of 0.838 nm, similar to that in Fe3O4 crystals. The coercive force was 227 kA m−1 and 508 kA m−1 for Co–Ni and Co–Ni–Li spinel ferrite particles, respectively. The magnetic anisotropy field in Co–Ni–Li spinel ferrite particles estimated from rotational hysteresis losses was remarkably higher than that of Co–Ni spinel ferrite particles. Although the A- and B-sites in the spinel structure were considered to have been filled by metal ions in both particles, the positive charge calculated from the composition of Co–Ni–Li spinel ferrite particles was smaller than that in the Co–Ni spinel ferrite particles. Some defects introduced in the particles due to the composition may give some effects on the high coercive force.

show abstract

Effect of etching on spin canting in hydrothermally synthesized Co-Ni ferrite particles

et al. 2019

View full text Add to dashboard Cite

Effect of Synthesis Method on Particle Size and Magnetic and Structural Properties of Co–Ni Ferrites

Cited by 9 publications

References 16 publications

Structure and Magnetic Properties of Co–Ni Spinel Ferrite Particles Synthesized via Co-Precipitation and Hydrothermal Treatment at Different Temperatures

Structure and Magnetic Properties of Co–Ni Spinel Ferrite Particles Synthesized via Co-Precipitation and Hydrothermal Treatment at Different Temperatures

Coercive force of Co–Ni–Li spinel ferrite particles synthesized through co-precipitation, hydrothermal treatment, and etching in hydrochloric acid

Effect of etching on spin canting in hydrothermally synthesized Co-Ni ferrite particles

Contact Info

Product

Resources

About