The influence of heat-treatment on microstructure and magnetic properties of rare-earth substituted SrFe12O19

Rezlescu, N.; Doroftei, C.; Rezlescu, E.; Popa, P.D.

doi:10.1016/j.jallcom.2007.04.102

Cited by 109 publications

(42 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The chemical precursors used for these experiments were Fe(NO 3 ) 3 · 9H 2 O, SrCO 3 , Nd 2 O 3 , Co(CH 3 COO) 2 · 4 H 2 O, as it was earlier reported [7,8]. The ratio citric:nitric acid was fixed in 2:1 for each experiment.…”

Section: Methodsmentioning

confidence: 99%

Mössbauer analysis of Nd-Co M-type strontium hexaferrite powders with different iron content

et al. 2009

View full text Add to dashboard Cite

The structural analysis of strontium hexaferrites SrFe x O 19 (for x = 12, 11 and 10) and substituted samples Sr 0.7 Nd 0.3 Fe 12−y Co 0.3 O 19 (for y = 0.3, 1.3 and 2.3) prepared through the citrate precursor method is shown. Nd and Co substitution modifies saturation magnetization (M S ) and increases coercivity (H c ) in samples heat-treated at 1100 • C for two hours. Mössbauer analyses show different iron occupancy and the influence of the Fe 3+ content is particularly emphasized. Hematite segregation is observed for some compositions. Samples with low Fe 3+ content show the best magnetic properties with no secondary phase segregation.

show abstract

Section: Methodsmentioning

confidence: 99%

Mössbauer analysis of Nd-Co M-type strontium hexaferrite powders with different iron content

et al. 2009

View full text Add to dashboard Cite

show abstract

“…The magnetic dilution and spin canting disrupt and weaken the Fe +3 -O-Fe +3 exchange interaction by Fe +2 ions and promote lower M s . We have measured the reflection loss of the samples in the X (8-12 GHz) and Ku (12)(13)(14)(15)(16)(17)(18) bands. According to transmittance line theory, the reflection loss of electromagnetic wave under normal incident wave in the case of a metal-back single layer is given by…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…To vary the magnetic properties of M-type hexaferrites, rare earth elements are very unique because of their characteristic structure of electronic shells. The Lanthanides also improve the mechanical properties and hard magnetic properties of hexagonal ferrites [13,14].…”

mentioning

confidence: 99%

Structural, Magnetic and Microwave Properties of Eu-doped Barium Hexaferrite Powders

Khademi

Poorbafrani

Kameli

et al. 2011

J Supercond Nov Magn

View full text Add to dashboard Cite

Eu-doped M-type barium ferrite powders (Ba 1−x Eu x Fe 12 O 19 ) with x = 0.0, 0.1, 0.2 and 0.25 were prepared by sol-gel method. The synthesized samples are characterized by thermo gravimetric analysis (TG-DTA), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), vibrating sample magnetometer (VSM) and vector network analyzer. All the synthesized samples have the nearly singlemagnetoplumbite phase. The results show that the crystallite size of doped samples is smaller than pure one. The saturation magnetization of doped ferrites decreases by the increase in Eu doping, while the coercivity increases. Maximum coercivity achieved in this study is 6.12 KOe for x = 0.25 sample. The enhancement of coercivity by Eu doping is mainly due to the higher magnetocrystalline anisotropy, which is attributed to the partial change of Fe +3 ion to Fe +2 ion. The maximum reflection loss (RL) of −43 dB at frequency range of 12-18 GHz for the x = 0.1 sample was obtained. The increase in reflection loss at higher frequency suggests that the Eu-doped sample can be used for the application in microwave devices.

show abstract

“…sublattices, namely tetrahedral (4f1), trigonal bipyramidal (2b) and octahedral (12k, 2a and 4f2) of hexagonal structure [5]. Various researchers doped different metals and combinations of various metal cations to improve the properties of strontium hexaferrites and to make the materials suitable for different applications [5][6][7][8][9][10][11][12][13][14] Hooda et al synthesized strontium hexaferrite (SrM) and its modified systems by solid-state technique. They represented the electric transport phenomena of these systems by impedance and modulus formalizes.…”

Section: Introductionmentioning

confidence: 99%

Effect of grain size on electric transport and magnetic behavior of strontium hexaferrite (SrFe12O19)

et al. 2016

View full text Add to dashboard Cite

Polycrystalline M-type hexagonal strontium hexaferrite (SrFe 12 O 19 ) was prepared by conventional ceramic route (LG SrM) and auto combustion (SG SrM) method. The single-phase pattern and well grain growth was confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The average crystalline size is found to be 41.35 nm in LG SrM, while that of SG SrM is 36.87 nm. In this report, the electric transport behavior of LG SrM and SG SrM (SrFe 12 O 19 ) was successfully investigated and the analysis is done in the frequency range 100 Hz to 1 MHz at temperature 30-200°C. The relaxation behavior was examined by considering the impedance and modulus formalism in order to investigate the grain and grain boundary and surface polarization conduction process. The magnetic properties such as saturation magnetization, remanence, coercivity and anisotropy field are calculated from the hysteresis loop measurement. It was found that the saturation magnetization gets increased in LG SrM as compared to SG SrM system while the coercivity of SG SrM is greater than that of LG SrM.

show abstract

The influence of heat-treatment on microstructure and magnetic properties of rare-earth substituted SrFe12O19

Cited by 109 publications

References 10 publications

Mössbauer analysis of Nd-Co M-type strontium hexaferrite powders with different iron content

Mössbauer analysis of Nd-Co M-type strontium hexaferrite powders with different iron content

Structural, Magnetic and Microwave Properties of Eu-doped Barium Hexaferrite Powders

Effect of grain size on electric transport and magnetic behavior of strontium hexaferrite (SrFe12O19)

Contact Info

Product

Resources

About