Effect of high pressure on Mössbauer spectra of NiFe2O4 ultrafine particles with different grain sizes

Ma, Yan; Jin, Mingzhi; Liu, M.L; Chen, G; Sui, Yu; Tian, Yabin; Zhang, G.J; Jia, Yuqing

doi:10.1016/s0254-0584(00)00212-1

Cited by 31 publications

(12 citation statements)

References 9 publications

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“…It is clear that the contri- bution of surface region atoms is 42 % of total area of the experiment spectrum. This is in agreement with the percentage (44 %) of the volume of surface region atoms to the total volume of the particle with an average grain size (8 nm) by Ma et al [18]. The Mössbauer spectra recorded at 300 K after annealing at 1200 o C (Figure 4b) exhibit two normal zeeman split sextets due to the A-site Fe 3+ ions and other due to B-site Fe 3+ having hyperfine fields 500 and 484 kOe respectively, which indicates ferrimagnetic behaviour of the sample.…”

Section: Magnetic Measurementssupporting

confidence: 91%

Cation Distribution in Lithium Ferrite (LiFe5O8) Prepared via Aerosol Route

Singhal¹,

Chandra²

2010

JEMAA

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Section: Magnetic Measurementssupporting

confidence: 91%

Cation Distribution in Lithium Ferrite (LiFe5O8) Prepared via Aerosol Route

Singhal¹,

Chandra²

2010

JEMAA

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“…Spinel ferrite nanoparticles (SF-NPs) adopting the general A 2+ Fe2 3+ O4 formula with A = Ni [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], Ni-Zn [1,2,8,, Mn [1,[60][61][62], Co [1,60,61,[63][64][65][66][67][68][69][70][71][72][73], Co-Zn [74][75][76][77][78][79], Ni-Cu [43], Zn [80][81][82][83][84][85], Mn-Zn…”

Section: Introductionmentioning

confidence: 99%

Microstructural and magnetic characterization of Ni0.5Zn0.5Fe2O4 ferrite nanoparticles

Bajorek

Berger

Dulski

et al. 2019

Journal of Physics and Chemistry of Solids

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The comprehensive study of the Ni0.5Zn0.5Fe2O4 ferrite nanopowder crystallized in the inverse spinel structure and synthesized by co-precipitation method is presented. The distribution of Fe 3+ cations among tetrahedral and octahedral sites was confirmed. The microstructural investigations revealed the presence of ultrafine grained structure with an average crystallites size in the range of 14 ÷ 20 nm. Raman and Fourier-Transform Infrared (FTIR) spectroscopy studies confirmed typical spinel structure with tetrahedrally and octahedrally iron occupancy as well as indicate co-associated iron-oxide phases considered as factors responsible for the structural disorder. The magnetic properties revealed the superparamagnetic behavior at the room temperature with estimated critical size of single domain particles about 63 nm. The analysis of saturation magnetization pointed to the spin canting phenomenon in the surface layer. The valuation of exchange coupling parameters based on the mean field theory calculation strengthened the conclusion about opposite magnetization arrangement between tetrahedral and octahedral magnetic sublattices.

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“…In Fe 3 O 4 , the simple order-disorder model was abandoned after revealing new theoretical 13 and experimental results. 15 In Fig. For example, the smallness in particle size of the current Ni-Fe-O powders may affect the electric properties because spin correlation in NiFe 2 O 4 was changed with decreasing grain size or with decreasing isostatic pressure.…”

Section: Discussionmentioning

confidence: 99%

Novel Critical Temperature Resistor of Sintered Ni–Fe–O Nanosized Powders

et al. 2004

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Nanosized powders of Ni-Fe-O were synthesized by a pulsed wire discharge method and sintered at 600°C for 1 h in air. Abrupt electrical resistivity changes were observed in the temperature dependence of resistivity for the sintered Ni-Fe-O powders above 203°C. Similar resistivity curves, which had been observed in V-O samples and had been used for the critical temperature resistors, had never been reported in Ni-Fe-O samples. Possible mechanisms to explain the resistivity change in NiFe 2 O 4 , including order-disorder transition, semiconductor-metal transition, and surface spin pinning, are discussed.

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Effect of high pressure on Mössbauer spectra of NiFe2O4 ultrafine particles with different grain sizes

Cited by 31 publications

References 9 publications

Cation Distribution in Lithium Ferrite (LiFe5O8) Prepared via Aerosol Route

Cation Distribution in Lithium Ferrite (LiFe5O8) Prepared via Aerosol Route

Microstructural and magnetic characterization of Ni0.5Zn0.5Fe2O4 ferrite nanoparticles

Novel Critical Temperature Resistor of Sintered Ni–Fe–O Nanosized Powders

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