Determination of particle size distribution by FMR measurements

Folly, W.S.D.; Biasi, R.S. de

doi:10.1590/s0103-97332001000300009

Cited by 11 publications

(3 citation statements)

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“…The combined effects of size distribution and interparticle interactions on the magnetic behavior is very com-plex, because both affect the energy barriers of the system. Due to this complexity, the size distributions of such systems obtained by different magnetic methods 12,13,14,15 include both effects and may be considered as an 'effective size distributions'.…”

Section: Introductionmentioning

confidence: 99%

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Temperature dependence of the coercive field in single-domain particle systems

et al. 2004

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The magnetic properties of Cu97Co3 and Cu90Co10 granular alloys were measured over a wide temperature range (2 to 300 K). The measurements show an unusual temperature dependence of the coercive field. A generalized model is proposed and explains well the experimental behavior over a wide temperature range. The coexistence of blocked and unblocked particles for a given temperature rises difficulties that are solved here by introducing a temperature dependent blocking temperature. An empirical factor gamma (γ) arise from the model and is directly related to the particle interactions. The proposed generalized model describes well the experimental results and can be applied to other single-domain particle system.

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Section: Introductionmentioning

confidence: 99%

“…Due to this complexity, the size distributions of such systems obtained by different magnetic methods 12,13,14,15 include both effects and may be considered as an 'effective size distributions'.…”

mentioning

confidence: 99%

Temperature dependence of the coercive field in single-domain particle systems

et al. 2004

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“…The resonance signal at g = 2.0 corresponds to Mn 2+ ions in a medium close to octahedral symmetry. Signals at g = 3.9 and 4.3 are attributed to Mn 2+ ions in the local, tetrahedrally distorted rhombic field of oxygen ions [13,14].…”

Section: Resultsmentioning

confidence: 99%

Phase Composition and Catalytic Properties of MnNaW/SiO2 Oxide System in Oxidative Conversion of Methane

Ismailov¹,

Taghiyev²,

Zul’fugarova³

et al. 2022

Theor Exp Chem

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MnNaW/SiO 2 oxide system based on a mesoporous silica matrix synthesized using tetraethoxysilane and cetyltrimethylammonium bromide as precursors were prepared and characterized by SEM/EDS, XRD, EPR, N 2 adsorption-desorption measurements and studied in the oxidative conversion of methane (OCM). It is shown that MnNaW/SiO 2 catalyst consists of MnO x , Na 2 WO 4 , MnWO 4 , and SiO 2 phases. At the reaction temperature of 750-850°C the molten Na 2 WO 4 phase covers the surface of crystalline SiO 2 , and the interaction of MnO x , Na 2 WO 4 and SiO 2 matrix forms "liquid glass". It is assumed that Na 1-y MnO x particles formed as a result of the interaction of the system components during catalyst formation and characterized by the presence of ion-radical lattice oxygen are catalytically active sites in the OCM process.

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