X-ray diffraction and Mössbauer spectra of the system Fe2O3-Eu2O3

Ristić, Mira; Popović, Stanko; Musić, Svetozar

doi:10.1007/bf00722156

Cited by 17 publications

(8 citation statements)

References 14 publications

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“…Mössbauer room temperature experimental spectra of LnFeO 3 are illustrated in Figure with their calculated spectra, while the hyperfine parameters are gathered in Table . For the three compounds, the major contribution is described by the presence of a magnetically ordered sextet . The refined values of the hyperfine parameters are consistent with high‐spin iron(III) ions located at a crystallographic site in octahedral symmetry (site 1) in good agreement with the perovskite structure of these compounds.…”

Section: Resultssupporting

confidence: 62%

Synthesis and Characterization of Rare‐Earth Orthoferrite LnFeO₃ Nanoparticles for Bioimaging

et al. 2018

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A combination of sol-gel synthesis and thermal decomposition was developed for preparing nanosized, perovskite-type LnFeO 3 (Ln = Eu, Gd, Tb) powders. Perovskite-type powders with crystalline particles of 100 nm average size, as determined by transmission electron microscopy (TEM), could be obtained after a thermal treatment at 800°C. The perovskite nanoparticles (NPs) were further characterized by X-ray powder diffraction and Mössbauer spectroscopy. These were in agreement with the pure perovskite LnFeO 3 structure with the expected Zeeman sextet corresponding to a magnetically ordered [a]

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Section: Resultssupporting

confidence: 62%

Synthesis and Characterization of Rare‐Earth Orthoferrite LnFeO₃ Nanoparticles for Bioimaging

et al. 2018

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“…Rare earth ferrimagnetic materials are used in telecommunication industries [1]. The rare-earth ferrites are part of magnetic industry due to their high electrical resistivity and low eddy current losses [2]. Lithium ferrites play vital role in magnetic and microwave industries.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dopants Mn2+ and Cd2+ Concentration on Electrical and Magnetic Properties of Li-Mixed Spinel Nanoferrites

Faraz

Ahmad

2011

J Supercond Nov Magn

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Spinel mixed Li-ferrites with incorporation of various dopants (Cd 2+ and Ni 2+ ) concentration in ranges 0.00 ≤ x ≤ 0.80 are prepared using sol-gel technique. The various phases, lattice constant/parameter, X-ray density and crystallite size are confirmed using X-ray diffraction (XRD). The particle size and lattice parameters are found in the range 15-33 nm and 8.35-8.66 Å. This confirmed that incorporating dopant strongly influences the material structure and an increase is observed in lattice parameter and particle size with increase in dopant concentration. The structure is influenced by the dopant position, at the octahedral (B) and tetrahedral (A) sites. The decrease in activation energy (E) is observed with increase in dopant concentration. Furthermore, analysis of the crystallite size and morphology is done using scanning electron microscopy (SEM), which confirmed that the observed particle size is comparable with the X-ray diffraction (XRD) results. The dopant affects electrical properties such as dc electrical resistivity and drift mobility. The observed trend for drift mobility and dc electrical resistivity confirmed the semiconducting behavior of the synthesized material. The magnetic parameters saturation magnetization (M s ), remanence (M r ) and coercivity (H c ) are strongly affected by dopant concentration. A sudden increase in magnetic parameters M r and M s is observed A. Faraz ( ) Thermal Transport Laboratory (TTL), School of chemical and materials Engineering (by incorporating a small amount of dopant up to x = 0.40 and with further incorporation cause a decrease in the values of these parameters due to the non-magnetic behavior of incorporating dopant Cd 2+ ions. These decreases in values can be explained using the spin canted model and cations positioning at tetrahedral (A) and octahedral (B) sites. The decrease in Curie temperature, observed with increase in dopant incorporation, is due to the decrease/weakening interaction between tetrahedral (A) and octahedral (B) sites.

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“…The doping methods have been applied in a series of author's studies, among others, in the study of the phase transition in titanium dioxide [18,19], biomineralization processes in the oyster Ostrea edulis [20,21], crystalline phases in intermetallic oxides [22][23][24][25][26][27], precipitation processes in Al-Zn alloys [11][12][13]19].…”

Section: Selected Studies With Application Of Doping Methodsmentioning

confidence: 99%

“…are replaced by other cations, have been systematically investigated by XRD, TEM, FE SEM, FTIR, and Mössbauer spectroscopies and other supplementary techniques (collaboration with S. Musić, M. Ristić, G. Štefanić, Ruđer Bošković Institute, Zagreb) in order to study formation of oxide phases and solid solutions, crystallinity, (nano)crystallite size, strain in the crystallites, properties at HT, phase transitions, and phase diagrams vs. physical and chemical properties. As an example of those studies, the systems α-Fe 2 O 3 -Ln 2 O 3 , Ln = Eu, Gd, are described shortly [22][23][24][25][26][27].…”

Section: Crystalline Phases In Intermetallic Oxidesmentioning

confidence: 99%

“…Molar fractions of the observed crystalline phases (at RT), estimated by the application of the doping method (i), as a function of the initial molar fractions of α-Fe 2 O 3 and Ln 2 O 3 , are shown inFigure 6. Experimental procedures and obtained results, as well as the crystal data of the phases appearing in the systems α-Fe 2 O 3 -Ln 2 O 3 (at RT) are given in detail in References[22][23][24][25][26][27].…”

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confidence: 99%

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Quantitative Phase Analysis by X-ray Diffraction—Doping Methods and Applications

Popović

2020

Crystals

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X-ray powder diffraction is an ideal technique for the quantitative analysis of a multiphase sample. The intensities of diffraction lines of a phase in a multiphase sample are proportional to the phase fraction and the quantitative analysis can be obtained if the correction for the absorption of X-rays in the sample is performed. Simple procedures of quantitative X-ray diffraction phase analysis of a multiphase sample are presented. The matrix-flushing method, with the application of reference intensities, yields the relationship between the intensity and phase fraction free from the absorption effect, thus, shunting calibration curves or internal standard procedures. Special attention is paid to the doping methods: (i) simultaneous determination of the fractions of several phases using a single doping and (ii) determination of the fraction of the dominant phase. The conditions to minimize systematic errors are discussed. The problem of overlapping of diffraction lines can be overcome by combining the doping method (i) and the individual profile fitting method, thus performing the quantitative phase analysis without the reference to structural models of particular phases. Recent suggestions in quantitative phase analysis are quoted, e.g., in study of the decomposition of supersaturated solid solutions-intermetallic alloys. Round Robin on Quantitative Phase Analysis, organized by the IUCr Commission on Powder Diffraction, is discussed shortly. The doping methods have been applied in various studies, e.g., phase transitions in titanium dioxide, biomineralization processes, and phases in intermetallic oxide systems and intermetallic alloys.

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X-ray diffraction and Mössbauer spectra of the system Fe2O3-Eu2O3

Cited by 17 publications

References 14 publications

Synthesis and Characterization of Rare‐Earth Orthoferrite LnFeO₃ Nanoparticles for Bioimaging

Synthesis and Characterization of Rare‐Earth Orthoferrite LnFeO₃ Nanoparticles for Bioimaging

Effect of Dopants Mn2+ and Cd2+ Concentration on Electrical and Magnetic Properties of Li-Mixed Spinel Nanoferrites

Quantitative Phase Analysis by X-ray Diffraction—Doping Methods and Applications

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X-ray diffraction and Mössbauer spectra of the system Fe2O3-Eu2O3

Cited by 17 publications

References 14 publications

Synthesis and Characterization of Rare‐Earth Orthoferrite LnFeO3 Nanoparticles for Bioimaging

Synthesis and Characterization of Rare‐Earth Orthoferrite LnFeO3 Nanoparticles for Bioimaging

Effect of Dopants Mn2+ and Cd2+ Concentration on Electrical and Magnetic Properties of Li-Mixed Spinel Nanoferrites

Quantitative Phase Analysis by X-ray Diffraction—Doping Methods and Applications

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Synthesis and Characterization of Rare‐Earth Orthoferrite LnFeO₃ Nanoparticles for Bioimaging

Synthesis and Characterization of Rare‐Earth Orthoferrite LnFeO₃ Nanoparticles for Bioimaging