Energy Transfer

Blasse, G.; Grabmaier, B. C.

doi:10.1007/978-3-642-79017-1_5

Cited by 80 publications

(102 citation statements)

References 6 publications

(3 reference statements)

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“…The first from x = 0 to 0.3 and the second from x = 0.4 to 0.6. This difference in the lattice parameter may be explained by the cation migration since Zn 2+ ions on the A-sites exhibit a smaller ionic radius than on the B-sites because of covalence effects [6]. The remarkable effect, that the anomaly shift, due to the redistribution of the cations.…”

Section: X-ray Analysis and Densitymentioning

confidence: 97%

“…The basic ferrite MgFe 2 O 4 (x = 0) is known as inverse ferrite, where Mg 2+ ions are located on B-sites. But there is a probability of a small fraction (y) of Mg 2+ ions can be migrate to A-sites [6] ,in this case it may be considered as a partly inverse ferrite, then the cation distribution can be represented as:…”

Section: Magnetization and B-h Loopmentioning

confidence: 99%

“…Magnesium ferrite requires high sintering temperatures of the order of 1350 o C to achieve the desired control on the Mg 2+ ions distribution on octahedral and tetrahedral sites [5]. The cation distribution of slowly cooled magnesium ferrite was reported by Blasse [6] . Most of Mg 2+ ions are located on B-sites and small fraction migrate to A-sites.…”

Section: Introductionmentioning

confidence: 98%

“…In order to study the influence of Zn 2+ ion on the structure and magnetic properties of magnesium ferrite, the composition of mixed ferrite Mg x Zn 1-x Fe 2 O 4 (x = 0 -→0.6) have been prepared and reported in the present work. It is well known that the Zn 2+ ions show a preference for the tetrahedral sites (Asites) of the spinel lattice [6,7]. So that, the distribution of cations are over octahedral and tetrahedral sites determines to a great extent the physical properties.…”

Section: Introductionmentioning

confidence: 99%

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Some physical and magnetic properties of Mg‐Zn ferrite

Mazen

Mansour

Zaki³

2003

Cryst. Res. Technol.

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Some physical properties (such as lattice parameter, density and porosity) and magnetic properties of the system Mg 1-x Zn x Fe 2 O 4 ; where x=0,0.1,0.2,0.3,0.4,0.5and 0.6 have been studied. It was found that the lattice parameter increases with increasing the zinc concentration. The composition dependence of the physical properties is divided into two regions. The first one is for x ≤ 0.3 and the second one is for x > 0.3. From the magnetization measurements, the basic composition (MgFe 2 O 4 ) shows the lowest magnetization, while the composition of x=0.4 shows the highest one. The behaviour of magnetization M versus composition shows also two regions for x <>0.3. The behaviour of M versus x was discussed in the bases of cation distribution. From the B-H loops, the remanence induction B r , saturation induction B s and the coercive force H c were determined and studied with x. The Curie temperature T C was determined from the measurements of the initial permeability µ i versus temperature. It was found T C decreases with increasing Zn-content. Also

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Section: X-ray Analysis and Densitymentioning

confidence: 97%

Section: Magnetization and B-h Loopmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Some physical and magnetic properties of Mg‐Zn ferrite

Mazen

Mansour

Zaki³

2003

Cryst. Res. Technol.

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“…The high level emission ( 5 D 3 ) is quenched by cross relaxation in favour of the 5 D 4 emission due to high concentration of Tb 3+ in the compound 17 . The shortest estimated Tb-Tb distance (~5.36 Å) suggests that exchange interaction becomes ineffective and luminescence is predicted to become efficient 17 , making the NaBaTb(BO 3 ) 2 compound a promising green-emitting phosphor material.…”

Section: Referencesmentioning

confidence: 99%

Synthesis of New Isostructural Orthoborates NaBaR(BO3)2 with R = Tb, Dy, Ho, Er, Tm and Lu

et al. 2016

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Six new rare-earth orthoborates NaBaR(BO 3 ) 2 , with R = Tb, Dy, Ho, Er, Tm, Lu were synthesized using a multiple-step solid-state reaction. These new orthoborates continue the previously described isostructural lines of three-cation orthoborates NaBaR(BO 3 ) 2 , by R = Sc, Y, Yb. The structure of synthesized solid compounds is isotypic with the mineral eitelite, Na2Mg(CO 3 ) 2 , crystallizing in the trigonal system with space group R3̅ . All prepared borates are isostructural, as evidenced by the presence of the same vibration modes in Raman spectra and of the same diffraction peaks in X-ray patterns. The photoluminescence of NaBaTb(BO 3 ) 2 have been investigated in a detail.

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Uranium luminescence in La₂Zr₂O₇: effect of concentration and annealing temperature

et al. 2016

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The speciation of a particular element in any given matrix is a prerequisite to understanding its solubility and leaching properties. In this context, speciation of uranium in lanthanum zirconate pyrochlore (La2Zr2O7 = LZO), prepared by a low‐temperature combustion route, was carried out using a simple photoluminescence lifetime technique. The LZO matrix is considered to be a potential ceramic host for fixing nuclear and actinide waste products generated during the nuclear fuel cycle. Special emphasis has been given to understanding the dynamics of the uranium species in the host as a function of annealing temperature and concentration. It was found that, in the LZO host, uranium is stabilized as the commonly encountered uranyl species (UO22+) up to a heat treatment of 500 °C at the surface. Above 500 °C, the uranyl ion is diffused into the matrix as the more symmetric octahedral uranate species (UO66–). The uranate ions thus formed replace the six‐coordinated ‘Zr’ atoms at regular lattice positions. Further, it was observed that concentration quenching takes place beyond 5 mol% of uranium doping. The mechanism of the quenching was found to be a multipolar interaction. Copyright © 2016 John Wiley & Sons, Ltd.

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Energy Transfer

Cited by 80 publications

References 6 publications

Some physical and magnetic properties of Mg‐Zn ferrite

Some physical and magnetic properties of Mg‐Zn ferrite

Synthesis of New Isostructural Orthoborates NaBaR(BO3)2 with R = Tb, Dy, Ho, Er, Tm and Lu

Uranium luminescence in La₂Zr₂O₇: effect of concentration and annealing temperature

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Energy Transfer

Cited by 80 publications

References 6 publications

Some physical and magnetic properties of Mg‐Zn ferrite

Some physical and magnetic properties of Mg‐Zn ferrite

Synthesis of New Isostructural Orthoborates NaBaR(BO3)2 with R = Tb, Dy, Ho, Er, Tm and Lu

Uranium luminescence in La2Zr2O7: effect of concentration and annealing temperature

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Product

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Uranium luminescence in La₂Zr₂O₇: effect of concentration and annealing temperature