Magnetic and structural properties of iron-based oxide glasses, Fe 2O3-BaO-B2O3, from 57Fe Mössbauer spectroscopy

Bonnenfant, A.; Friedt, J.M.; Maurer, M.; Sanchez, J.P.

doi:10.1051/jphys:0198200430100147500

Cited by 34 publications

(10 citation statements)

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“…An example which may perhaps illustrate case (B) is amorphous Fe 24 Zr 76 as a mean η ≈ 0.67±0.07 and prob(V zz > 0) = 1 were reported from Mössbauer spectra recorded in applied fields [7]. A mean η ≈ 0.5 and prob(V zz > 0) = 1 were reported from Mössbauer spectra of iron-based oxide glasses Fe 2 O 3 -BaO-B 2 O 3 recorded in applied fields [58]. The models discussed above may also be useful in other fields as shown for instance by recent EPR studies of glasses [37,62].…”

Section: Statistical Invariance By Rotationmentioning

confidence: 87%

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Spectroscopic Analysis of the 4p4d Configuration of Kr VII

et al. 2000

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Hyperfine studies of disordered materials often yield the distribution of the electric field gradient (EFG) or related quadrupole splitting (QS). The question of the structural information that may be extracted from such distributions has been considered for more than fifteen years. Experimentally most studies have been performed using Mössbauer spectroscopy, especially on 57 Fe. However, NMR, NQR, EPR and PAC methods have also received some attention. The EFG distribution for a random distribution of electric charges was for instance first investigated by Czjzek et al [1] and a general functional form was derived for the joint (bivariate) distribution of the principal EFG tensor component V zz and the asymmetry parameter η. The importance of the Gauss distribution for such rotationally invariant structural models was thus evidenced. Extensions of that model which are based on degenerate multivariate Gauss distributions for the elements of the EFG tensor were proposed by Czjzek. The latter extensions have been used since that time, more particularly in Mössbauer spectroscopy, under the name 'shell models'. The mathematical foundations of all the previous models are presented and critically discussed as they are evidenced by simple calculations in the case of the EFG tensor. The present article only focuses on those aspects of the EFG distribution in disordered solids which can be discussed without explicitly looking at particular physical mechanisms. We present studies of three different model systems. A reference model directly related to the first model of Czjzek, called the Gaussian isotropic model (GIM), is shown to be the limiting case for many different models with a large number of independent contributions to the EFG tensor and not restricted to a point-charge model. The extended validity of the marginal distribution of η in the GIM model is discussed. It is also shown that the second model based on degenerate multivariate normal distributions for the EFG components yields questionable results and has been exaggeratedly used in experimental studies. The latter models are further discussed in the light of new results. The problems raised by these extensions are due to the fact that the consequences of the statistical invariance by rotation of the EFG tensor have not been sufficiently taken into account. Further difficulties arise because the structural degrees of freedom of the disordered solid under consideration have been confused with the degrees of freedom of QS distributions. The relations which are derived and discussed are further illustrated by the case of the EFG tensor distribution created at the centre of a sphere by m charges randomly distributed on its surface. The third model, a simple extension of the GIM, considers the case of an EFG tensor which is the sum of a fixed part and of a random part with variable weights. The bivariate distribution f (V zz , η) is calculated exactly in the most symmetric case and the effect of the random part is investigated as a function of its weight. The vario...

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Section: Statistical Invariance By Rotationmentioning

confidence: 87%

“…However, as solely the QS distribution associated with equation (52) was derived [58], the final result does not depend on whether V 0 is rotated or not (section 4.3). The speed at which theṼ GI contribution dominates theṼ 0 one was also investigated by varying x.…”

Section: A Simple Extension Of the Gim Modelmentioning

confidence: 91%

Spectroscopic Analysis of the 4p4d Configuration of Kr VII

et al. 2000

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“…For this sample h (8.4 at % Fe), the saturated magnetic spectrum (1.4 K) is analysed in the hypothesis of an « amorphous » magnetic structure, using a fitting procedure described in detail in [10] (Fig. 6) : a " random orientation is assumed for the angle 0 between electric field gradient and hyperfine field principal axes.…”

Section: M6ssbauermentioning

confidence: 99%

“…The properties of the ternary oxide glasses, L'20-B203-Fe2o3, are inferred by combining bulk (ac-susceptibility, magnetization) and local (17 Fe Mossbauer spectroscopy) measurements. In a previous paper on the Ba0-B203-Fe203 glass systems [10] it has been shown that the magnetic properties are governed by the Fe concentration. Here, more attention is devoted to the dilute concentration range, where isolated Fe3 + ions coexist with small magnetic clusters, and to the intermediate concentration range, where the glasses exhibit a mictomagnetic transition owing to topological disorder and frustration effects.…”

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confidence: 99%

“…Absorbers containing about 5 mg/cm2 of natural iron were used. The Mossbauer spectra were computer analysed as described in detail in a preceding paper [10]. Complementary ac-susceptibility measurements as a function of temperature and frequency are reported for one specific sample e (5.8 at % Fe), in which the mictomagnetic transition is established in detail.…”

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confidence: 99%

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Magnetic properties of the ternary oxide glasses, Li2O-B2 O3-Fe2O3 from 57Fe Mössbauer spectroscopy

Sanchez¹,

Friedt²

1982

J. Phys. France

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Reçu le 13 avril 1982, révisé le 2 juillet, accepté le 22 juillet 1982)Résumé. 2014 L'état de valence et la coordination du fer ont été établis par spectroscopie Mössbauer de 57Fe dans les oxydes ternaires amorphes, Li2O-B2O3-Fe2O3. Dans la gamme de concentrations étudiée (~ 8,4 at % Fe), les ions Fe3+ sont tétraet hexacoordinés ; la faible proportion ( 15 %) d'ions Fe2+, observée dans certains échantillons, est liée aux conditions de préparation. Les propriétés magnétiques de ces verres, établies en combinant des mesures macroscopiques (susceptibilité dynamique et aimantation) et locales (spectroscopie Mössbauer), sont déterminées par la concentration des ions fer. A faible concentration (~ 3 at %) de fer, des ions Fe 3+ isolés coexistent avec des petits agrégats (2 à 3 atomes) antiferromagnétiques. Pour des teneurs en fer plus élevées (3,8 à 8,4 at %), les verres présentent une transition mictomagnétique conduisant à un ordre spéromagnétique. Dans un échantillon étudié en détail (5,8 at % Fe), la variation de la température de gel (Tf) avec la fréquence de mesure obéit à une loi de Fulcher.Abstract. 2014 57Fe Mössbauer spectroscopy has been combined with bulk magnetic measurements to determine the valence state and coordination of iron as well as the magnetic properties of the ternary oxide glasses, Li2O-B2O3-Fe2O3. In all investigated glasses (~ 8.4 at % Fe), the Fe3+ ions coexist in tetrahedral and octahedral coordinations ; the presence of Fe2+ ions ( 15 %), which is observed in some glasses, is related to preparation conditions. The magnetic properties of the glasses are governed by the iron content. At low iron concentration ( 3 at %), isolated Fe3+ ions coexist with antiferromagnetic dimers and trimers. At large iron content (3.8 to 8.4 at %) the glasses undergo a mictomagnetic transition to a speromagnetic ordered state. The freezing temperature (Tf), which is frequency dependent, is found to follow a Fulcher law in one sample (5.8 at % Fe) investigated in detail.

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Properties of Magnetically Ordered Microparticles in Borate Glasses

Степанов

Édelman

Kim

et al. 1987

Phys. Stat. Sol. (a)

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Magnetic and magnetooptic properties of magnetically ordered microparticles are studied in host borate glass with iron oxide addition made during synthesis. Composition of the particles is established, their sizes are estimated and their specific behaviour in the magnetic field is determiricti depending on the host glass compounds. $~CCJIeRoRalIhI MarHLlTHble €I MaTHATOOnTHYeCKlle CBoiICTBa M a r H L I T o y n o p R~O I I C H H €~l~MHKPOYaCTLlll B MaTpllUe 60paTHOro CTeKJla, H IcoTOpoe npll CHHTe3e BBoAHnCR OIFCLI:! srieneaa. OueHeHbr paa~epbr YacTMq, onpeaeneH M X cocTaB ti xapaK-rep IroBezeHIIcr II MBTHCITHOM IIOJIe B 3aBMCIIMOCTLI OT COOTHOIIIeHLIR KOMlIOlIeIIT OCIIOBIIOrO CTeKJla.

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Magnetic and structural properties of iron-based oxide glasses, Fe 2O3-BaO-B2O3, from 57Fe Mössbauer spectroscopy

Cited by 34 publications

References 40 publications

Spectroscopic Analysis of the 4p4d Configuration of Kr VII

Spectroscopic Analysis of the 4p4d Configuration of Kr VII

Magnetic properties of the ternary oxide glasses, Li2O-B2 O3-Fe2O3 from 57Fe Mössbauer spectroscopy

Properties of Magnetically Ordered Microparticles in Borate Glasses

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