Zur Darstellung der Europiumchalkogenide EuS, EuSe und EuTe

Pink, H.

doi:10.1002/zaac.19693640504

Cited by 17 publications

(2 citation statements)

References 7 publications

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“…The experimental data of figure 1 are well described by equation (1). According to the wet chemical procedure used to prepare the powder samples measured in this experiment [19] we can be sure that Eu and Sr atoms are distributed statistically. This is an important prerequisite for an interpretation of the experimental coefficients in equation ( 1) in terms of second-order and fourth-order interaction strengths [20].…”

Section: Eu X Sr 1−x Smentioning

confidence: 76%

The impact of fourth-order exchange interactions on the critical temperatures of Eu_xSr_1-xS and Eu_xSr_1-xTe

Köbler¹,

Fischer²

2000

J. Phys.: Condens. Matter

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The Curie phase line T C (x) of the diamagnetically diluted ferromagnets Eu x Sr 1−x S and the Néel phase line T N (x) of the diamagnetically diluted antiferromagnets Eu x Sr 1−x Te are analysed empirically on the basis of a meanfield approximation. Experimental data for the transition temperatures are collected from neutron scattering, magnetic specific heat and susceptibility measurements. Neither phase line, T C (x) or T N (x), is proportional to the concentration x of the magnetic atoms. It is shown that the deviations from linearity correlate with the fourth-order interaction sum in the paramagnetic phase. We therefore also ascribe the nonlinear x dependence of both phase lines to fourth-order interactions. Furthermore, our zero field neutron scattering measurements show that even for the strongly diluted Eu x Sr 1−x S samples the order parameters exhibit a T 2 Bloch law at low temperatures instead of a T 3/2 law. The T 2 law is a characteristic signature of fourth-order interactions in 3D materials with half-integral spin. It is also observed that the critical exponent β of the order parameter changes from β = 0.5 for x = 1 towards β = 1 at about x 2/3. This confirms that a new universality class is reached for a random distribution of magnetic moments. However, all phase transitions are first order and the critical power law applies only for the continuous part of the rise in the order parameter.

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Section: Eu X Sr 1−x Smentioning

confidence: 76%

The impact of fourth-order exchange interactions on the critical temperatures of Eu_xSr_1-xS and Eu_xSr_1-xTe

Köbler¹,

Fischer²

2000

J. Phys.: Condens. Matter

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“…EuS e.g. has been prepared (a) from the elements [1][2][3], (b) from Eu 2 0 3 and CS 2 [4], (c) from Eu-oxalate [5], -citrate [6], -sulfate [7], -sulfite [8], -chloride [9] or oxide [10,11] and H 2 S, (d) from EUSC>4 and C [5]. Such samples exhibit different physical properties like the conductivity [1,10], which are sensitive to small changes in stoichiometry.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium of EuS with Gas Mixtures of H₂S,H₂ and CO₂

Hauck

1981

Zeitschrift Für Naturforschung A

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EuS and EU2O3 powder samples were equilibrated with H2S-H2-CO2 gas mixtures in the temperature range 700-1500 °C. Since the sulfur and oxygen fugacities of the gas mixtures -as calculated from thermodynamic data -can vary by about 10 7 , EuS of different stoichiometrics may be produced. At higher oxygen and lower sulfur fugacities EuS is oxidized to EU2O2S. The border line between the two phases can be fitted by the equation log(/(S2)/atm.) = 2 log(/(02)/ atm.) + 48300/7' -9.3 and compared to border lines of other phases of the Eu-O-S system, which can be calculated from thermodynamic data.

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Darstellung und Eigenschaften gemischter Sulfide der 4f‐Übergangselemente

Pink

1969

Angewandte Chemie

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Untersuchungen uber die Reaktivitat thermalisierter Elektronen in der Gasphase wurden rnit zwei Methoden in Angriff genommen. In einem Experiment werden die Elektronenreaktionen rnit einein Mikrowelleninterferometer verfolgt. Zur Ionisation dient eine gepulste Elektronenquelle. die 600-kV-Elektronen liefert. Die Anordnung gestattet die Messung von 1011 bis 5x1013 Elektronen/cm3 und deren zeitliche Veranderung mit einer Zeitauflosung von besser als 10-7 s. Um Aussagen machen zu konnen, die fur den Strahlenchemiker von Interesse sind, wird bei Drucken bis zu 200 Torr gearbeitet. Bei den fur strahlenchemische Verhaltnisse relativ hohen Elektronen-und Ionendichten, die in dieser Anordnung erzeugt werden, uberwiegt in den meisten Fallen eine Kombination der Ionen mit den Elektronen. Neben G e schwindigkeitskonstanten fur Rekombinationsreaktionen werden solche fur die Reaktion von Elektronen mit typischen Elektronenfangern wie 0 2 und SF6 angegeben.

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Zur Darstellung der Europiumchalkogenide EuS, EuSe und EuTe

Cited by 17 publications

References 7 publications

The impact of fourth-order exchange interactions on the critical temperatures of Eu_xSr_1-xS and Eu_xSr_1-xTe

The impact of fourth-order exchange interactions on the critical temperatures of Eu_xSr_1-xS and Eu_xSr_1-xTe

Equilibrium of EuS with Gas Mixtures of H₂S,H₂ and CO₂

Darstellung und Eigenschaften gemischter Sulfide der 4f‐Übergangselemente

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Zur Darstellung der Europiumchalkogenide EuS, EuSe und EuTe

Cited by 17 publications

References 7 publications

The impact of fourth-order exchange interactions on the critical temperatures of EuxSr1-xS and EuxSr1-xTe

The impact of fourth-order exchange interactions on the critical temperatures of EuxSr1-xS and EuxSr1-xTe

Equilibrium of EuS with Gas Mixtures of H2S,H2 and CO2

Darstellung und Eigenschaften gemischter Sulfide der 4f‐Übergangselemente

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The impact of fourth-order exchange interactions on the critical temperatures of Eu_xSr_1-xS and Eu_xSr_1-xTe

The impact of fourth-order exchange interactions on the critical temperatures of Eu_xSr_1-xS and Eu_xSr_1-xTe

Equilibrium of EuS with Gas Mixtures of H₂S,H₂ and CO₂