Magnetic interactions in rhenium-containing rare earth double perovskites Sr 2 LnReO 6 (Ln=rare earths)

Nishiyama, Atsuhide; Doi, Yoshihiro; Hinatsu, Yukio

doi:10.1016/j.jssc.2017.02.006

Cited by 13 publications

(5 citation statements)

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“…The theoretical magnetic moment can further be calculated by using the results obtained from the XPS data. The observed effective magnetic moments (μ observed ) are in good agreement with the corresponding effective magnetic moment calculated (μ theoretical ) by considering the various spin moments obtained from the XPS analysis. − It was observed that the difference between μ observed and μ theoretical values were found to increase as the value of x increases, which could be attributed to an increased value of the magnetic moment of the Ru 4+ ion, as the value of x increases with the decrease in oxygen vacancy observed from EPR studies . It was observed that due to oxygen defect strain induced hybridization of Ru 4d and O 2p there is a disruption of orbital quenching that results in an increased magnetic moment of Ru 4+ (high spin), especially for lower values of x .…”

Section: Resultssupporting

confidence: 76%

Investigation of Photoelectrocatalytic and Magnetic Properties of Sr₂YbRu_1–xTa_xO₆ (x = 0, 0.25, 0.5, 0.75, and 1)

et al. 2023

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We report the effect of substitution of Ru by Ta in Sr 2 YbRuO 6 on its magnetic and photoelectrocatalytic properties. The powder X-ray diffraction data, was satisfactorily refined in the monoclinic space group, P2 1 /n. The DC magnetization studies indicated that Sr 2 YbRuO 6 shows antiferromagnetic interaction through Yb−O−Ru orbital ordering, with the highest Weiss temperature, among Sr 2 YbRu 1−x Ta x O 6 (x = 0, 0.25, 0.5, and 0.75) which have values of −148, −125, −118, and −102 K, respectively. The difference in observed and theoretical magnetic moments was found to increase as x increases. It was also observed that with the increase of Ta concentration in Sr 2 YbRu 1−x Ta x O 6 , the band gap increased almost linearly, from 1.78(1) eV (x = 0) to 2.08(1) (x = 0.75), and thereafter a sharp increase 2.65(1) eV (x = 1) was observed, with the lowering of energy level of valence band, along with disruption in orbital ordering as x increases. The photoelectrocatalytic oxygen evolution reaction (OER) studies carried out on the series yield a maximum photocurrent density of 17 μA/cm 2 and photoresponse current of 5.5 μA/cm 2 at 0.8 V at an onset potential at 0.29 V vs Ag/AgCl for Sr 2 YbRuO 6 . The XPS analysis showed Ta and Ru to be in +5/+4 oxidation states, with the highest concentration of Ru 4+ ion observed for Sr 2 YbRuO 6 . The presence of oxygen vacancies was confirmed by XPS as well as EPR studies.Article pubs.acs.org/IC

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Section: Resultssupporting

confidence: 76%

Investigation of Photoelectrocatalytic and Magnetic Properties of Sr₂YbRu_1–xTa_xO₆ (x = 0, 0.25, 0.5, 0.75, and 1)

et al. 2023

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“…Unpaired f electrons determine not only the valence characteristics of rare-earth elements and spectroscopic parameters of their compounds, but also magnetic properties. Accordingly, in many REE compounds, paramagnetic and ferromagnetic effects were observed [31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure, Vibrational, Spectroscopic and Thermochemical Properties of Double Sulfate Crystalline Hydrate [CsEu(H2O)3(SO4)2]·H2O and Its Thermal Dehydration Product CsEu(SO4)2

et al. 2021

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Crystalline hydrate of double cesium europium sulfate [CsEu(H2O)3(SO4)2]·H2O was synthesized by the crystallization from an aqueous solution containing equimolar amounts of 1Cs+:1Eu3+:2SO42− ions. Anhydrous salt CsEu(SO4)2 was formed as a result of the thermal dehydration of the crystallohydrate. The unusual effects observed during the thermal dehydration were attributed to the specific coordination of water molecules in the [CsEu(H2O)3(SO4)2]·H2O structure. The crystal structure of [CsEu(H2O)3(SO4)2]·H2O was determined by a single crystal X-ray diffraction analysis, and the crystal structure of CsEu(SO4)2 was obtained by the Rietveld method. [CsEu(H2O)3(SO4)2]·H2O crystallizes in the monoclinic system, space group P21/c (a = 6.5574(1) Å, b = 19.0733(3) Å, c = 8.8364(2) Å, β = 93.931(1)°, V = 1102.58(3) Å3). The anhydrous sulfate CsEu(SO4)2 formed as a result of the thermal destruction crystallizes in the monoclinic system, space group C2/c (a = 14.327(1) Å, b = 5.3838(4) Å, c = 9.5104(6) Å, β = 101.979(3) °, V = 717.58(9) Å3). The vibration properties of the compounds are fully consistent with the structural models and are mainly determined by the deformation of non-rigid structural elements, such as H2O and SO42−. As shown by the diffused reflection spectra measurements and DFT calculations, the structural transformation from [CsEu(H2O)3(SO4)2]·H2O to CsEu(SO4)2 induced a significant band gap reduction. A noticeable difference of the luminescence spectra between cesium europium sulfate and cesium europium sulfate hydrate is detected and explained by the variation of the extent of local symmetry violation at the crystallographic sites occupied by Eu3+ ions, namely, by the increase in inversion asymmetry in [CsEu(H2O)3(SO4)2]·H2O and the increase in mirror asymmetry in CsEu(SO4)2. The chemical shift of the 5D0 energy level in cesium europium sulfate hydrate, with respect to cesium europium sulfate, is associated with the presence of H2O molecules in the vicinity of Eu3+ ion.

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“…Similar results have been observed in some Ln 3 ReO 7 compounds 14),15) and Re 5+ -containing compounds. 44), 45) In the following, we will evaluate the magnetic specific heat for Y 3 ReO 7 . The magnetic specific heat (C mag ) was estimated by extracting the lattice specific heat (C lat ) from the total specific heat (C p ).…”

Section: Magnetic Properties 321 Y 3 Reomentioning

confidence: 99%

Magnetic properties of rare earth rhenium oxides Ln3ReO7 (Ln = Y, Er–Lu) with fluorite-related structure

Inabayashi

Doi

Wakeshima

et al. 2018

J. Ceram. Soc. Japan

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Ternary rare earth rhenium oxides Ln 3 ReO 7 (Ln = Y, ErLu) have been prepared. Their X-ray diffraction measurements and the Rietveld analysis show that these compounds have an orthorhombic superstructure of fluorite-type with space group C222 1 (for Ln = Y, Er, Tm) or a defect-fluorite structure Fm 3m (for Ln = Yb, Lu). The zero-field-cooling and field-cooling magnetic susceptibility for Y 3 ReO 7 diverse when the temperature is decreased through 10 K. At the same temperature, specific heat anomaly is also observed. The results of the specific heat measurements for Tm 3 ReO 7 and Yb 3 ReO 7 indicate the existence of magnetic anomaly below 7 and 2.2 K, respectively. On the other hand, Er 3 ReO 7 and Lu 3 ReO 7 are paramagnetic down to 1.8 K.

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Magnetic interactions in rhenium-containing rare earth double perovskites Sr 2 LnReO 6 (Ln=rare earths)

Cited by 13 publications

References 41 publications

Investigation of Photoelectrocatalytic and Magnetic Properties of Sr₂YbRu_1–xTa_xO₆ (x = 0, 0.25, 0.5, 0.75, and 1)

Investigation of Photoelectrocatalytic and Magnetic Properties of Sr₂YbRu_1–xTa_xO₆ (x = 0, 0.25, 0.5, 0.75, and 1)

Crystal Structure, Vibrational, Spectroscopic and Thermochemical Properties of Double Sulfate Crystalline Hydrate [CsEu(H2O)3(SO4)2]·H2O and Its Thermal Dehydration Product CsEu(SO4)2

Magnetic properties of rare earth rhenium oxides <i>Ln</i><sub>3</sub>ReO<sub>7</sub> (<i>Ln</i> = Y, Er–Lu) with fluorite-related structure

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Magnetic interactions in rhenium-containing rare earth double perovskites Sr 2 LnReO 6 (Ln=rare earths)

Cited by 13 publications

References 41 publications

Investigation of Photoelectrocatalytic and Magnetic Properties of Sr2YbRu1–xTaxO6 (x = 0, 0.25, 0.5, 0.75, and 1)

Investigation of Photoelectrocatalytic and Magnetic Properties of Sr2YbRu1–xTaxO6 (x = 0, 0.25, 0.5, 0.75, and 1)

Crystal Structure, Vibrational, Spectroscopic and Thermochemical Properties of Double Sulfate Crystalline Hydrate [CsEu(H2O)3(SO4)2]·H2O and Its Thermal Dehydration Product CsEu(SO4)2

Magnetic properties of rare earth rhenium oxides <i>Ln</i><sub>3</sub>ReO<sub>7</sub> (<i>Ln</i> = Y, Er–Lu) with fluorite-related structure

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Investigation of Photoelectrocatalytic and Magnetic Properties of Sr₂YbRu_1–xTa_xO₆ (x = 0, 0.25, 0.5, 0.75, and 1)

Investigation of Photoelectrocatalytic and Magnetic Properties of Sr₂YbRu_1–xTa_xO₆ (x = 0, 0.25, 0.5, 0.75, and 1)