Geometric magnetic frustration in RE2O2S oxysulfides (RE=Sm, Eu and Gd)

Biondo, Valdecir; Sarvezuk, P.W.C.; Ivashita, Flávio F.; Silva, K.L.; Paesano, Andrea; Isnard, O.

doi:10.1016/j.materresbull.2014.03.008

Cited by 15 publications

(7 citation statements)

References 23 publications

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“…At the same time, the consideration of lanthanide-containing materials cannot be restricted only by their luminescent properties. The possibility of using lanthanide compounds with simple and complex anions as paramagnetic, catalytic, scintillation and solid oxide-fuel materials are being increasingly investigated [41][42][43][44][45][46]. The present study is aimed at the samarium oxysulfatesynthesis in the high-temperature oxidative process and exploration of their structural, thermal and spectroscopic properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Samarium OxysulfateSm2O2SO4 in the High-Temperature Oxidation Reaction and Its Structural, Thermal and Luminescent Properties

et al. 2020

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The oxidation process of samariumoxysulfide was studied in the temperature range of 500–1000 °C. Our DTA investigation allowed for establishing the main thermodynamic (∆Hºexp = −654.6 kJ/mol) and kinetic characteristics of the process (Ea = 244 kJ/mol, A = 2 × 1010). The enthalpy value of samarium oxysulfate (ΔHºf (Sm2O2SO4(monocl)) = −2294.0 kJ/mol) formation was calculated. The calculated process enthalpy value coincides with the value determined in the experiment. It was established that samarium oxysulfate crystallizes in the monoclinic symmetry class and its crystal structure belongs to space group C2/c with unit cell parameters a = 13.7442 (2), b = 4.20178 (4) and c = 8.16711 (8)Å, β = 107.224 (1)°, V = 450.498 (9)Å3, Z = 4. The main elements of the crystalline structure are obtained and the cation coordination environment is analyzed in detail. Vibrational spectroscopy methods confirmed the structural model adequacy. The Sm2O2SO4luminescence spectra exhibit three main bands easily assignable to the transitions from 4G5/2 state to 6H5/2, 6H7/2, and 6H9/2 multiplets.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Samarium OxysulfateSm2O2SO4 in the High-Temperature Oxidation Reaction and Its Structural, Thermal and Luminescent Properties

et al. 2020

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“…Some of them also involve a transition metal, producing bimetallic compounds, such as Ln 2 Ti 2 S 2 O 5 and LnCrOS 2 (Ln = La-Lu) [3][4][5] , but also LaInOS 2 and La 5 In 3 S 9 O 3 . 6 Ln 2 O 2 S nanoparticles have been extensively studied and characterized for their promising magnetic [7][8][9] , photocatalytic 8 and luminescent properties 10,11 . In the latter case, most studied compounds are La 2 O 2 S, [12][13][14][15] Gd 2 O 2 S [16][17][18][19][20][21] and Y 2 O 2 S, [22][23][24][25][26][27][28][29][30] , especially with rare-earth doping (Eu III , Tb III , Yb III The synthesis of oxysulfide nanoparticles is challenging, as rare-earth metals have a better affinity with O 2than S 2according to the Hard and Soft Acid and Bases (HSAB) theory.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ce₂O₂S and Gd_2(1–y)Ce_2yO₂S Nanoparticles and Reactivity from in Situ X-ray Absorption Spectroscopy and X-ray Photoelectron Spectroscopy

et al. 2017

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Lanthanide oxysulfide nanoparticles have recently attracted interest in view of their potential applications, such as lighting devices and MRI contrast agents, which requires a good stability in air and a controlled surface. In order to address these issues, in this work, air-sensitive CeOS nanoparticles of hexagonal shape were successfully prepared and characterized under inert conditions. Bimetallic GdCeOS nanoparticles of similar shape and size were also synthesized for the whole composition range (y from 0 to 1). X-ray diffraction structural data are found to follow Vegard's law up to y = 0.4, which is attributed to the loss of stability in air of Ce-rich nanocrystals beyond this threshold. This picture is supported by X-ray absorption spectra taken at the S K-edge and Ce L-edge that show the partial oxidation of sulfide species and of Ce to Ce in the presence of air or water. A complementary near-ambient-pressure X-ray photoelectron spectroscopy study shows that at least two types of oxidized sulfur species form on the nanoparticle surface. Even in GdOS nanoparticles that are generally considered to be air-stable, we found that sulfide ions are partially oxidized to sulfate in air. These results unveil the physicochemical mechanisms responsible for the surface reactivity of lanthanide oxysulfides nanoparticles in air.

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“…Ballestracci et al studied the Ln 2 O 2 S bulk compounds by neutron diffraction and estimated the Néel temperature ( T N ) of Gd 2 O 2 S to be 5.7 K. In the paramagnetic phase, its Curie–Weiss temperature ( T CW ) is –18 K. The magnetic moment of Gd atoms (7.92 µ B ) was very close to these of the isolated paramagnetic ion (7.94 µ B ). In 2014, Biondo et al revisited the properties of Ln 2 O 2 S oxysulfides (Ln = Sm, Eu, Gd) . In the case of Gd 2 O 2 S, the reported properties are close to those of Ballestracci et al, i.e.…”

Section: Resultsmentioning

confidence: 80%

Tunable Magnetic Properties of (Gd,Ce)₂O₂S Oxysulfide Nanoparticles

et al. 2019

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Nanoparticles with strong paramagnetic responses are of prime interest for advanced MRI imaging. To replace expensive and toxic Gd complexes, Gd-based nanoparticles have emerged as a viable solution for efficient and harmless MRI contrast agents. Gadolinium oxysulfide nanoparticles could represent suitable candidates for MRI imaging and bimodal imaging thanks to their excellent properties as host matrix and chemical stability, but their magnetic properties at the nanoscale have been hitherto poorly investigated especially in the case of ultrafine nanoparticles (< 10 nm), where surface effects and ligands can significantly affect the magnetic behavior. In the present work, we synthesized and characterized bimetallic [a]

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Geometric magnetic frustration in RE2O2S oxysulfides (RE=Sm, Eu and Gd)

Cited by 15 publications

References 23 publications

Synthesis of Samarium OxysulfateSm2O2SO4 in the High-Temperature Oxidation Reaction and Its Structural, Thermal and Luminescent Properties

Synthesis of Samarium OxysulfateSm2O2SO4 in the High-Temperature Oxidation Reaction and Its Structural, Thermal and Luminescent Properties

Synthesis of Ce₂O₂S and Gd_2(1–y)Ce_2yO₂S Nanoparticles and Reactivity from in Situ X-ray Absorption Spectroscopy and X-ray Photoelectron Spectroscopy

Tunable Magnetic Properties of (Gd,Ce)₂O₂S Oxysulfide Nanoparticles

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Geometric magnetic frustration in RE2O2S oxysulfides (RE=Sm, Eu and Gd)

Cited by 15 publications

References 23 publications

Synthesis of Samarium OxysulfateSm2O2SO4 in the High-Temperature Oxidation Reaction and Its Structural, Thermal and Luminescent Properties

Synthesis of Samarium OxysulfateSm2O2SO4 in the High-Temperature Oxidation Reaction and Its Structural, Thermal and Luminescent Properties

Synthesis of Ce2O2S and Gd2(1–y)Ce2yO2S Nanoparticles and Reactivity from in Situ X-ray Absorption Spectroscopy and X-ray Photoelectron Spectroscopy

Tunable Magnetic Properties of (Gd,Ce)2O2S Oxysulfide Nanoparticles

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Synthesis of Ce₂O₂S and Gd_2(1–y)Ce_2yO₂S Nanoparticles and Reactivity from in Situ X-ray Absorption Spectroscopy and X-ray Photoelectron Spectroscopy

Tunable Magnetic Properties of (Gd,Ce)₂O₂S Oxysulfide Nanoparticles