Thermodynamic investigation of the phase formation processes in the systems LnSe2–LnSe1.5 (Ln=La, Ce, Pr, Nd)

Зеленина, Л. Н.; Chusova, T. P.; Vasilyeva, I.G.

doi:10.1016/j.jct.2012.08.005

Cited by 26 publications

(2 citation statements)

References 16 publications

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“…Vapor Pressure Studies: Vapor pressure of AlNbBr 8 was measured by static method with glass (pyrex) membrane‐gauge manometers as described in the literature 25. The standard uncertainties in pressure and temperature values were 0.5 Torr and 0.5 K, respectively.…”

Section: Methodsmentioning

confidence: 99%

AlNbBr₈ – Preparation, Crystal Structure, and Vapor Pressure Studies

Rogachev

Зеленина

Chusova

et al. 2016

Zeitschrift anorg allge chemie

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Section: Methodsmentioning

confidence: 99%

AlNbBr₈ – Preparation, Crystal Structure, and Vapor Pressure Studies

Rogachev

Зеленина

Chusova

et al. 2016

Zeitschrift anorg allge chemie

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“…For example, the LnX 2– x electronic properties range from semimetals to semiconductors and exhibit charge density waves, , antiferromagnetism, and superconductivity . Unfortunately, the solid-state synthesis of these materials is challenging and requires increasingly high pressures across the series , due to the decomposition of LnX 2– x to form X 2 (g) and Ln 2 X 3 , although polychalcogenide fluxes may provide a general route …”

Section: Introductionmentioning

confidence: 99%

Single-Source Precursors for Lanthanide Diselenide Nanosheets

et al. 2019

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A series of complexes of the type [Ln(Se2P(phenyl)2)3(CH3CN) x ] (x = 1 or 2) have been synthesized and structurally characterized for Ln = La–Lu (excluding Pm). The complexes are straightforward to prepare and crystallize and are soluble in solvents typically used in nanoparticle synthesis. Solution-phase thermolysis of these complexes formed lanthanide diselenide or LnSe2–x nanosheets, for Ln = La–Ho, except Eu, which formed EuSe. By contrast, the smallest lanthanides Ln = Er–Lu formed Ln2Se3 nanomaterials. The lanthanide dichalcogenides are rare-earth analogues of the transition metal dichalcogenides and exhibit similar properties, including small band gaps, charge density waves, antiferromagnetism, and superconductivity. The lanthanide diselenide nanomaterials exhibited highly anisotropic growth and were phase pure with the exception of CeSe2 (which also formed a cerium oxide and cerium ultraphosphate). The lateral nanosheet dimensions, based on transmission electron microscopy (TEM), range from ∼50 to 500 nm, and the thickness was found to be ∼4 nm for the thinnest sheets by atomic force microscopy. The nanosheets were further characterized by powder X-ray diffraction, scanning electron microscopy, and Raman spectroscopy. Alloy formation was also demonstrated with the combined solution thermolysis of Sm and Gd complexes to form Sm1–x Gd x Se1.8. The alloy was found to have homogeneous composition on the basis of powder X-ray diffraction and TEM.

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