Investigation of the La2O3–Nb2O5–WO3 ternary phase diagram: Isolation and crystal structure determination of the original La3NbWO10 material

Vu, Tuong Dan; Barré, Maud; Adil, Karim; Jouanneaux, A.; Suard, Emmanuelle; Goutenoire, F.

doi:10.1016/j.jssc.2015.05.022

Cited by 3 publications

(2 citation statements)

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“…The title compounds La 8.64 W 6 O 30.45 Cl, Ce 8.64 W 5.74 O 30 Cl, and Ln 8.33 W 6 O 30 Cl (Ln = Pr, Nd) crystallize in the tetragonal space group P 4 2 / nmc and represent a new series of oxychloride-type compounds. The structure of these compounds contains a complex arrangement of lanthanide and tungsten atoms, closely related to La 3 NbWO 10 , which was found to be a superstructure of the fluorite structure . These materials differ by the addition of the chloride anion and by severe site disorder found at crystallographic positions of tungsten, oxygen, and the respective lanthanide element.…”

Section: Resultsmentioning

confidence: 97%

Flux Crystal Growth of Lanthanide Tungsten Oxychlorides, La_8.64W₆O_30.45Cl, Ce_8.64W_5.74O₃₀Cl, and Ln_8.33W₆O₃₀Cl (Ln = Pr, Nd): Structural Stability in the Presence of Extreme Cation and Anion Disorder

et al. 2019

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A series of lanthanide tungsten oxychlorides with compositions of La8.64W6O30.45Cl, Ce8.64W5.74O30Cl, Pr8.33W6O30Cl, and Nd8.33W6O30Cl was synthesized as single crystals via a high-temperature flux growth method. The reduction of Ce(IV) to Ce(III) was performed in the synthesis of Ce8.64W5.74O30Cl using Zn metal as the reducing agent. All four compounds crystallize in the tetragonal space group P42/nmc with a highly disordered and rather unusual arrangement of Ln(III) and W(VI) cations. The three-dimensional crystal structure consists of a complex network of Ln cations occupying multiple coordination environments, including LnO8 cubes. The level of complexity the disorder adds to the overall structure was considered using calculations for the total information content of the crystal. The temperature dependence of the magnetic susceptibility of Pr8.33W6O30Cl and Nd8.33W6O30Cl was measured, and both compounds exhibit paramagnetic behavior across the entire 2–300 K temperature range measured.

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Section: Resultsmentioning

confidence: 97%

Flux Crystal Growth of Lanthanide Tungsten Oxychlorides, La_8.64W₆O_30.45Cl, Ce_8.64W_5.74O₃₀Cl, and Ln_8.33W₆O₃₀Cl (Ln = Pr, Nd): Structural Stability in the Presence of Extreme Cation and Anion Disorder

et al. 2019

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“…In addition, new materials with promising characteristics can be found based on the results of studies on the preparation of complex oxide solid solutions. For example, Vu et al [7] investigated the phase diagram La 2 O 3 -WO 3 -Nb 2 O 5 and to date discovered and studied a new composition La 3 NbWO 10 , which is characterized by a relatively high oxygen conductivity due to the transport of oxygen ions.…”

Section: Introductionmentioning

confidence: 99%

Phase formation processes and synthesis of solid solutions in Ca-R-Nb-M-O systems

et al. 2020

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During the study of the phase formation process in Ca-R-Nb-M-O systems (R=La, Bi, M=Mo, W), an attempt was made to obtain single-phase compounds of CaRNbMO8 composition by the standard ceramic technique. In addition, samples based on LaNbO4, CaWO4, BiNbO4 were also synthesized by the standard ceramic technique. The phase composition of the samples was studied by XRD analysis. The electrical conductivity of the obtained solid solutions and potential composite materials was investigated by impedance spectroscopy.

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ChemInform Abstract: Investigation of the La₂O₃—Nb₂O₅—WO₃ Ternary Phase Diagram: Isolation and Crystal Structure Determination of the Original La₃NbWO₁₀ Material.

Vu¹,

Barré²,

Adil³

et al. 2015

ChemInform

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Material. -Based on investigations of the La 2O3-WO3-Nb2O5 ternary phase diagram, La3NbWO10 is newly discovered in samples prepared from stoichiometric amounts of La2O3, Nb2O5, and WO 3 (alumina crucible, complex heating schedule with max. 1400 C, 65 h). It crystallizes in the tetragonal space group P4 2/nmc (Z = 6, powder and neutron XRD) and is built up from infinite ribbons of (W/Nb)O 5 octahedra which are perpendicular to each other and La distributed around these ribbons. Impedance spectroscopic measurements reveal a much lower oxygen ionic conductivity than those of the reference materials YSZ 8% and La2Mo2O9 which is explained in terms of vacancies not being located in tunnels but in zig-zag paths. High temperature powder XRD data reveal a thermal expansion coefficient of 9.72 x 10 -6 K -1 . -(VU*, T. D.; BARRE, M.; ADIL, K.; JOUANNEAUX, A.; SUARD, E.; GOUTENOIRE, F.; J. Solid State Chem. 229 (2015) 129-134, http://dx.doi.org/10.1016/j.jssc.2015.05.022 ; Inst. Mol. Materiaux Mans, CNRS, Univ. Maine, F-72085 Le Mans, Fr.; Eng.) -J. Schramke 40-018

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Investigation of the La2O3–Nb2O5–WO3 ternary phase diagram: Isolation and crystal structure determination of the original La3NbWO10 material

Cited by 3 publications

References 31 publications

Flux Crystal Growth of Lanthanide Tungsten Oxychlorides, La_8.64W₆O_30.45Cl, Ce_8.64W_5.74O₃₀Cl, and Ln_8.33W₆O₃₀Cl (Ln = Pr, Nd): Structural Stability in the Presence of Extreme Cation and Anion Disorder

Flux Crystal Growth of Lanthanide Tungsten Oxychlorides, La_8.64W₆O_30.45Cl, Ce_8.64W_5.74O₃₀Cl, and Ln_8.33W₆O₃₀Cl (Ln = Pr, Nd): Structural Stability in the Presence of Extreme Cation and Anion Disorder

Phase formation processes and synthesis of solid solutions in Ca-R-Nb-M-O systems

ChemInform Abstract: Investigation of the La₂O₃—Nb₂O₅—WO₃ Ternary Phase Diagram: Isolation and Crystal Structure Determination of the Original La₃NbWO₁₀ Material.

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Investigation of the La2O3–Nb2O5–WO3 ternary phase diagram: Isolation and crystal structure determination of the original La3NbWO10 material

Cited by 3 publications

References 31 publications

Flux Crystal Growth of Lanthanide Tungsten Oxychlorides, La8.64W6O30.45Cl, Ce8.64W5.74O30Cl, and Ln8.33W6O30Cl (Ln = Pr, Nd): Structural Stability in the Presence of Extreme Cation and Anion Disorder

Flux Crystal Growth of Lanthanide Tungsten Oxychlorides, La8.64W6O30.45Cl, Ce8.64W5.74O30Cl, and Ln8.33W6O30Cl (Ln = Pr, Nd): Structural Stability in the Presence of Extreme Cation and Anion Disorder

Phase formation processes and synthesis of solid solutions in Ca-R-Nb-M-O systems

ChemInform Abstract: Investigation of the La2O3—Nb2O5—WO3 Ternary Phase Diagram: Isolation and Crystal Structure Determination of the Original La3NbWO10 Material.

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Flux Crystal Growth of Lanthanide Tungsten Oxychlorides, La_8.64W₆O_30.45Cl, Ce_8.64W_5.74O₃₀Cl, and Ln_8.33W₆O₃₀Cl (Ln = Pr, Nd): Structural Stability in the Presence of Extreme Cation and Anion Disorder

Flux Crystal Growth of Lanthanide Tungsten Oxychlorides, La_8.64W₆O_30.45Cl, Ce_8.64W_5.74O₃₀Cl, and Ln_8.33W₆O₃₀Cl (Ln = Pr, Nd): Structural Stability in the Presence of Extreme Cation and Anion Disorder

ChemInform Abstract: Investigation of the La₂O₃—Nb₂O₅—WO₃ Ternary Phase Diagram: Isolation and Crystal Structure Determination of the Original La₃NbWO₁₀ Material.