Notizen: Die Struktur einiger Fluoride, Oxide und Oxidfluoride AMe2X6: Der RbNiCrF6-Typ

Babel, D.; Pausewang, G.; Viebahn, W.

doi:10.1515/znb-1967-1126

Cited by 166 publications

(52 citation statements)

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“…The published structural data only give the cationic positions. Our single crystal investigations of (I) and (II) confirmed the main cationic positions of Cs and Ta ions obtained by Babel et al [16] and indicated clearly that both types (Table 2). Both structures were refined with high accuracy (R-factors equal to 0.0223 and 0.0172 for type I and II crystals, respectively).…”

Section: Structural Investigation Of Csta 2+z N+ O 5+y F 1−y (N ≤ 5) supporting

confidence: 87%

“…These crystals have been deposited at the cathode during most of electrolysis cycles. The lamellar crystals of the first type (I) are transparent, colorless and dielectric similar to the ones described in [16]. The crystals of another type (II) are black and metal-like, pointing to an oxidation state of the Ta ion lower than 5.…”

Section: Phase Composition Of Electrolysis Productssupporting

confidence: 57%

“…Only CsTa 2 n+ O 5 F has been described before with the highest oxidation state of Ta [16]. The published structural data only give the cationic positions.…”

Section: Structural Investigation Of Csta 2+z N+ O 5+y F 1−y (N ≤ 5) mentioning

confidence: 99%

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Electrode and chemical reactions during electrodeposition of tantalum products in CsCl melt

Grinevitch

Kuznetsov

Arakcheeva

et al. 2006

Electrochimica Acta

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This work was accomplished in the context of systematic examination of a role played by electrolyte cation composition in electroreduction processes. The electrochemical behaviour of molten salts systems where CsCl was used as solvent for potassium and caesium oxyfluorotantalates was investigated. In particular, the influence of the electrolysis parameters, such as concentration of tantalum species in electrolyte, temperature and current density on the cathodic products phase composition was determined by X-ray diffraction and scanning electron microscopy. Several phases generally crystallized at the cathode simultaneously. Among identified phases were metallic tantalum in cubic (␣) and tetragonal (␤) crystal modifications and TaO. But the most characteristic phases for the melt under study were two isostructural compounds with pyrochlor type crystal lattice CsTa 2+z 5 O 5+y F 1−y and CsTa 2+z 5−x O 5+y F 1−y . The former deposited in the form of transparent dielectric crystals and the later -in the form of metal-like conductive ones. This latter compound seems to be synthesized for the first time. The peculiarities of its structure were described. Electrochemical redox processes in melts containing potassium oxyfluorotantalates dissolved in CsCl were studied by cyclic voltammetry. Three discharge peaks were detected on voltammograms in the temperature range 700-850 • C. They were associated with the discharge of TaOF 6 3− and TaO 2 F 4 3− complexes and alkali metal cations.

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Section: Structural Investigation Of Csta 2+z N+ O 5+y F 1−y (N ≤ 5) supporting

confidence: 87%

Section: Phase Composition Of Electrolysis Productssupporting

confidence: 57%

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Electrode and chemical reactions during electrodeposition of tantalum products in CsCl melt

Grinevitch

Kuznetsov

Arakcheeva

et al. 2006

Electrochimica Acta

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“…La structure pyrochlore cubique de type AIB.,X6 (X = O, F) de groupe d'espace Fd3m (Z = 8), a 6t~ d6crite par Babel, Pausewang & Viebahn (1967); elle est constitute d'un r~seau tridimensionnel (BzX6)-d'octa~dres partageant tous leurs sommets, constituant de vastes cages centr~es sur les positions 8(b). Ces cages communiquent entre elles suivant les directions [111] et accueiUent les gros ions monovalents A I. Plusieurs structures de pyrochlores AXB2X6 d~ter-min~es sur monocristal confirment ce module (Babel, 1972;Jacoboni, 1975;Goodenough, Hong & Kafalas, 1976).…”

Section: Introductionunclassified

Localisation des ions mobiles Tl⁺ dans le conducteur ionique TlNb₂O₅F de type pyrochlore

Fourquet¹,

Jacoboni²,

Pape³

1979

Acta Crystallogr Sect B

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The non-stoichiometric phase TlxNbOz+xFl_ x (0.5 < x < 1) has a cubic pyrochlore structure (Fd3m) and its TI + ionic conductivity increases notably with x. For x = 0.5 [a = 10.506 (3) A, Z = 8] standard treatment allowed the location of the heavy ions, T1 +, and a structure refinement was carried out which led to a final R value of 0.069 (R w = 0-054) for 121 independent reflexions collected on an automated three-circle diffractometer. The thallous ions are found on two sets of 32(e) positions, displaced respectively by 0.69 and 0.64 A away from the empty ideal 8(b) positions. Observed F o values cannot be explained on the basis of an anharmonical treatment of TI + movement. The properties of the motion of the ions are related both to the high polarizability of T1 + ions and to the large number of sites offered to the cations by the NbO2+ xFi-_x network. conduisent b, des valeurs tr+s +lev+es du facteur d'agitation thermique isotrope du thallium comme le montre le Tableau 1.

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“…Depuis les travaux sur les pyrochlores fluor6s du type RbNiCrF6 (Babel, Pausewang & Viebahn, 1967;Babel, 1972), l'6tude des compos6s isotypes a 6t6 largement d6velopp6e par diff6rents auteurs (Jacoboni, 1970(Jacoboni, , 1975Banks, Berkooz & de Luca, 1971). Pour notre part, nous avons 6tudi6 une possibilit6 de substitution des ions de transition qui se r6partissent dans les sites 16(¢) du groupe spatial Fd3m (Courbion, Jacoboni & de Pape, 1971).…”

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La structure cristalline de Cs₂NaAl₃F₁₂

Courbion¹,

Jacoboni²,

Pape³

1976

Acta Crystallogr B Struct Sci

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Cs2NaA13F12 is rhombohedral, space group R3m, with a= 7.310 (5) A, ~= 57.45 (0-10) °, Z= 1. Singlecrystal diffraction data collected on an automatic four-circle diffractometer have been refined by fullmatrix least-squares calculations to a weighted R' value of 0.036 (unweighted R = 0.028) for 305 observed reflexions. The structure consists of trigonal (A1F£), layers linked by NaF6 octahedra; it can also be considered as a pyrochlore-type structure with a ½ order between 16(c) cationic sites.

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Notizen: Die Struktur einiger Fluoride, Oxide und Oxidfluoride AMe₂X₆: Der RbNiCrF₆-Typ

Cited by 166 publications

References 0 publications

Electrode and chemical reactions during electrodeposition of tantalum products in CsCl melt

Electrode and chemical reactions during electrodeposition of tantalum products in CsCl melt

Localisation des ions mobiles Tl⁺ dans le conducteur ionique TlNb₂O₅F de type pyrochlore

La structure cristalline de Cs₂NaAl₃F₁₂

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Notizen: Die Struktur einiger Fluoride, Oxide und Oxidfluoride AMe2X6: Der RbNiCrF6-Typ

Cited by 166 publications

References 0 publications

Electrode and chemical reactions during electrodeposition of tantalum products in CsCl melt

Electrode and chemical reactions during electrodeposition of tantalum products in CsCl melt

Localisation des ions mobiles Tl+ dans le conducteur ionique TlNb2O5F de type pyrochlore

La structure cristalline de Cs2NaAl3F12

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Notizen: Die Struktur einiger Fluoride, Oxide und Oxidfluoride AMe₂X₆: Der RbNiCrF₆-Typ

Localisation des ions mobiles Tl⁺ dans le conducteur ionique TlNb₂O₅F de type pyrochlore

La structure cristalline de Cs₂NaAl₃F₁₂