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  • Chemistry  (107)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 411 (1975), S. 61-78 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Perovskites of the Composition A2BUIVO6 with A, B = Ba, Sr, Ca, Mg, and PbThe influence of the A und B ions on the charge transfer O → U are studied by diffuse reflectance measurements. They are completed by vibrational spectroscopic spectroscopic and structural investigations.
    Notes: Die Einflüsse der A- und B-Ionen auf den charge transfer O → U werden an Hand der diffusen Reflexionsspektren studiert. Zur Ergänzung dienen schwingungsspektroskopische und Sturkturuntersuchungen.
    Additional Material: 9 Ill.
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Perovskite Phases in the Systems AO—Se2O3—UO2,x with A = Alkaline Earth Metal and SE = Rare Earths, La, and Y. IX. The Systems Ba2SrUo6—Ba2Gd0.67UO6 and Ba2SrUO6—Ba2Y0.67UO6The ordered perovskite Ba2SrUO6 forms a solid solution series with Ba2Gd0.67UO6 and Ba2Y0,67UO6 respectively. The deviations from the ideal behaviour are studied by x-ray, diffuse reflectance and vibrational methods.
    Notes: Die geordneten Perowskite Ba2SrUO6 und Ba2Gd0,67UO6 bzw. Ba2Y0,67UO6 bilden eine lückenlose Reihe von Mischkristallen. Die Abweichungen vom idealen Verhalten werden röntgenographisch sowie an Hand der diffusen Reflexionsspektren und Schwingungsspektren untersucht.
    Additional Material: 9 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 429 (1977), S. 181-184 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Determination of Structures of Ordered Perovskites of the Ba2B0,67IIIMVIO6 TypeIntensity calculations on powder patterns of Ba2Y0.67III□0.33MVIO6 with MVI = U, W, Te und Ba2Gd0.67□0.33UO6 lead for the space group Fm3m/Oh5 with 8 Ba in 8c, 8/3 BIII and 4/3 □ in 4b, 4 MVI in 4a and 24 O in 24e to R values between 4.3 and 7.6%. Two further models are discussed.
    Notes: Intensitätsberechnungen an Pulverdaten von Ba2Y0,67III□0,33MVIO6 mit MVI = U, W, Te und Ba2Gd0,67□0.336 ergaben für die Raumgruppe Fn3m/Oh5 mit 8 Ba in 8c,8/3 BIII und 4/3 □ in 4b, 4Mv1 in 4a und 24 O in 24e R-Werte zwischen 4,3 und 7,6%. Es werden zwei weitere Modelle diskutiert.
    Additional Material: 2 Tab.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 431 (1977), S. 134-143 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polymorphism of Perovskite Compounds Ba2SE0.67WVIO6. II. The Systems Ba2Nd0.67(1-x)Y0.67xWO6 and Ba2Nd0.67W1-xUxO6In the system Ba2Nd0.67(1-x)Y0.67xWO6 the formation of a continuous series of mixed crystals with cubic 1:1 ordered perovskite structure is observed. The existence of a hexagonal modification is confined to the Y-rich side (x ≥ 0,9). In the Ba2Nd0.67W1-xUxO6 series only for x ≤ 0,25 homogeneous cubic perovskites are obtained. In contrast to systems with other rare earths the Nd series show uncommon optical properties.
    Notes: Im System Ba2Nd0,67(1-x)Y0,67xWO6 wird die lückenlose Bildung von Mischkristallen mit kubischer 1:1 geordneter Perowskitstruktur beobachtet. Die Existenz einer hexagonalen Modifikation ist auf die Y-reiche Seite (x ≥ 0,9) beschränkt. In der Reihe Ba2Nd0,67W1-xUxO6 können einheitliche kubische Perowskite allein für x ≤ 0,25 erhalten werden. Im Gegensatz zu Systemen mit anderen Seltenen Erden zeichnen sich die Nd-Reihen durch ungewöhnliche optische Eigenschaften aus.
    Additional Material: 2 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 424 (1976), S. 211-228 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Perovskite Phases of the System Ba2Y0,67U1-xWxO6A solid solution series is formed between the polymorphic perovskites Ba2Y0.67UO6 and Ba2Y0.67WO6 (cubic: a = 8.372 Å; hexagonal: a = 4× 5.881 Å and c = 4× 7.778 Å). The structure is cubic between x = 0.1 and 0.99 and for x 〉 0.95 hexagonal as well. Strong deviations from the ideal behaviour are detectabel with spectroscopic methods. The shape of the UO6 and WO6 octahedrons experiences only minor changes within the series.
    Notes: Die polymorphen Perowskite Ba2Y0,67UO6 und Ba2Y0,67 WO6 (kubisch: a = 8,372 Å; hexagonal: a = 4× 5,881 Å und c = 4× 7,778 Å) bilden Mischkristalle. Diese kristallisieren zwischen x = 0,1 und 0,99 kubisch und für x 〉 0,95 ebenfalls hexagonal. Mit spektroskopischen Methoden sind starke Abweichungen vom idealen Verhalten feststellbar. Die Gestalt der UO6- und WO6-Oktaeder erfährt innerhalb der Mischkristallreihe nur geringfügige Änderungen.
    Additional Material: 13 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 425 (1976), S. 175-179 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polymorphism of Tungsten Perovskite Compounds Ba2SE0,67WO6The compounds Ba2SE0,67WO6 with SE = Gd—Lu are polymorphic. Above 1200°C the instable cubic modification (ordered perovskit with 4 formula units Ba2SE0,67□0,33WO6 per cell) transforms irreversibly into a hexagonal modification with completely filled cationic lattice. For Ba2Eu0,67WO6 the transformation is incomplete. With SE = Nd and Sm only the cubic modification is formed.
    Notes: Die Verbindungen Ba2SE0,67WO6 mit SE = Gd—Lu sind polymorph. Die instabile kubische Modifikation (geordneter Perowskit mit 4 Formeleinheiten Ba2SE0,67□0,33WO6 pro Zelle) wandelt sich oberhalb 1200°C irreversibel in eine hexagonale Modifikation mit aufgefülltem Kationengitter um. Bei Ba2Eu0,67WO6 ist die Umwandlung unvollständig. Mit SE = Nd und Sm konnte allein die kubische Modifikation erhalten werden.
    Additional Material: 1 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 437 (1977), S. 197-202 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vibrational Spectroscopic Investigation on Perovskite Type Variants Ba2B0.67III□0.33MVIO6 and their Solid Solutions with Ba2BIIMVIO6In the perovskite typ variants Ba2B0.67III□0.33MVIO6 with MVI = W, U, Te several kinds of MVIO6 octahedra are to distinguish. The study of the solid solutions Ba2B1-xIIY0.67x□0.33xWO6 (BII = Mg, Ca) shows, that in the lattice no more than three different types of WO6 octahedra can be present.
    Notes: Die Perowskitvarianten Ba2B0,67III□0,33MVIO6 mit MVI = W, U, Te enthalten mehrere Sorten an MVIO6-Oktaedern. Aus der Untersuchung der Mischkristallsysteme Ba2B1-xIIY0,67x□0,33xWO6 (BII = Mg, Ca) geht hervor, daß im Gitter nicht mehr als drei verschiedene Typen von WO6-Oktaedern vorhanden sein können.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 437 (1977), S. 203-209 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vibrational Spectroscopic Investigations of the Systems Ba2CaU1-xWxO6 and Ba2SrU1-xWxO6In the systems Ba2CaU1-xWxO6 and Ba2SrU1-xWxO6 the internal vibration modes of UO6 and WO6 octahedras can be separated. With increasing x systematic variations are observed and the valence force constants fUO and fWO tends to adjust for each x. The bond order N and the M—O distances are reported as well.
    Notes: In den Systemen Ba2CaU1-xWxO6 und Ba2SrU1-xWxO6 sind die Schwingungen innerhalb der UO6- und WO6-Oktaeder getrennt zu beobachten. Mit x treten systematische Veränderungen ein, wobei sich für jedes x die Valenzkraftkonstanten fMO beider Oktaedersorten anzugleichen suchen. Die Bindungsgrade N und M—O-Abstände werden ebenfalls mitgeteilt.
    Additional Material: 2 Ill.
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  • 9
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vibrational Investigations on Ordered Perovskites A2IIBMO6. I. MO6 Octahedra: Symmetry, Force Constants, and DistancesAccording to their vibrational spectra the ordered perovskites A2IIBMO6 can be divided in three groups: compound with 1. MO6 octahedra of symmetry Oh, 2. MO6 octahedra of lowered point symmetry, 3. different kinds of MO6 octahedra. The force constants, M—O distance and bond order are calculated.
    Notes: Die geordneten Perowskite A2IIBMO6 Können auf Grund ihrer Schwingungs-spektren in 3 Gruppen eingeteilt werden: Verbindungen mit 1. MO6-Oktaedern der Symmetrie Oh, 2. MO6-Oktaeder mit erniedrigter Punktsymmetrie, 3. mit verschiedenen Sorten an MO6-Oktaedern. Die Kraftkonstanten, M—O-Abstände und Bindungsgrade werden berechnet.
    Additional Material: 2 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 446 (1978), S. 53-63 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Perovskites Ba2BI1/2BIII1/2UVIO6Compounds of type Ba2Li1/2BIII1/2UVIO6 and Ba2Na1/2BIII1/2UVIO6 are formed with BIII = La, Nd, Sm, Gd, Y, In as red to reddish brown perovskites. They are for BIII = La, Nd and Sm polymorphic. With BIII = La both HT-forms crystallize cubic. In the Li series the HT-modifications with BIII = Nd, Sm are monoclinic (a 〈 c/√2 〈 b) and in the Na series rhombic (c/√2 〈 a 〈 b); the corresponding Gd, Y, and in compounds have the same structure. The transformation HT → TT is reversible. The TT modifications crystallize monoclinic (a 〈 b 〈 c/√2). Unlike the HT forms an increase of c and a decrease of a and b is observed, the cell volumina rested nearly unchanged. The origin for the transformation are order disorder phenomena.
    Notes: Verbindungen vom Typ Ba2Li1/2BIII1/2UVIO6 und Ba2Na1/2BIII1/2UVIO6 bilden sich mit BIII = La, Nd, Sm, Gd, Y, In als rote bis rötlich braune Perowskite. Sie sind für BIII = La, Nd, Sm polymorph. Die beiden HT-Formen mit BIII = La Kristallisieren kubisch. In der Li-Reihe sind die HT-Modifikationen mit BIII = Nd, Sm monoklin (a 〈 c/√2 〈 b) und in der Na-Reihe rhombisch (c/√2 〈 a 〈 b), die entsprechenden Gd-, Y- und In-Verbindungen besitzen die gleiche Struktur. Die Umwandlung HT → TT ist reversibel. Die TT-Modifikationen Kristallisieren monoklin (a 〈 b 〉 c/√2) sie unterscheiden sich von den HT-Formen durch die Zunahme von c und eine Abnahme von a und b bei praktisch gleichen Zellvolumen. Die Polymorphie ist auf Ordnungs-Un-ordnungs-Phänomene zurückzuführen.
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