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  • 1
    ISSN: 0584-8539
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    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.
    Type of Medium: Electronic Resource
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  • 3
    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. VIII. The Systems Ba2CaUO6—Ba2Gd0.67UO6 and Ba2CaUO6—Ba2Y0.67UO6The ordered perovskite Ba2CaUO6 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: Der geordnete Perowskit Ba2CaUO6 bildet mit Ba2Gd0,67UO6 bzw. Ba2Y0,67UO6 eine lückenlose Mischkristallreihe. Die Abweichungen vom idealen Verhalten werden röntgenographisch und an Hand der diffusen Reflexions- und Schwingungsspektren untersucht.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 4
    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.
    Additional Material: 1 Tab.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 410 (1974), S. 39-47 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the System Ba2Sm0.67(1-x)La0.67xUO6In the Ba2Sm0.67xUO6 system the boundary of the perovskite phase reachs up to x ≅ 0.33. With increasing Lanthanum content a transition from a structure with vacancies in the SE3+-sublattice to a lattice typ with interstitial oxygen is observed. By the interpretation of the reflectance and vibrational spectra the relations between colour and constitution are shown.
    Notes: Im System Ba2Sm0,67(1-x)La0,67xUO6 reicht die Grenze der Perowskitphase bis zu x ≅ 0,33. Mit steigendem La-gehalt findet ein Übergang von einer Struktur mit Lücken im SE3+-Teilgitter zu einem Gittertyp mit Sauerstoff auf Zwischengitterplätzen statt. Die Zusammenhänge zwischen Farbe und Konstitution werden anhand der diffusen Reflexionsspektren und der Schwingungsspektren aufgezeigt.
    Additional Material: 2 Ill.
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  • 6
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Ordered Perovskites with Cationic Defects. The Systems Ba2MgWO6—Ba2Y0.67WO6 and Ba2CaWO6—Ba2Y0.67WO6The perovskites Ba2MgWO6 and Ba2CaWO6 show complete miscibility with Ba2Y0.67WO6. The mixed crystals have a cubic 1:1 ordered perovskite structure, whereas with x an increase of cationic defects is observed (systems Ba2B1-xIIY0.67x□0.33xWO6). Depending on the occupation of the neighbouring positions different types of WO6 octahedra are present. The transformation cubic → hexagonal, which is characteristic for Ba2Y0.67WO6, is oppressed by the incorporation of BII ions.
    Notes: Die Perowskite Ba2MgWO6 bzw. Ba2CaWO6 zeigen mit Ba2Y0,67WO6 vollständige Mischbarkeit. Die in einem kubischen 1:1 geordneten Perowskitigitter kristallisierenden Mischkristalle enthalten mit x steigende Mengen an Kationenfehlstellen (Systeme Ba2B1-xIIY0,67x □0,33xWO6). In Abhängigkeit von den Nachbarschaftsverhältnissen liegen verschiedene Typen an WO6-Oktaedern nebeneinander vor. Die für Ba2Y0,67WO6 charakteristische Umwandlung kubisch → hexagonal wird durch Einbau von BII-Ionen unterdrückt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 407 (1974), S. 181-192 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the System Ba2Sm 0.67U1-xWxO6The ordered perovskites Ba2Sm0.67UO6 and Ba2Sm0.67 WO6 are forming a complete serie of solid solutions with 4 formula units Ba2Sm0.67U1-xWxO6 in the unit cell. By diffuse reflectance and i.r.-spectroscopic measurements the relations between color and constitution are shown.
    Notes: Die geordneten Perowskite Ba2Sm0,67UO6 und Ba2Sm0,67WO6 bilden eine lückenlose Reihe von Mischkristallen mit vier Formeleinheiten Ba2Sm0.67U1-xWxO6 pro Elementarzelle. Die Zusammenhänge zwischen Farbe und Konstitution werden an Hand der diffusen Reflexionsspektren und der IR-Spektren aufgezeigt.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 8
    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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  • 9
    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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  • 10
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Ordered Perovskites with Cationic Vacancies. IV. Compounds of Type Ba6B2III□Te3VIO18Compounds of the composition Ba6B2III□Te3VIO18 ≙ Ba2B2/3III□1/3TeVIO6, with BIII = Pr, Nd, Sm—Lu, Y crystallize with a cubic perovskite lattice. The cell parameters diminish as the size of BIII falls (BIII = Pr: a = 8.528 Å Lu: a = 8.334 Å). In contrast to the corresponding Perovskites with UVI and WVI no polymorphism is observed.
    Notes: Verbindungen der Zusammensetzung Ba6B2III□Te3VIO18 ≙ Ba2B2/3III□1/3TeVIO6 kristallisieren für BIII = Pr, Nd, Sm—Lu, Y im kubischen Perowskitgitter. Die Gitterkonstanten nehmen mit sinkender BIII-Größe ab (BIII = Pr: a = 8,528 Å Lu: a = 8,334 Å). Im Gegensatz zu den entsprechenden Perowskiten mit UVI und WVI wird keine Polymorphie beobachtet.
    Additional Material: 1 Ill.
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