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  • Chemistry  (20)
  • PACS: 52.40.Nk; 52.50.Jm; 52.70.Kz  (1)
  • Polymer and Materials Science  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Shadowgraphic and interferometric investigations on Nd:YAG laser-induced vapor/plasma plumes for different processing wavelengths (1999)
    Springer
    Applied physics 69 (1999), S. S505 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 52.40.Nk; 52.50.Jm; 52.70.Kz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Shadowgraphic and interferometric images of vapor/plasma plumes generated by pulses of a ns-Nd:YAG laser reveal the distinctive behavior of the shock wave expansion for each of three processing wavelengths (1064 nm, 532 nm, and 355 nm), indicating that different mechanisms dominate the interaction between the optical fields and the material vapor/plasma. Electron density distributions within the plasma plumes calculated from interferometrically obtained refractive index distributions allow us to describe the regions of absorption and the absorption mechanisms using a simple model of inverse bremsstrahlung and photoionization, which allows us to estimate absorption coefficients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051454
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  • 2
    Electronic Resource
    Electronic Resource
    Eine neue Methode zur Darstellung von 1.2-Dicarbonylverbindungen (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 2475-2482 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A New Method for the Preparation of 1.2-Dicarbonyl CompoundsThe dehydrogenation of α-aminoketones with mercuric acetate or mercuric complexes gives 1.2-dicarbonyl compounds in mostly good yields.
    Notes: Die Dehydrierung von α-Aminoketonen mit Quecksilber(II)-acetat bzw. Quecksilber(II)-Komplexen führt in meist guten Ausbeuten zu 1.2-Dicarbonylverbindungen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19711040817
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  • 3
    Electronic Resource
    Electronic Resource
    Macrocycles, 1. Macrocyclic polymerizations of (thio)lactones - stepwise ring expansion and ring contraction (1998)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 199 (1998), S. 273-282 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 2,2-Dibutyl-2-stanna-1,3-dioxacycloalkanes were prepared from dibutyltin oxide and 1,2-ethanediol, 1,3-propanediol or 1,4-butanediol. These tin heterocycles reacted stoichiometrically with double molar amounts of γ-thiobutyrolactone by a stepwise insertion. In contrast to γ-thiobutyrolactone an excess of γ-thiocaprolactone resulted in additional insertion steps, i.e., polymerization of the thiolactone. Analogous insertion reactions were performed with a spirocyclic stannoxane derived from pentaerythritol. With ε-caprolactone macrocyclic polymerization took place without stoichiometric intermediates. When the 2,2-dibutylstanna-dioxepane was reacted with an equimolar amount of 1,3-dithian-2-one, the insertion step was immediately followed by a ring contraction reaction yielding 2-stanna-1,3-dithiane and trimethylene carbonate which polymerized immediately. The application of this reaction sequence to macrocyclic stanna poly(ε-caprolactone) yielded tin-free macrocycles along with 2,2-dibutyl-2-stanna-1,3-dithiane. This reaction sequence allows the synthesis of nontoxic, biodegradable macrocyclic polyesters.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Über das System Ba2Sm0,67(1-x)La0,67xUO6 (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 410 (1974), S. 39-47 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744100106
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  • 5
    Electronic Resource
    Electronic Resource
    Über die Polymorphie der Wolframperowskite Ba2SE0,67WO6 (1976)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 425 (1976), S. 175-179 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19764250212
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  • 6
    Electronic Resource
    Electronic Resource
    Über geordnete Perowskite mit Kationenfehlstellen. IV. Verbindungen des Typs Ba6B2III□Te3VIO18 (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 454 (1979), S. 43-48 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794540108
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  • 7
    Electronic Resource
    Electronic Resource
    Über geordnete Perowskite mit Kationenfehlstellen. XI. Das System Ba2Gd2/3□1/3U1-xWxO6 (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 495 (1982), S. 219-231 
    Details
    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. XI. System Ba2Gd2/3□1/3U1-xWxO6The cation deficient polymorphic perovskites Ba2Gd2/3□1/3UO6 and Ba2Gd2/3□1/3WO6 form a continuous series of mixed crystals, which crystallize over a wide range (x = 0.1 up to 0.99) in a cubic 1:1 ordered perovskite lattice. According to the investigations of the vibrational spectra, the diffuse reflectance spectra, and the photoluminescence  -  opposite to isostructural perovskites without vacancies  -  different species of UO6 and WO6 octahedra are present. Numerous differences in properties  -  e. g. an orange emission colour in comparison with a green one by absence of vacancies  -  are based upon that.
    Notes: Die beiden fehlstellenhaltigen, polymorphen Perowskite Ba2Gd2/3□1/3UO6 und Ba2Gd2/3□1/3WO6 bilden eine lückenlose Reihe von Mischkristallen, die in einem weiten Bereich (x = 0,1 bis 0,99) in einem kubischen 1:1 geordneten Perowskitgitter kristallisieren. Wie die Untersuchung der Schwingungsspektren, der diffusen Reflexionsspektren und der Photolumineszenz zeigen, liegen  -  im Gegensatz zu isostrukturellen fehlstellenfreien Perowskiten  -  mehrere Sorten an UO6- und WO6-Oktaedern vor. Hierauf sind zahlreiche Eigenschaftsunterschiede  -  z. B. eine orangefarbene Emission im Unterschied zu einer grünen bei Abwesenheit von Fehlstellen  -  zurückzuführen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824950123
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  • 8
    Electronic Resource
    Electronic Resource
    Über Perowskitphasen in den Systemen AO—SE2O3—UO2,x mit A = Erdalkali und SE = Seltene Erden, La sowie Y. VIII. Die Systeme Ba2CaUO6—Ba2Gd0,67UO6 und Ba2CaUO6—Ba2Y0,67UO6 (1976)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 422 (1976), S. 115-133 
    Details
    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
    URL: http://dx.doi.org/10.1002/zaac.19764220204
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  • 9
    Electronic Resource
    Electronic Resource
    Über Perowskitphasen des Systems Ba2Y0,67U1-xWxO6 (1976)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 424 (1976), S. 211-228 
    Details
    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
    URL: http://dx.doi.org/10.1002/zaac.19764240305
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  • 10
    Electronic Resource
    Electronic Resource
    Schwingungsspektroskopische Untersuchungen an geordneten Perowskiten A2IIBMO6. I. MO6-Oktaeder: Symmetrie, Kraftkonstanten und Abstände (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 439 (1978), S. 35-47 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784390104
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