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  • 1990-1994  (6)
  • 1985-1989  (2)
  • 1980-1984  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Electronic properties of semiconducting FeSi2 films (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 1726-1734 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polycrystalline iron disilicide thin films are prepared by furnace annealing of electron-beam deposited iron layers. As substrates we use single-crystal silicon wafers, epitaxial silicon thin films on sapphire substrates, and low-pressure chemical vapor deposited polycrystalline silicon thin films on oxidized silicon wafers. X-ray diffraction indicates that orthorhombic β-FeSi2 is obtained for growth temperatures in the range 800–900 °C. Photothermal deflection spectroscopy reveals a direct band-gap of 0.85 eV. Optical transitions at energies above 1.4 eV are investigated by spectroscopic ellipsometry. Measurements of the subgap defect absorption, photoluminescence, conductivity, and of the Hall mobility suggest that lower growth temperatures yield material of better quality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346601
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  • 2
    Electronic Resource
    Electronic Resource
    Pseudopotential investigations on the molecules, copper silicides and stannides (1990)
    s.l. : American Chemical Society
    Inorganic chemistry 29 (1990), S. 860-868 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00329a057
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  • 3
    Electronic Resource
    Electronic Resource
    Pseudopotential calculations on alkali silicide clusters with Si2 and tetrahedral Si4 backbones (1988)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 110 (1988), S. 373-375 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00210a009
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  • 4
    Electronic Resource
    Electronic Resource
    In Situ X-Ray Powder Diffraction Study of Catalysts for Steam-Reforming of Alcohols (1994)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 166-169 (July 1994), p. 523-528 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/00/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.166-169.523.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Strukturen mit Polyanionen als Defektvarianten allgemeiner Strukturtypen (1983)
    Springer
    Mineralogy and petrology 32 (1983), S. 195-208 
    Details
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Summary The Eu2Sb3 structure was redetermined (R aniso =0.055, 2474hkl;R aniso =0.062, 1223 weak reflexions withk=2n+1). The structures of Eu2Sb3 and Ca2As3 are identical defect structures of a common trigonal-prismatic AB2 type, which links the arrangement of prims of the AlB2 type and the α-ThSi2 type. The two structures differ by the positions of additional bond breaks (without generation of new defects) and of additional bonds crossing unoccupied prisms yielding the formation of Sb 6 8− chains and As 4 6− +As 8 10− chains, respectively. A general scheme is given for trigonal-prismatic structures and their defect variants. The valence ruleE=(8−N)Z+N * d relates valence electron numberE, number of atomsZ and number of defectsd with the mean bond orderN of the structure or of a partial structure and with the mean electron counting of a defect,N *. This relation is applied to some examples and discussed.
    Notes: Zusammenfassung Die Struktur von Eu2Sb3 wurde neu bestimmt (R aniso =0,055, 2474hkl;R aniso =0,062, 1223 schwache Reflexe mitk=2n+1). Eu2Sb3 und Ca2As3 sind identische Defektvarianten eines gemeinsamen AB2-Typs, der das Bindeglied zwischen den Anordnungen von trigonalen Prismen des AlB2-und des α-ThSi2-Typs darstellt. Die beiden Strukturen unterscheiden sich nur durch die Positionen zusätzlich getrennter Bindungen (ohne Erzeugung neuer Defekte) und neu geknüpfter Bindungen durch unbesetzte Prismen hindurch, so daß Sb 6 8− bzw. As 4 6− und As 8 10− -Ketten entstehen. Ein allgemeiner Zusammenhang für Strukturen mit lückenlosen trigonalprismatischen Anordnungen und ihren Defektvarianten wird abgeleitet. Mit Hilfe der neuen ValenzregelE=(8−N)Z+N *·d werden die Anzahl der ValenzelektronenE und die Zahl der AtomeZ mit der mittleren ElektronenzahlN *, die durch einen Defekt gebunden werden, verknüpft. Diese Beziehung wird auf einige Beispiele angewandt und diskutiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081110
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  • 6
    Electronic Resource
    Electronic Resource
    Nodal surfaces of Fourier series: Fundamental invariants of structured matter (1991)
    Springer
    The European physical journal 83 (1991), S. 407-412 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Periodic Nodal Surfaces (PNS) of Fourier series are derived and classified as fundamental invariants of structured matter. Relationships to periodic minimal surfaces PMS and to periodic zero potential surfaces (POPS) are given. A basic set of cubic PNS is represented in arithmetic form. The special importance of the invariance of the zeros to the type of the potential is stressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313411
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  • 7
    Electronic Resource
    Electronic Resource
    Ein neuer Blick auf die ElektronenlokalisierungDiese Arbeit wurde vom Fonds der Chemischen Industrie, von der Deutschen Forschungsgemeinschaft, der Höchst AG, dem Bundesministerium für Forschung und Technologie sowie dem Natural Sciences and Engineering Research Council of Canada gefördert. Den Herren F.-X. Fraschio, M. Kohout und B. Miehlich (Universität Stuttgart) möchten wir für die Unterstützung bei der Computergraphik danken. Wir danken Prof. P. Fulde, Stuttgart, und Prof. W. H. E. Schwarz, Siegen, für wertvolle Hinweise. (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 103 (1991), S. 421-424 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19911030410
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  • 8
    Electronic Resource
    Electronic Resource
    Hydroxoverbindungen. 12. Kristallstruktur und Konstitution von Natrium-trihydroxozinkat Na[Zn(OH)3] bei 190 K (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 536 (1986), S. 137-146 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydroxo Compounds. 12. Crystal Structure and Constitution of Sodium Trihydroxozincate Na[Zn(OH)3] 1The crystal structure of the very sensitive sodium trihydroxozincate Na[Zn(OH)3] 1 has been determined at 190 K. Contrary to the observations of trigonal planar [Zn(OH)3]- anions at 298 K, the structure of 1 at lower temperatures is characterized by 1-dimensional chains ∞1[Zn(OH)2(OH)2/2]- with the much more plausible (distorted) tetrahedral coordination of the Zn atoms (P42bc—C4v 6; Nr. 106; a = 1083.9 pm; c = 530.8 pm; Z = 8; Zn—O = 194.3-200.5 pm). The H positions were determined unambigeously from the X-ray data in complete agreement with calculations of potential profiles. There are pronounced hydrogen bond distances present. The Na atoms are coordinated by (5+1) oxygen atoms (Na—O = 234.8-248.8 pm and 282.7 pm). The noncentric coordination of the atoms as well as the strong anisotropic and anharmonic temperature tensors indicate a second order phase transition between 190 K and 298 K.
    Notes: Die Kristallstruktur des gegen Hydrolyse sehr empfindlichen Natriumtrihydroxozinkats Na[Zn(OH)3] 1 wurde bei 190 K bestimmt. Während bei 298 K trigonal-planare [Zn(OH)3]--Anionen beobachtet wurden, ist die Struktur von 1 bei tieferen Temperaturen durch 1-dimensionale Ketten ∞1[Zn(OH)2(OH)2/2]- mit der wesentlich plausibleren (verzerrten) Tetraederkoordination der Zn-Atome charakterisiert (P42bc—C4v 6; Nr. 106; a = 1083,9 pm; c = 530,8 pm; Z = 8; Zn—O = 194,3-200,5 pm). Die H-Positionen wurden in Übereinstimmung mit Berechnungen der Potentialprofile aus den Beugungsdaten bestimmt. Es treten ausgeprägte H-Brückenbindungen auf. Die Na-Atome sind von (5+1) O-Atomen koordiniert (Na—O = 234,8-248,8 pm, sowie 282,7 pm). Die azentrische Koordination aller Atome, sowie die anisotropen bzw. anharmonischen Tensoren lassen vermuten, daß zwischen 190 K und 298 K ein Phasenübergang 2. Ordnung stattfindet.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865360516
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  • 9
    Electronic Resource
    Electronic Resource
    Hydroxoverbindungen. 9. Barium-Oxohydroxostannat(II) Ba[SnO(OH)]2 (1983)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 499 (1983), S. 109-116 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydroxo Compounds. 9. Barium Oxohydroxostannate(II) Ba[SnO(OH)]2The pale yellow barium hydroxostannate(II), to which different stoichiometries have been assigned in the past, is now identified doubtlessly as Ba[SnO(OH)]2. The compound crystallizes in the monoclinic space group P21 (a = 759.4(2) pm, b = 576.2(1) pm, c = 717.4(2) pm, β = 107.67(2)°, Z = 2, R = 0.038, 645 Ihkl) and exhibits a typical layer structure. Ba[SnO(OH)]2 contains a new structural element in tin(II) chemistry, which is a one dimensional polyanion ∞1[SnO(OH)]- with syndiotactical conformation. In the context with the structures of two Na-hydroxostannates(II) which were characterized recently, the polyanion can be looked at as an intermediate condensation product of a (topotactical ?) reaction to SnO which all known hydroxostannates(II) undergo.
    Notes: Das blaßgelbe Bariumhydroxostannat(II), dem früher unterschiedliche Formeln zugeschrieben wurden, konnte nunmehr eindeutig als Ba[SnO(OH)]2 identifiziert werden. Die Verbindung kristallisiert monoklin in P21 (a = 759,4(2) pm, b = 576,2(1) pm, c = 717,4(2) pm, β = 107,67(2)°, Z = 2, R = 0,038, 645 Ihkl) mit einer ausgeprägten Schichtstruktur. Ba[SnO(OH)]2 enthält das für Sn(II)-Verbindungen neue Strukturelement eines eindimensional unendlichen Polyanions ∞1[SnO(OH)]- mit syndiotaktischer Konformation. Im Zusammenhang mit den Strukturen der kürzlich charakterisierten Na-Hydroxo-Stannate(II) kann das Polyanion als intermediäres Kondensationsprodukt einer (topotaktischen ?) Bildung von SnO angesehen werden, der alle bisher bekannten Hydroxostannate(II) unterliegen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19834990413
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  • 10
    Electronic Resource
    Electronic Resource
    Hydroxoverbindungen. 10. Über die Natriumoxohydroxostannate(II) Na4[Sn4O(OH)10] und Na2[Sn2O(OH)4] (1983)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 499 (1983), S. 117-129 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydroxo Compounds. 10. The Sodium Oxohydroxostannates(II) Na4[Sn4O(OH)10] and Na2[Sn2O(OH)4]Na4[Sn4O(OH)10] = Na4[Sn(OH)3]2[Sn2O(OH)4] (I) and Na2[Sn2O(OH)4] (II) have now been doubtlessly characterized as the first Na-hydroxostannates(II). I crystallizes monoclinic in P21/n (a = 1522.4(5) pm, b = 830.0(2) pm, c = 1276.0(3) pm, β = 104.8(2)°, Z = 4, R = 0.047, 1137 Ihkl); II crystallizes orthorhombic in P212121 (a = 1450(2) pm, b = 1665(2) pm, c = 590.7(8) pm, Z = 8, R = 0.042, 1208 Ihkl). II is identical with the compound which was described up to now as “Na[Sn(OH)3]”. The new compounds contain the complex anions [Sn(OH)3]- and [Sn2O(OH)4]2-, whose structures are now proved. The oxotetrahydroxo-distannate(II) anion [Sn2O(OH)4]2- exhibits a syn-conformation with respect to the projection along the (Sn—Sn) vector. The two compounds crystallize with pronounced layer structures, which show direct topotactical relations with one another as well as with SnO. This relates closely to the fast formation of SnO from crystals of I and II.
    Notes: Na4[Sn4O(OH)10] = Na4[Sn(OH)3]2 · [Sn2O(OH)4] (I) und Na2[Sn2O(OH)4] (II) wurden jetzt als erste Na-Hydroxostannate(II) eindeutig charakterisiert. I kristallisiert monoklin in P21/n (a = 1522,4(5) pm, b = 830,0(2) pm, c = 1276,0(3) pm, β = 104,8(2)°, Z = 4, R = 0,047, 1137 Ihkl); II kristallisiert orthorhombisch in P212121 (a = 1450(2) pm, b = 1665(2) pm, c = 590,7(8) pm, Z = 8, R = 0,042, 1208 Ihkl). II ist definitiv identisch mit der bisher als „Na[Sn(OH)3]“ angegebenen Verbindung. Die Verbindungen enthalten die komplexen Anionen [Sn(OH)3]- und [Sn2O(OH)4]2-, welche erstmals strukturell gesichert wurden. Das Oxotetrahydroxo-distannat(II)-Anion [Sn2O(OH)4]2- liegt stets in einer syn-Konformation bezüglich der Projektion längs des Vektors (Sn—Sn) vor. Beide Verbindungen bilden ausgeprägte Schichtstrukturen, die enge topotaktische Beziehungen untereinander wie auch zu SnO erkennen lassen. Hiermit korrespondiert die schnelle Ausscheidung von SnO an Kristallen von I und II.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19834990414
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