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  • 1
    Electronic Resource
    Electronic Resource
    Über Nitridfluoride des Thoriums und des Zirkons (1966)
    Springer
    Naturwissenschaften 53 (1966), S. 551-551 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00602956
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  • 2
    Electronic Resource
    Electronic Resource
    Toward preparing students for change: A critical discussion of the contribution of the history of physics in physics teaching (1994)
    Springer
    Science & education 3 (1994), S. 99-130 
    Details
    ISSN: 1573-1901
    Source: Springer Online Journal Archives 1860-2000
    Topics: Natural Sciences in General
    Notes: Abstract In this paper I place physics teaching, and the inclusion of the history of physics into teaching, within a wide context. I start from the conviction that there are considerable changes ahead in the life circumstances of people in western industrial societies. This expectation should influence our aims of education generally, and in particular the aims of physics teaching. The paper does not offer final solutions, but analyses the situation and thereby argues for a change in perspective in physics teaching. The main idea is that physics teaching has to solve the problem of balancing seemingly incompatible needs, for example, conveying a stock of stable, dependable physics knowledge to students, and on the other hand to train them to see their physics knowledge within varying contexts of change. It is argued that the history of physics can be of high value in solving this problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486387
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  • 3
    Electronic Resource
    Electronic Resource
    Über eine argentometrische Methode zur Bestimmung der Unterphosphorsäure bei Gegenwart von Phosphaten und Phosphiten (1931)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 201 (1931), S. 347-352 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19312010132
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  • 4
    Electronic Resource
    Electronic Resource
    Über die quantitative Bestimmung der phosphorigen und der unterphosphorigen Säure (1931)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 201 (1931), S. 337-346 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19312010131
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  • 5
    Electronic Resource
    Electronic Resource
    Eine elektrometrische Methode zur Bestimmung von Unterphosphorsäure (1932)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 206 (1932), S. 125-128 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19322060113
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  • 6
    Electronic Resource
    Electronic Resource
    Über die quantitative Bestimmung der phosphorigen Säure, der unterphosphorigen Säure, der Unterphosphorsäure und der Phosphorsäure (1931)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 201 (1931), S. 353-360 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19312010133
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  • 7
    Electronic Resource
    Electronic Resource
    Ga8Ir4B - ein Gallium-Iridiumborid mit isolierten, annähernd quadratisch planaren Ir4B-Gruppen in einer vom CaF2-Typ abgeleiteten StrukturProfessor Hans-Uwe Schuster in memoriam (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 197-200 
    Details
    ISSN: 0044-2313
    Keywords: Gallium iridium boride ; crystal structure ; preparation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ga8Ir4B - a Gallium Iridium Boride with isolated, nearly square planar Ir4B Groups in a Structure derived from the CaF2 TypeThe new compound Ga8Ir4B (tetragonal, I41/acd, a = 853.69(2) pm, c = 2 105.69(6) pm, Z = 8, 614 reflections, 31 parameters, R = 0.034) was prepared by reaction of the elements at 1 100°C. The structure is derived from the CaF2 type. It contains isolated Ir4B groups with boron in an unusual, nearly square planar coordination.
    Notes: Die neue Verbindung Ga8Ir4B (tetragonal, I41/acd, a = 853,69(2) pm, c = 2105,69(6) pm, Z = 8, 614 Reflexe, 31 Parameter, R = 0,034) wurde durch Reaktion der Elemente bei 1 100°C dargestellt. Die Struktur läßt sich vom CaF2-Typ ableiten. Sie enthält isolierte Ir4B-Gruppen mit Bor in einer ungewöhnlichen, nahezu quadratisch planaren Koordination.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210206
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  • 8
    Electronic Resource
    Electronic Resource
    Sn5Ir6B2 und Sn4Ir7B3: Zinn-Iridiumboride mit eindimensionalen Ir/B-VerbändenFrau Professor Marianne Baudler zum 75. Geburtstag gewidmet (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 670-674 
    Details
    ISSN: 0044-2313
    Keywords: Tin iridiumborides ; crystal structure ; preparation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Sn5Ir6B2 and Sn4Ir7B3: Tin Iridiumborides with Onedimensional Ir/B Structural ElementsSn5Ir6B2 (hexagonal, P62m, a = 658.97(5) pm, c = 559.19(3) pm, Z = 1, 391 reflexions, 16 parameters, R = 0.037) and Sn4Ir7B3 (hexagonal, P63/m, a = 926.63(5) pm, c = 563.19(3) pm, Z = 2, 323 reflexions, 24 parameters, R = 0.045) were prepared by reaction of the elements. Their structures were determined by means of single crystal X-ray methods.The structure of Sn5Ir6B2 may be derived from the Fe2P type and contains columns of boron centered trigonal Ir prisms sharing their triangular faces. In the structure of Sn4Ir7B3 six of these columns are connected to form a large column with hexagonal cross section. Only every second prism therein is occupied by a boron atom. In both structures these onedimensional Ir/B structural elements are embedded in a matrix of tin atoms composed of Sn-centered Sn6 prisms twice as long as the Ir6 prisms.
    Notes: Sn5Ir6B2 (hexagonal, P62m, a = 658,97(5)pm, c = 559,19(3) pm, Z = 1, 391 Reflexe, 16 Parameter, R = 0,037) und Sn4Ir7B3 (hexagonal, P63/m, a = 926,63(5) pm, c = 563,19(3) pm, Z = 2, 323 Reflexe, 24 Parameter, R = 0,045) wurden durch Umsetzung der Elemente dargestellt, Ihre Strukturen wurden mit Röntgeneinkristallmethoden bestimmt.Die Sn5Ir6B2-Struktur kann vom Fe2P-Typ abgeleitet werden. Sie enthält Säulen aus trigonalen Ir-Prismen, die über die Dreiecksflächen verknüpft und von Boratomen zentriert sind. In der Sn4Ir7B3-Struktur sind jeweils sechs solcher Säulen aus Ir-Prismen über die Seitenflächen zu einer Säule mit sechseckigem Querschnitt zusammengefaßt. Darin ist nur jedes zweite Prisma mit Bor besetzt. In beiden Strukturen sind diese eindimensionalen Ir/B-Verbände in eine Matrix aus Zinnatomen eingelagert, die aus Sn-zentrierten Sn6-Prismen von der doppelten Länge der Ir6-Prismen aufgebaut ist.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220416
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  • 9
    Electronic Resource
    Electronic Resource
    Die Zinn-Rhodiumboride SnRh3B1-x, Sn4Rh6B und Sn5Rh6B2Professor Herbert Jacobs zum 60. Geburtstag gewidmet (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 2099-2106 
    Details
    ISSN: 0044-2313
    Keywords: Tin rhodium borides ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Tin Rhodium Borides SnRh3B1-x, Sn4Rh6B, and Sn5Rh6B2The new compounds SnRh3B1-x (x ∼ 0.2, tetragonal, P4/mbm, a = 570.31(2) pm, c = 835.99(8) pm, Z = 4, 514 reflexions, 26 parameters, R = 0.026), Sn4Rh6B (hexagonal, P63/mmc, a = 560.01(3) pm, c = 1367.5(1) pm, Z = 2, 746 reflexions, 17 parameters, R = 0.035), and Sn5Rh6B2 (hexagonal, P62m, a = 654.80(7) pm, c = 557.32(9) pm, Z = 1, 361 reflexions, 16 parameters, R = 0.039) were prepared by reaction of the elements. SnRh3B1-x crystallizes with the filled U3Si type of structure, a distortion variant of the cubic perovskite; the structure of Sn4Rh6B may be derived from the hexagonal perovskite BaNiO3. Both compounds contain nearly regular Rh6B-octahedra. Sn5Rh6B2 with the Sn5Ir6B2 type of structure contains isolated colums composed of trigonal Rh6B-prisms.
    Notes: Die neuen Verbindungen SnRh3B1-x (x ∼ 0,2, tetragonal, P4/mbm, a = 570,31(2) pm, c = 835,99(8) pm, Z = 4, 514 Reflexe, 26 Parameter, R = 0,026), Sn4Rh6B (hexagonal, P63/mmc, a = 560,01(3) pm, c = 1367,5(1) pm, Z = 2, 746 Reflexe, 17 Parameter, R = 0,035) und Sn5Rh6B2 (hexagonal, P62m, a = 654,80(7) pm, c = 557,32(9) pm, Z = 1, 361 Reflexe, 16 Parameter, R = 0,039) wurden durch Reaktion der Elemente dargestellt. SnRh3B1-x kristallisiert in einem aufgefüllten U3Si-Typ, einer verzerrten Variante des kubischen Perowskits; Sn4Rh6B läßt sich von der Struktur des hexagonalen Perowskits BaNiO3 ableiten. Beide Verbindungen enthalten nahezu reguläre Rh6B-Oktaeder. Sn5Rh6B2 ist isotyp mit Sn5Ir6B2 und enthält isolierte Säulen aus trigonalen Rh6B-Prismen.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966221218
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  • 10
    Electronic Resource
    Electronic Resource
    Sr2Ru7B8, ein Strontium-Rutheniumborid mit einer neuen, vom AlB2-Typ abgeleiteten KanalstrukturFrau Professor Marianne Baudler zum 70. Geburtstage am 27. April 1991 gewidmet (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 594 (1991), S. 57-65 
    Details
    ISSN: 0044-2313
    Keywords: Strontium Ruthenium Boride ; Crystal Structure ; Electrical Resistivity ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Sr2Ru7B8, a Strontium Ruthenium Boride with a New Channel Structure Derived from the AlB2-TypeThe strontium ruthenium boride Sr2Ru7B8 was prepared by reaction of the elements at 1 100°C (tantalum crucible sealed in a steel tube, excess of Sr). It crystallizes tetragonally in the space group P42/m with the lattice constants a = 644.4(1) pm, c = 1015.6(1) pm and Z = 2. The structure was determined by means of X-ray single crystal methods (four-circle diffractometer, MoKα, R = 0.034, Rw = 0.028, 1059 symmetrically independent reflections with I 〉 2σI, 37 variable parameters). Sr2Ru7B8 forms a new channel structure derivable from the AlB2 type by substitutions and shifting operations. The channels contain zig-zag chains of strontium atoms. They are running in the [100] and in the [010] directions in alternating layers. The boron atoms are arranged in pairs and in plane, branched B6 groups. The electrical resistivity is in the range from ϱ = 2.4 mΩ · cm (290 K) to ϱ = 0.8 mΩ · cm (4.2 K) (pressed and sintered rods, 4-probe DC method).
    Notes: Das Strontium-Rutheniumborid Sr2Ru7B8 wurde aus den Elementen bei 1100°C dargestellt (Ta-Tiegel, verschweißte Stahlampulle, Überschuß an Sr). Es kristallisiert tetragonal in der Raumgruppe P42/m mit a = 644,4(1) pm, c = 1 015,6(1) pm und Z = 2. Die Struktur wurde mit Röntgen-Einkristallmethoden bestimmt (Vierkreisdiffraktometer-Intensitäten, MoKα, R = 0,034, Rw = 0,028. 1059 symmetrieunabhängige Reflexe mit I 〉 2σI, 37 variable Parameter). Sr2Ru7B8 bildet eine neue, durch Substitutions- und Verschiebungsoperationen aus dem AlB2-Typ ableitbare Kanalstruktur aus. Die Kanäle, in denen sich Zick-Zack-Ketten aus Strontiumatomen befinden, verlaufen schichtweise abwechselnd in [100]- und in [010]-Richtung. Die Boratome bilden Paare und ebene, verzweigte B6-Gruppen. Der spezifische elektrische Widerstand liegt zwischen ϱ = 2,4 mΩ · cm (290 K) und ϱ = 0,8 mΩ · cm (4,2 K) (gepreßte und gesinterte Stäbchen, 4-Punkt-Gleichstrommethode).
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19915940107
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