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  • ASTROPHYSICS  (30)
  • SPACECRAFT PROPULSION AND POWER  (23)
  • crystal structure  (7)
  • 1990-1994  (60)
  • 1
    Electronic Resource
    Electronic Resource
    Li2MnBr4(o-rh.) - eine geordnete NaCl-Defektstruktur des SnMn2S4-TypsProfessor Hans-Joachim Seifert zum 60. Geburtstag am 9. November 1990 gewidmet (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 592 (1991), S. 106-114 
    Details
    ISSN: 0044-2313
    Keywords: Dilithium manganese tetrabromide, Li2MnBr4 ; crystal structure ; neutron diffraction data ; MAPLE calculations ; Raman spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Li2MnBr4(o-rh.) - an Ordered NaCl Defect Structure of the SnMn2S4 TypeNeutron diffraction data of Li2MnBr4 at 25°C are presented. The orthorhombic room-temperature polymorph of Li2MnBr4 (space group Cmmm, Z = 2, a = 777.78(4), b = 1106.58(5), and c = 388.18(2) pm, RI = 6.7%) crystallizes in an ordered NaCl defect structure (SnMn2S4 type). The tetragonally distorted MBr6 octahedra are elongated in the case of LiBr6 and compressed for MnBr6 owing to the different sharing of these units. The crystal structure of Li2MnBr4 oC14 (and those of alternative structure models with a larger pseudotetragonal cell) are discussed with respect to X-ray intensities, Madelung part of lattice energy (MAPLE), and the Raman spectra. The symmetry coordinates and vibrational modes of the \documentclass{article}\pagestyle{empty}\begin{document}$ (\mathop {\rm k}\limits^ \to = 0) $\end{document} phonons of Li2MnBr4 oC14 are given.
    Notes: Die Kristallstruktur der Raumtemperaturmodifikation von Li2MnBr4 wurde mit Hilfe von Neutronenpulvermessungen bestimmt. Li2MnBr4(o-rh.) (Raumgruppe Cmmm, Z = 2, a = 777,78(4), b = 1106,58(5) und c = 388,18(2) pm, RI = 6,7%) kristallisiert in einer geordneten NaCl-Defekt-(bzw. Über-)struktur (SnMn2S4-Typ). Die MBr6-Oktaeder sind (mit unterschiedlicher Verknüpfung) tetragonal gestaucht (Mn) bzw. gestreckt (Li). Die Kristallstruktur von Li2MnBr4 oC14 (sowie von alternativen Strukturmodellen einer größeren pseudotetragonalen Zelle) wird unter Einbeziehung der Röntgenintensitäten, von Madelungenergien (MAPLE) sowie der Ramanspektren diskutiert. Die Symmetriekoordinaten und Schwingungsformen der Gitterschwingungen \documentclass{article}\pagestyle{empty}\begin{document}$ (\mathop {\rm k}\limits^ \to = 0) $\end{document} des Li2MnBr4 oC14 werden mitgeteilt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19915920112
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  • 2
    Electronic Resource
    Electronic Resource
    Schwermetall-π-Komplexe. IX. Die Kettenpolymere ∞1[(1,2- (CH3)2C6H4BiCl3)2], ∞1[(1,3) (CH3)2C6H4BiCl3)2] und ∞1[(1,4- (CH3)2C6H4BiCl3)2] (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1073-1082 
    Details
    ISSN: 0044-2313
    Keywords: Bismuth arene π-complexes ; bismuth xylene complexes ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heavy Metal π-Complexes. IX. The Chain Polymers ∞1[(1,2- (CH3)2C6H4BiCl3)2], ∞1[(1,3- (CH3)2C6H4BiCl3)2] and ∞1[(1,4- (CH3)2C6H4BiCl3)2]In the crystal structures of the three solid state complexes (C6H4(CH3)2BiCl3 (C6H4(CH3)2 = o-xylene: 1, m-xylene: 2, p-xylene: 3) quasi-dimeric units of almost undistorted, arene coordinated BiCl3 fragments can be found that are further associated via additional Bi—Cl contacts to form one-dimensional polymeric chains. Whereas the chains of 2 and 3 are constituted by Bi2Cl2 four-membered rings only, further Cl-bridging in 1 leads to additional trigonal-bipyramidal arrangements with Bi atoms exhibiting coordination numbers of 3 + 3 + 1 and 3 + 2 + 1, respectively (prim. + sec. Cl contacts + arene). The arene-metal bonding is characterized by Bi-arene distances in the range from 297 - 306 pm, including ring slippages of 24 -41 pm and 73 pm with the Bi atoms being six and seven coordinated, respectively. The direction of this slipping with respect to the arene's methylation sites cannot be understood in terms of electronic influences but is shown to be caused by steric demands. The values IP1 of the arenes prove to determine the colours of the complexes.
    Notes: In den Festkörperstrukturen der drei Komplexe (C6H4(CH3)2)BiCl3 (C6H4(CH3)2 = o-Xylol: 1, m-Xylol: 2, p-Xylol: 3) findet man quasidimere Einheiten fast unverzerrter, arenkoordinierter BiCl3-Fragmente, die über zusätzliche Bi—Cl-Kontakte zu eindimensionalen polymeren Ketten assoziiert sind. Während die Ketten von 2 und 3 nur aus Bi2Cl2-Vierringsegmenten bestehen, führt eine weitere Verbrückung in 1 zusätzlich zu trigonal-bipyramidalen Anordnungen mit Bi-Atomen der Koordinationszahlen 3 + 3 + 1 bzw. 3 + 2 + 1 (prim. + sek. Cl-Kontakte + Aren). Die Bindung des Arens an das Metall ist durch Bi-Aren-Abstände zwischen 297 und 306 pm charakterisiert. Die „ring slippage“ beträgt 24-41 bzw. 73 pm bei den sechsfach bzw. siebenfach koordinierten Bi-Atomen. Die Richtung dieser Verschiebung in bezug auf die Lage der Methylgruppen des Arens kann nicht auf elektronischer Basis interpretiert werden, sondern ist sterisch verursacht. Für die Farbe der Komplexe erweist sich IP1 des Arens als bestimmend.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190618
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  • 3
    Electronic Resource
    Electronic Resource
    Struktur einer kristallinen Hochtemperaturmodifikation des Calciumultraphosphats, CaP4O11, und die kristallographische Orientierungsbeziehung zur Raumtemperaturphase (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 766-770 
    Details
    ISSN: 0044-2313
    Keywords: CaP4O11 ; crystal structure ; orientation relation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure of a High Temperature Modification of Calciumultraphosphate, CaP4O11, and its Crystallographic Orientation Relation with Respect to the Room Temperature PhaseThe title compound was obtained by heating a mixture of CaCO3, P4O10 in excess and H3PO4 in excess as well to 500°C and annealing for 10 days. The Calciumultraphosphate, CaP4O11, transforms at 85°C in a hot nitrogen gas stream into a second modification with orthorhombic space group (Aba2), the structure of which was determined: a = 12.683 Å, b = 12.090 Å, c = 12.627 Å, Z = 8, layer structure, R = 0.034. The crystallographic orientation relation between the two phases of CaP4O11 was determined.
    Notes: Die Titelverbindung wurde durch Erhitzen von CaCO3 mit einem Überschuß an P4O10 und H3PO4 auf 500°C und anschließendes Tempern (10 Tage) erhalten. Das gebildete CaP4O11 wandelt sich im heißen N2-Strom bei 85°C in eine zweite CaP4O11-Modifikation um, deren Struktur bestimmt wurde: a = 12,683 Å, b = 12,090 Å, c = 12,627 Å, orthorhombische Raumgruppe Aba2, Z = 8, Schichtstruktur, R = 0,034. Die kristallographische Orientierungsbeziehung zwischen den beiden Phasen des CaP4O11 wurde ermittelt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200431
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Kenntnis des Natrium-tetrahydroxoaluminat-chlorids Na2[Al(OH)4]Cl (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 771-776 
    Details
    ISSN: 0044-2313
    Keywords: Tetrahydroxoaluminate chloride, Na2[Al(OH)4]Cl ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Sodium Tetrahydroxoaluminate Chloride Na2[Al(OH)4]ClThe hitherto unknown compound Na2[Al(OH)4]Cl was prepared by crystallisation from a NaCl containing sodium aluminate solution. According to the X-ray single crystal investigation (tetragonal, space group P4/nmm, a = 7.541 Å, c = 5.059 Å, Z = 2) the compound represents the first example of a crystalline hydroxoaluminate with monomeric [Al(OH)4]- anions. Cl- shows a quadratic anti prismatic coordination to 4 Na+ and over hydrogen bonds to 4 O2- while Na+ is octahedrally coordinated by 4 O2- and 2 Cl- (axial). The results of the crystal structure analysis are confirmed by 27Al and 23Na MAS NMR investigations. Na2[Al(OH)4]Cl decomposes at about 200°C without intermediates under formation of β-NaAlO2 and NaCl.
    Notes: Die bisher unbekannte Verbindung Na2[Al(OH)4]Cl wurde durch Kristallisation aus mit NaCl versetzter Natriumaluminatlösung erhalten. Entsprechend der Röntgenstrukturanalyse an einem Einkristall (tetragonal, Raumgruppe P4/nmm, a = 7,541 Å, c = 5,059 Å, Z = 2) liegt mit dieser Verbindung erstmals ein Beispiel für ein kristallines Hydroxoaluminat mit monomeren [Al(OH)4]--Anionen vor. Cl- ist quadratisch antiprismatisch mit 4 Na+ sowie über Wasserstoffbrückenbindungen mit 4 O2- koordiniert, während Na+ oktaedrisch von 4 O2- und 2 Cl- (axial) umgeben ist. Die Ergebnisse der Kristallstrukturanalyse werden durch 27Al- und 23Na-MAS-NMR-Messungen bestätigt. Na2[Al(OH)4]Cl zersetzt sich ohne Zwischenprodukte bei 200°C zu β-NaAlO2 und NaCl.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200432
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  • 5
    Electronic Resource
    Electronic Resource
    Die Kristallstruktur von Aza-closo-decaboran NB9H10Professor Wilhelm Preetz zum 60. Geburtstage gewidmet (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1191-1193 
    Details
    ISSN: 0044-2313
    Keywords: Aza-closo-decaborane ; NB9H10 ; synthesis ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Structure of Aza-closo-decaborane, NB9H10Aza-closo-decaborane(10), NB9H10, crystallizes in the space group P21/n. The NB9 skeleton forms a distorted bicapped tetragonal antiprism with the N atom in a capping position. The structural data are compared to those of aza-closo-dodecaborane(12), NB11H12.
    Notes: Aza-closo-decaboran(10), NB9H10, kristallisiert in der Raumgruppe P21/n. Das NB9-Gerüst bildet ein verzerrtes zweifach überdachtes tetragonales Antiprisma mit dem N-Atom in axialer Position. Die Strukturdaten werden mit denen von Aza-closo-dodecaboran(12), NB11H12, verglichen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200711
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  • 6
    Electronic Resource
    Electronic Resource
    Über die Bildung und Kristallstruktur von Mg(HSO4)2 · H2O (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 596 (1991), S. 167-171 
    Details
    ISSN: 0044-2313
    Keywords: Magnesium bis(hydrogensulfate) hydrate ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Formation and Structure of Mg(HSO4)2 · H2OMg(HSO4)2 reacts with water under formation of its monohydrate, Mg(HSO4)2 · H2O. This reaction proceeds crystallographically oriented and is reversible. Mg(HSO4)2 · H2O crystallized monoclinic in the space group P21/n, with the unit cell parameters a = 8.623(2), b = 5.014(1), c = 15.428(3) Å, β = 101.32(2)°, V = 654 Å3, Z = 4. The crystal structure of Mg(HSO4)2 · H2O consists of two types of SO3OH-tetrahedra connected over three common oxygen atoms with three different MgO6-octahedra. This motif forms layers parallel to the xy-plane. The layers are arranged at a distance of c/2 and are linked via hydrogen bonds which start from the water of crystallization situated between the layers.
    Notes: Mg(HSO4)2 bildet durch Wasseraufnahme das Monohydrat Mg(HSO4)2 · H2O. Diese Reaktion verläft kristallographisch orientiert und ist reversibel. Mg(HSO4)2 · H2O kristallisiert in der monoklinen Raumgruppe P21/n mit den Gitterkonstanten a = 8,623(2), b = 5,014(1), c = 15,428(3) Å, β = 101,33(2)°, V = 654 Å3, Z = 4. Die Kristallstruktur des Mg(HSO4)2 · H2O ist charakterisiert durch 2 Sorten von SO3OH-Tetraedern, die jeweils über drei gemeinsame Sauerstoffatome mit drei verschiedenen MgO6-Oktaedern verknüpft sind. Dieses Strukturmotiv bildet Schichten parallel zur xy-Ebene. Die Schichten folgen im Abstand von c/2 aufeinander und werden über H-Brücken miteinander verknüpft, die vom Hydratwasser ausgehen, das zwischen den Schichten positioniert ist.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19915960122
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  • 7
    Electronic Resource
    Electronic Resource
    Guanidiniumhexafluorometallate von Titan, Silicium, Germanium und Zinn. Guanidiniumpentafluorooxoniobat und Guanidiniumtetrafluorodioxowolframat (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 604 (1991), S. 77-83 
    Details
    ISSN: 0044-2313
    Keywords: Guanidinium hexafluorometallates ; guanidinium pentafluorooxoniobate ; guanidinium tetrafluorodioxowolframate ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Guanidinium Hexafluorometallates of Titanium, Silicon, Germanium, and Tin. Guanidinium Pentafluorooxoniobate and Guanidinium TetrafluorodioxowolframateThe title compounds were crystallized from the aqueous solutions of their fluorometallate respectively oxofluorometallate acids by adding of guanidinium fluoride solution. Their unit cells were determined and for [C(NH2)3]2 TiF6 its crystal structure was determined: s. g. Cm, a = 12.869 Å, b = 7.378 Å, c = 6.243 Å, β = 114.45°, layer structure, R = 0.0257. The unit cell parameters of [C(NH2)3]2 SiF6: a = 12.612 Å, b = 7.272 Å, c = 6.171 Å, β = 114.30°, of [C(NH2)3]2 GeF6: a = 12.773 Å, b = 7.343 Å, c = 6.202 Å, β = 114.38°, of [C(NH2)3]2 SnF6 : a = 12.972 Å, b = 7.439 Å, c = 6.356 Å, β = 114.14°, of [C(NH2)3]2 NbOF5:a = 12.987 Å, b = 7.425 Å, c = 6.326 Å, β = 114,25°, of [C(NH2)3]2 WO2F4:a = 12.941 Å, b = 7.396 Å, c = 6.256 Å, β = 114.33°.
    Notes: Die Titelverbindungen wurden aus den wässrigen Lösungen der jeweiligen Fluorometallat-bzw. oxofluorometallatsäuren nach Zugabe von Guanidiniumfluoridlösung als kristalline Verbindungen erhalten und ihre Gitterkonstanten bestimmt. Vom [C(NH2)3]2 Tif6 wurde die Kristallstruktur bestimmt: R.Gr. Cm, a = 12,869 Å, b = 7,378 Å, c = 6,243 Å, β = 114,45°, Schichtstruktur, R = 0,0257. Kristallographische Daten von [C(NH2)3]2 SiF6:a = 12,612 Å, b = 7,272 Å, c = 6,171 Å, β = 114,30°, von [C(NH2)3]2 GeF6:a = 12,773 Å, b = 7,343 Å, c = 6,202 Å, β = 114,38°, von [C(NH2)3]2 SnF6:a = 12,972 Å, b = 7,439 Å, c = 6,356 Å, β = 114,14°, von [C(NH2)3]2 NbOF5:a = 12,987 Å, b = 7,425 Å, c = 6,326 Å, β = 114,25°, von [C(NH2)3]2 WO2F4:a = 12,941 Å, b = 7,396 Å, c = 6,256 Å, β = 114,33°.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19916040111
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  • 8
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    Spectrally resolved Rayleigh scattering diagnostic for hydrogen-oxygen rocket plume studies (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Journal of Propulsion and Power (ISSN 0748-4658); 8; 5, Se; 935-942
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    NASA TECHNICAL REPORTS
  • 9
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    Selection effects and binary galaxy velocity differences (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Measurements of the velocity differences (delta v's) in pairs of galaxies from large statistical samples have often been used to estimate the average masses of binary galaxies. A basic prediction of these models is that the delta v distribution ought to decline monotonically. However, some peculiar aspects of the kinematics have been uncovered, with an anomalous preference for delta v approx. equal to 72 km s(sup-1) appearing to be present in the data. The authors examine a large sample of binary galaxies with accurate redshift measurements and confirm that the distribution of delta v's appears to be non-monotonic with peaks at 0 and approx. 72 km s (exp -1). The authors suggest that the non-zero peak results from the isolation criteria employed in defining samples of binaries and that it indicates there are two populations of binary orbits contributing to the observed delta v distribution.
    Keywords: ASTROPHYSICS
    Type: NASA, Marshall Space Flight Center, Paired and Interacting Galaxies: International Astronomical Union Colloquium No. 124; p 485-490
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  • 10
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    Interface issues for on-board propulsion systems (1994)
    In:  CASI
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    Publication Date: 2016-06-07
    Description: Integration issues associated with the use of new chemical and electric propulsion technologies are a primary concern to the user community. Experience indicates that integration impacts must be addressed to the satisfaction of both spacecraft builders and operators prior to the acceptance of new propulsion systems. The NASA Lewis Research Center (LeRC) conducts an aggressive program to develop and transfer new propulsion technologies and this includes a major effort to identify and address integration issues associated with their use. This paper provides an overview of integration issues followed by a brief description of the spacecraft integration program at LeRC.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Pennsylvania State Univ., NASA Propulsion Engineering Research Center, Volume 2; p 88-92
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