ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Thermal Conductivity of Polyimide/Carbon Nanofiller Blends (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 749-752 
    Details
    ISSN: 1013-9826
    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
    Notes: In efforts to improve the thermal conductivity (TC) of Ultem™ 1000, it was compoundedwith three carbon based nano-fillers. Multiwalled carbon nanotubes (MWCNT), vapor grown carbonnanofibers (CNF) and expanded graphite (EG) were investigated. Ribbons were extruded to formsamples in which the nano-fillers were aligned. Samples were fabricated by compression moldingwhere the nano-fillers were randomly oriented. The thermal properties were evaluated by DSC andTGA, and the mechanical properties of the aligned samples were determined by tensile testing. Thedegree of dispersion and alignment of the nanoparticles were investigated with high-resolutionscanning electron microscopy. The thermal conductivity was measured in two directions using theNanoflash technique
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.749.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Magnetic Phase Transitions in Quasi-One Dimensional Antiferromagnets: Ferrosilite, Fe〈sub〉2〈/sub〉Si〈sub〉2〈/sub〉O〈sub〉6〈/sub〉, and Hedenbergite, CaFeSi〈sub〉2〈/sub〉O〈sub〉6〈/sub〉 (1988)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 27-28 (June 1988), p. 235-242 
    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/2011/0528/02/03/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.27-28.235.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Elastic constants of sodalite Na4Al3Si3O12Cl (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1730-1731 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The elastic stiffness constants of sodalite Na4Al3Si3O12Cl (cubic, a=8.882 A(ring);Z=2), a framework-type aluminosilicate with cubo-octahedral cages, have been determined by an ultrasonic method. The measured values are C11,88.52(71); C12,38.70(50); and C44,36.46(33) GPa. Because of its structural flexibility, the bulk modulus KS(55.30 GPa) and shear modulus μ (31.30 GPa) values in sodalite are considerably smaller than those in densely packed cubic silicate structures such as spinel and garnet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102318
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Analbite → monalbite transition in a heat treated twinned amelia albite (1975)
    Springer
    Contributions to mineralogy and petrology 50 (1975), S. 211-216 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Amelia albite annealed at 〉 1080 °C for 3200 hrs by Duba and Piwinskii (1974) shows very fine twin lamellae (∼1 μm) after the albite law, suggesting that it once underwent transformation into monalbite. A fragment of this specimen was investigated at 27 °C, 300 °C, 550 °C, 800 °C and 930 °C using the high-temperature precession technique. As the temperature increases, the splitting angle of c *-axes (likewise c *-axes) of two twin individuals continues to decrease. The photographs taken at 930 °C show that these two splitting angles have converged to 0o, indicating completion of the transformation into monalbite. The transition point we observe supports the results of MacKenzie (1952) (920±20 °C) and Grundy et al. (1967) (930 °C) rather than those of Sueno et al. (1973) and Prewitt et al. (1974) (〉 1080 °C); the discrepancy is most likely due to the differences in the degree of Al-Si disorder of the samples used in the experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371041
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Aluminous orthopyroxene: Order-disorder, thermodynamic properties, and petrologic implications (1979)
    Springer
    Contributions to mineralogy and petrology 69 (1979), S. 375-385 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Orthopyroxene has two tetrahedral sites, designated A and B, and two octahedral sites, M1 and M2. Crystallographic studies of synthetic and natural orthopyroxenes (opx) suggest that the tetrahedral Al is ordered nearly completely in the B site, but the octahedral Al disorders between M1 and M2 sites with a preference for M1. If the ‘aluminum avoidance’ principle is obeyed, then the tetrahedral Si-Al ordering limits the Al substitution in opx to 25 mol%, thus leading to an end-member stoichiometry of Mg3Al2Si3O12 instead of MgAl2SiO6. The enthalpy of formation of these two components has been deduced from the available phase equilibrium data. The thermodynamic properties of the opx solid solution approximates ideal solution behavior more closely when treated in terms of the components Mg4Si4O12(QEn)-Mg3Al2Si3O12(Py) than when expressed in terms of the components Mg2Si2O6-MgAl2SiO6. A model has been developed for the octahedral disordering of Al as function of temperature and composition. These data enable calculation of the configurational entropy and molar entropy of Al-opx; distinction has been made between the cases of completely random mixing of Al and Si in the tetrahedral B site, and of random mixing without violation of the ‘aluminum avoidance’ principle. The second model yields entropy of the Mg3Al2Si3O12 end member which agrees almost exactly with the value derived from phase equilibrium data. The partial molal entropies of the Orthopyroxene components ‘QEn’ and ‘Py’ can be derived from these data; their implications with respect to the P-T slopes of Al2O3 isopleths for the equilibrium of Orthopyroxene with forsterite and spinel/garnet have been discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00372263
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    The crystal structure of CaFe3+SiAlO6 and the crystal chemistry of Fe3+—Al3+ substitution in calcium Tschermak's pyroxene (1986)
    Springer
    Contributions to mineralogy and petrology 92 (1986), S. 530-535 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The crystal structure of a synthetic CaFe3+Al-SiO6 pyroxene (20 kb, 1,375° C) with unit cell dimensions a=9.7797(16), b=8.7819(14), c=5.3685(5) Å, β=105.78(1)∘, space group C2/c has been refined by the method of least squares to an R-factor of 0.025 based on 812 reflections measured on an automatic single crystal diffractometer. The octahedral M1 site is occupied by 0.82 Fe3+ and 0.18 Al3+. Within the tetrahedral T site, Si4+ (0.50), Al3+ (0.41) and Fe3+ (0.09) ions are completely disordered, although submicroscopic domains with short-range order are very likely. The octahedral site preference energy of the Fe3+ ions with respect to Al3+ ions in CaFe3+AlSiO6 is about 10 kcal/mole, which is much higher than that found in Y3Al x Fe5−2O12 garnets. Topologically the structure of CaFe3+AlSiO6 is intermediate between that of diopside and calcium Tschermak's pyroxene, CaAlAlSiO6. For CaM3+ AlSiO6 clinopyroxenes an increase in the size of the M1 octahedron is accompanied by an increase in the average M2-0, bridging T-0 and 03-03′ distances and kinking of the tetrahedral chain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00374434
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Hilgardite and parahilgardite piezoelectric zeolite type phases (1977)
    [s.l.] : Nature Publishing Group
    Nature 270 (1977), S. 594-595 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Hilgardite is monoclinic, space group Aa, with cell dimensions: a = 11.438(2), b = 11.318(2), c = 6.318(1) A, (3 = 90.06(1); Z = 4. Parahilgardite is triclinic, space group PI with cell dimensions: a = 17.495(4), b = 6.487(1), c = 6 313(1) A, a = 60.77(1), P = 79.56(1), y = 83.96(2); Z = 3. The ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/270594a0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Direct observation of anti-phase domain structure in omphacite (1973)
    Springer
    Contributions to mineralogy and petrology 39 (1973), S. 239-245 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Single crystal electron diffraction patterns of an omphacite (CaNa, Mg2+, Fe2+, Al3+, Fe3+)Si2O6 from a glaucophane schist facies (type C) eclogite, Tiburon Peninsula, California show weak reflections violating the C2/c space group. Transmission electron microscopy with dark field imaging, using h+k = even reflections reveal no special features, while dark field viewing through certain superstructure reflections violating the C2/c space group (h k l, with h+k = odd and h 0 l with h and/or l odd) reveal anti-phase domains, 100 to 3000 Å in width. Diffraction contrast experiments show that these domains are related by a displacement vector R=1/2[110]. This displacement vector explains the origin of the domains in terms of ordering of various cations in the octahedral (M1 type) and polyhedral (M2 type) sites without any changes in the tetrahedral silicate chains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00383106
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Oriented transformation of grunerite to clinoferrosilite at 775° C and 500 bars Argon pressure (1971)
    Springer
    Contributions to mineralogy and petrology 30 (1971), S. 64-71 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A member of the grunerite series (Fe6.685Mn0.142Ca0.110Mg0.096) (Si7.968Al0.016)O22(OH)2, has been transformed to clinoferrosilite, amorphous silica and water at 775° C and 500 bars Argon pressure. Single crystal photographs of an oriented intergrowth of the amphibole and pyroxene show that the clinoferrosilite retains the cristallographic a, b and c axes of the original grunerite in the I2/m orientation and has the cell dimensions: a=9.77, b=9.08, c=5.30 Å, β=109.5°; space group P21/c. Mössbauer resonance spectroscopy confirmed the identity of the olinoferrosilite. A transformation mechanism requires a minimum of ionic movements in an acceptor region (7/8 of the total crystal), where pyroxene is formed by expulsion of protons and acceptance of Fe2+ ions; simultaneous destruction of donor regions provide the Fe2+ ions, the residue being silica and water. The formation of metastable clinoferrosilite rather than fayalite and quartz indicates the strong structural control imposed by the host grunerite structure on the nature of the transformation products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00373369
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Strong site preference of Co2+ in olivine, Co1.10Mg0.90SiO4 (1974)
    Springer
    Contributions to mineralogy and petrology 47 (1974), S. 131-140 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The crystal structure and site preference of Co2+ in a synthetic Co1.10Mg0.90SiO4 olivine have been determined from single crystal X-ray diffraction data collected on an automatic diffractometer. The R factor is 0.044 for 612 reflections. The site occupancies are: Ml site: Co 0.730±0.006; Mg 0.270; M2 site: Co 0.370, Mg 0.630. The Gibbs free energy change, ΔG° for the ion-exchange reaction between M1 and M2 sites is −4.06 kcals/mole, assuming ideal mixing at each set of sites. This energy may be called ‘site preference energy’ of Co2+ in olivine. The strong preference of Co2+ for the M1 site can be quantitatively explained by two competing forces: preference of ions larger than Mg2+ for the M2 site and stronger covalent bonding of transition metal ions at the M1 site. For Fe2+, Mg2+, these two effects nearly neutralize each other, explaining the lack of considerable cation-ordering in Fe-Mg olivines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00372114
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...