Results 261 to 270 of about 110,435 (294)

Bismuth Substitution in Yttrium Iron Aluminum Garnets

Journal of Applied Physics, 1964
Magnetic, crystallographic, and preparative data are reported on the system {Y2.75Bi0.25} Fe5−xAlxO12 for values of x to 1.50. For large x there appear to be differences in 0°K magnetic moment between this system and the straight yttrium analog, which imply that the replacement of Y3+ by the larger Bi3+ ions favors occupation of the tetrahedral sites ...
S. Geller, H. J. Williams, R. C. Sherwood, G. P. Espinosa   +3 more
openaire   +1 more source

Capping and Passivation of Aluminum Nanoparticles Using Alkyl-Substituted Epoxides

Langmuir, 2009
We report here on the synthesis and passivation of small (20-30 nm) aluminum nanoparticles using alkyl-substituted epoxides as capping agents. FTIR and 13C NMR spectroscopy indicate that the epoxides polymerize to form a polyether cap on the surfaces of the aluminum nanoparticles.
Chung, Stephen W., Guliants, Elena A., Bunker, Christopher E., Hammerstroem, Douglas W., Deng, Yong, Burgers, Mark A., Jelliss, Paul A., Buckner, Steven W.   +7 more
openaire   +3 more sources

Segregation Tendency in Layered Aluminum-Substituted Lithium Nickel Oxides

Chemistry of Materials, 2009
Conventional X-ray powder diffraction analyses of aluminum-substituted lithium nickel oxides showed pronounced broadening of the (11l) type peaks with increasing aluminum concentrations. It was postulated that a segregation tendency of nickel and aluminum in the layered lithium nickel oxide structure could lead to anisotropic strains and size effects ...
Croguennec, Laurence, Shao-Horn, Yang, Gloter, Alexandre, Colliex, Christian, Guilmard, Marianne, Fauth, F., Delmas, Claude   +6 more
openaire   +2 more sources

The Influence of Aluminum on Iron Oxides. Part XVI: Hydroxyl and Aluminum Substitution in Synthetic Hematites

Clays and Clay Minerals, 1992
AbstractSynthetic hematites with Al substitutions between 0 and 18 mol % were synthesized at different temperatures and water activities. The cell-edge lengths a for different synthesis conditions decreased linearly with increasing Al substitution. The regression lines, however, had different slopes and intercepts: the series with the highest synthesis
Helge Stanjek, Udo Schwertmann
openaire   +1 more source

The Influence of Aluminum on Iron Oxides: XI. Aluminum‐Substituted Maghemite in Soils and Its Formation

Soil Science Society of America Journal, 1984
Abstract Maghemites (γ‐Fe 2 O 3 ) from highly weathered soils had unit cell parameters significantly lower than pure maghemites. This was due to Al for Fe substitution in the cubic structure.
U. Schwertmann, H. Fechter
openaire   +1 more source

Mössbauer studies of nano-sized aluminum-substituted maghemites

Hyperfine Interactions, 1994
Several Al-maghemites prepared from Al-lepidocrocites have been studied by Mossbauer spectroscopy from 6 to 300 K, and also at 4.2 K with an applied field of 6 T. A linear decrease in the A and B site fields at 4.2 K for samples containing up to 10% of aluminum suggests a limit for the substitution.
G. M. da Costa, E. De Grave, A. M. Bryan, L. H. Bowen   +3 more
openaire   +1 more source

Effect of Substituted Aluminum in Magnesium Tension Twin

2011
Atomistic simulations are performed in order to study the Aluminum substitution effect on Magnesium twinning mechanism. Multiple twin boundaries are found in pure Mg single crystal under tensile loading condition along (1012) crystallographic direction. However, no twinning has occurred under compression loading. Al substitution has been done for 2, 5,
K. N. Solanki, A. Moitra, M. Bhatia
openaire   +1 more source

Hydrothermal synthesis of aluminum-substituted titanosilicate, ETS-10

Journal of Porous Materials, 2008
One of ETS-10 variants, aluminum-substituted ETAS-10 was successfully synthesized with Al/Ti molar ratio of 0.1–0.4 using different titanium sources, titanium sulfate (Ti(SO4)2) and titanium oxysulfate (TiOSO4). Through the compositional study, like ETS-10, the (Na + K)/Na molar ratio significantly affects the crystallinity and phase purity depending ...
S. D. Kim, S. H. Noh, Y. C. Kim, J. Y. Hwang, J. Y. Jung, Sung Churl Yi, W. J. Kim   +6 more
openaire   +1 more source

Nonlinear properties of aluminum-substituted lithium ferrite

AIP Conference Proceedings, 1975
Measuements have been taken on the ferromagnetic resonance properties of narrow linewidth single crystal aluminum‐substituted lithium ferrite at room temperature and in the frequency range from 4.0 to 9.0 GHz. The composition of the starting mixture was as follows: Li2CO3 29.35%; Fe2O3 55.33%; and Al2O3 15.32%.
openaire   +1 more source

Silyl‐substituted Aluminum‐triamide

Angewandte Chemie International Edition in English, 1963
J. Pump, E. G. Rochow, U. Wannagat
openaire   +1 more source