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  • 1
    Electronic Resource
    Electronic Resource
    Tetrafluorosulfate(1-) and tetrafluorooxosulfate(1-) radical anions (SF4- and SF4O-) (1993)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 115 (1993), S. 1129-1134 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00056a043
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  • 2
    Electronic Resource
    Electronic Resource
    Essential amino acid synthesis and nitrogen recycling in an alga–invertebrate symbiosis (1999)
    Springer
    Marine biology 135 (1999), S. 219-222 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract When aseptically-cultured sea anemones, Aiptasia pulchella, were incubated with 14C-labelled glucose, aspartate and glutamate, radioactivity was incorporated into animal protein. Radioactivity was recovered from all amino acids in the protein hydrolysates of A. pulchella bearing the symbiotic alga Symbiodinium sp., and from all but seven of the amino acids in A. pulchella experimentally deprived of their algae. These data suggest that these seven amino acids (histidine, isoleucine, leucine, lysine, phenylalanine, tyrosine and valine) may be synthesized by the symbiotic algae and translocated to the sea anemone's tissues; and that methionine and threonine, two amino acids traditionally considered as dietary essentials for animals, are synthesized by A. pulchella. Essential amino acid translocation from the symbiotic algae to the animal host is a core element in symbiotic nitrogen-recycling. Its nutritional value to the animal host is considered in the context of the amino acid biosynthetic capacity of the host.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050619
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  • 3
    Electronic Resource
    Electronic Resource
    Specific heat and magnetization of Co2−xSc1+xSn : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4812-4814 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co2ScSn crystallizes with the cubic L21 Heusler structure and is an itinerant ferromagnet with Tc=238 K. X-ray diffraction measurements show that Co2−xSc1+xSn retains the L21 crystal structure with an essentially unchanged lattice constant for 0≤x≤0.15. However, Tc determined from the magnetization measurements decreases monotonically with increasing Sc concentration from 238 K for x=0 to 40 K for x=0.11, and then remains at 40 K from x=0.11 to 0.14. The electronic specific heat coefficient γ is enhanced from 13 mJ/mole-K2 for Co2ScSn (x=0) to 30 mJ/mole-K2 for x=0.13 (Co1.87Sc1.13Sn). In addition, the C/T versus T2 plot shows a leveling-off behavior at low temperatures for the x=0.13 sample. The γ enhancement and level-off behavior observed when a system approaches a magnetic instability are discussed in terms of the self-consistent renormalization theory of spin fluctuations for weak itinerant ferromagnets and nearly magnetic systems. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361616
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic and thermodynamic properties of Sr2LaFe3O9 : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6608-6610 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the magnetization, specific heat, and 57Fe Mössbauer spectrum are presented for Sr2LaFe3O9. The temperature dependence of the specific heat and magnetization indicates that Sr2LaFe3O9 undergoes an antiferromagnetic transition at TN=203 K. The small entropy removal ΔS and small effective paramagnetic moment μeff suggest an itinerant character for the Fe moment in this compound. In low applied fields, the zero field cooled (ZFC) and field cooled (FC) magnetization below TN exhibit a hysteretic behavior indicating the existence of some ferromagnetic correlation. This behavior is suppressed by high applied fields. The 57Fe Mössbauer spectrum measured at 4.2 K for Sr2LaFe3O9 indicates two superimposed hyperfine fields of 260 and 450 kOe with area ratios of 1/3 and 2/3, respectively, consistent with previous measurements. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361898
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  • 5
    Electronic Resource
    Electronic Resource
    Structure and property of polycrystalline (Fe0.99Mo0.01)78Si9B13 alloys (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 4501-4505 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polycrystalline Fe-Mo-Si-B alloys with grain sizes of 15–200 nm were synthesized via crystallization of the amorphous alloy. Positron lifetime results show that there are two existing types of interfacial defects in nanocrystalline Fe-Mo-Si-B alloys, namely free-volume-sized defects and nanovoids. The free-volume-sized defect shows almost no change in size or density during grain growth, and has a mean lifetime smaller than that of its amorphous counterpart as a result of structural relaxation in the process of crystallization. However, abnormal changes in size and density of nanovoids with grain growth were noticed. It is of great interest that the variations of intermediate lifetime τ2 and intensity ratio I1/I2 with the average grain size D¯ are exactly compatible with those of microhardness. A lower density of nanovoids corresponds to a larger microhardness in the case of the present alloy system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354366
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  • 6
    Electronic Resource
    Electronic Resource
    Formation kinetics of nanocrystalline FeBSi alloy by crystallization of the metallic glass (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 654-656 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In order to clarify the formation mechanism of extremely fine-grained microstructures by crystallization of the FeBSi metallic glass, the nucleation and crystal-growth rates have been determined. The results indicate that the parabolic growth rate increases with annealing temperature, showing a maximum nucleation rate at an intermediate temperature range. Obviously it is possible to obtain nanocrystalline structures by controlling crystallization of the metallic glass on annealing at temperatures near the maximum nucleation rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355809
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  • 7
    Electronic Resource
    Electronic Resource
    Investigations on nanocrystalline Fe78B13Si9 alloys by positron annihilation spectroscopy (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 5124-5129 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polycrystalline Fe78B13Si9 alloys with nanoscale grain sizes prepared by the crystallization method have been studied by positron lifetime and Doppler-broadened line-shape measurements. The results obtained are different from those on amorphous or coarse-grained crystalline alloys with the same composition. When the grain sizes are clearly smaller than the mean positron diffusion length (L+(approximately-equal-to)100 nm), saturation trapping and annihilation of the positrons in the samples should occur at traps within the interfaces. There are two kinds of defects in the interfaces of the nanocrystalline FeBSi alloys, i.e., the free volumes (the size of which is slightly smaller than that of the amorphous counterpart) and the microvoids. The dependence of grain sizes on the type of interface defects and structure-sensitive properties has also been studied by positron spectroscopy. The measurements and comparison of the mean positron lifetime τ¯ and the Doppler parameter S on the nanocrystalline, amorphous, and coarse-grained crystalline alloys have given a satisfactory explanation for the relationship between the structure-sensitive properties, grain sizes, and crystalline states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352042
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  • 8
    Electronic Resource
    Electronic Resource
    Grain growth kinetics and interfacial energies in nanocrystalline Ni-P alloys (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7345-7347 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Grain growth process in nanocrystalline Ni-P alloys was investigated by use of differential scanning calorimetry and x-ray diffraction. Two exothermal peaks which result from grain growth processes of Ni3P and Ni crystallites, respectively, have been detected upon heating the nanocrystalline samples at constant heating rates. Activation energies for the two processes of grain growth were calculated by means of the relationship of grain growth temperature and heating rate using the Kissinger equation. Average interfacial energies of Ni3P/Ni3P grain boundary and Ni3P/Ni boundary were determined from the heat released during grain growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347591
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  • 9
    Electronic Resource
    Electronic Resource
    A new method for synthesizing nanocrystalline alloys (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 522-524 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new method to prepare nanocrystalline alloys was developed by means of crystallization from amorphous alloys. By using this method, a Ni-P alloy with 9 nm crystallites was synthesized. The structures and grain sizes of the alloy were examined by means of x-ray diffraction, transmission electron microscopy, and high resolution electron microscopy. Specific heat capacity and thermal expansion coefficient of the nanocrystalline Ni-P alloy prepared by this method were found to be greater than those of the coarse-grained crystalline alloy by 12.3% and 56.2%, respectively. A new micromechanism for nanometer-sized crystallites formation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347698
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  • 10
    Electronic Resource
    Electronic Resource
    Amorphous phase transition mechanism by the mechanical alloying of the Fe–W system (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 1967-1971 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Fe–W binary system exhibits a zero heat of mixing in the amorphous state. Thus, there is no chemical driving force for the crystal-to-amorphous transformation. However, the crystal-to-amorphous transition was observed in a mechanically alloyed mixture of pure Fe and W powders. A structural study by x-ray diffraction showed that supersaturated solid solutions of W in Fe [Fe(W) SSS] and Fe in W [W(Fe) SSS] were produced during the early stage of the mechanical alloying. Iron atoms were already totally involved in the solid-state amorphization reaction after 24 h of milling. The end products were W(Fe) SSS and amorphous Fe–W alloy. The amorphization by mechanical alloying of the Fe–W system is attributed to a solid-state amorphization reaction in which lattice distortion induced by supersaturation of W in Fe and a refinement of grain size may raise the free energy of Fe(W) SSS above that of the amorphous phase and make the Fe(W) SSS destabilize.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351192
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