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  • 1
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    Enhanced flux pinning in YBa2Cu3O7 layers by the formation of nanosized BaHfO3 precipitates using the chemical deposition method (2007)
    American Institute of Physics
    Details
    Publication Date: 2007-03-05
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Purfication, Purity, and Freezing Points of 20 API Standard and API Research Hydrocarbons (1957)
    s.l. : American Chemical Society
    Analytical chemistry 29 (1957), S. 361-364 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60123a009
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  • 3
    Electronic Resource
    Electronic Resource
    Studies on the Porous Disc Method of measuring and L. H. Osmotic Pressure (1931)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 35 (1931), S. 638-648 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150320a022
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  • 4
    Electronic Resource
    Electronic Resource
    Phase formation and martensitic transformation in mechanically alloyed nanocrystalline Fe—Ni (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1975-1980 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe—Ni alloys were prepared by mechanical attrition of elemental powders in a planetary ball mill in argon atmosphere. A nonequilibrium phase diagram of Fe100−xNix, mechanically alloyed at various milling intensities, is presented. Disordered body-centered-cubic and/or face-centered-cubic supersaturated solid solutions with a two-phase region are found. The maximum solubilities are 30 at. % Ni in Fe and 40 at. % Fe in Ni and decrease slightly with increasing milling intensity, i.e., processing temperature. Mechanically alloyed Fe—Ni is in a nanocrystalline state with an average grain size of 25–35 nm. The grain refinement is accompanied by an increase in atomic-level strain up to about 1% root-mean-square. This high internal strain affects predominantly the coercivity which is at least 4 A/cm even for single-phase alloys. The kinetics of the martensitic γ→α' transformation in mechanically alloyed nanocrystalline Fe—Ni are significantly modified in comparison to coarse-grained as-cast alloys. The nonequilibrium microstructure is assumed to hinder the growth of martensite which is confirmed by the investigation of the magnetic field-induced martensitic transformation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353162
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  • 5
    Electronic Resource
    Electronic Resource
    57Fe hyperfine fields and magnetic anisotropy of Sm2Fe17Nx interstitials with intermediate nitrogen concentrations : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6035-6037 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: From the compositional dependence of the hyperfine fields at the iron sites of Sm2Fe17Nx alloys with 0≤x≤2.94, evidence for cone anisotropy for x=0.4 and uniaxial anisotropy at least for x≥0.81 has been found. The analysis of the volume dependence of the hyperfine fields allowed us to separate contributions arising from the anisotropy of the orbital component of the iron moment and from the change of the spin moments owing to magnetovolume and bonding effects. The temperature dependence of the average hyperfine field and of the hyperfine fields at the four different nonequivalent Fe sites suggests weak itinerant ferromagnetism for Sm2Fe17N2.94.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353461
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  • 6
    Electronic Resource
    Electronic Resource
    Mechanically alloyed Sm-Co materials : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 6058-6060 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The preparation of SmCo5 magnets is based on a high-temperature heat treatment above 800 °C followed by a rapid cooling to room temperature. By mechanical alloying and a subsequent heat treatment, it is possible for the first time to prepare hard magnetic SmCo5 powder at low temperatures. The process involves first the formation of an amorphous precursor during milling, which then is transformed to the 1:5 structure at temperatures above 500 °C. The magnetically isotropic samples show a coercivity of 24 kA/cm and a remanence of 0.52 T. The process is also applicable to Sm2Co17. However, here the coercivity is less than 5 kA/cm and higher values require the formation of a precipitation-hardened microstructure. The stability of SmCo5 below 800 °C questions the eutectoid decomposition into Sm2Co17 and Sm2Co7.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347769
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic hardening of Sm-Fe-Ti alloys (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4951-4953 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The coercivity Hci of melt-spun Sm-Fe-Ti alloys can be increased to above 4.0 kA/cm by the addition of Zr and Co. Co-substitutions also enhance the remanence Jr and suppress the formation of α-Fe, both of which result in a high-energy product, (BH)max, of up to 56 kJ/m3, the highest value reported so far for 1:12-type magnets. In Sm20Fe70Ti10 alloys prepared by mechanical alloying or by rapid quenching a new hard-magnetic phase is observed with room-temperature coercivities of 40 and 33 kA/cm, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344744
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  • 8
    Electronic Resource
    Electronic Resource
    Coercivity of Sm-Fe-N ferromagnets produced by the mechanical alloying technique (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 6791-6797 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sm-Fe-N permanent magnets have been prepared by mechanical alloying of Sm and Fe powder and subsequently treating the material in a two-step process. Measurements of the minor hysteresis loops and of the initial magnetization curve were performed at room temperature. The reversible susceptibility (χrev), the total susceptibility (χtot) of the initial magnetization curve and of the demagnetization curve, and the temperature dependence of the coercive field (Hc) of a magnetically isotropic nanocrystalline Sm-Fe-N magnet have been measured up to a field strength of 6.4 MA/m. The anisotropy constants, K1 and K2, of Sm2Fe17Nx were deduced from the crystalline electric field calculation in the temperature range from 0 to 500 K. The critical diameter of single domain Sm-Fe-N particles was calculated to be 320 nm at room temperature. This leads to the conclusion that mechanically alloyed Sm-Fe-N is composed of single-domain particles. The temperature dependence of the coercive field of Sm-Fe-N has been analyzed within the framework of the micromagnetic models. It is concluded from these results that the nucleation process controls the coercivity mechanism of mechanically alloyed Sm-Fe-N material. The thermostability of the Sm-Fe-N magnet has also been tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355079
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  • 9
    Electronic Resource
    Electronic Resource
    Formation and magnetic properties of nanocrystalline mechanically alloyed Fe-Co and Fe-Ni : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6588-6590 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe100−xCox and Fe100−xNix powders were prepared by mechanical alloying of the elements in a planetary ball mill. They were investigated with respect to phase formation and magnetic properties using x-ray diffraction and measurements of the saturation magnetization and the coercivity. In both systems, disordered solid solutions were formed by mechanical alloying as proved especially by the measurement of the saturation magnetization. Moreover, nonequilibrium microstructures were established consisting in a nanocrystalline state (average minimum grain sizes 20–30 nm) accompanied by the introduction of considerable atomic-level strain (root mean square strain up to 1%). The soft magnetic behavior of this material shows some features of rapidly quenched nanocrystalline ribbons, but very low coercivities are prevented by a predominant influence of strain via magnetoelastic interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352573
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  • 10
    Electronic Resource
    Electronic Resource
    Formation and magnetic properties of nanocrystalline mechanically alloyed Fe-Co (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 1896-1900 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe100−xCox powders were prepared by mechanical alloying of the elements in a planetary ball mill. They were investigated with respect to phase formation and magnetic properties using x-ray diffraction, differential scanning calorimetry, and measurements of the saturation magnetization and the coercivity. The measurement of the saturation magnetization proved the true formation of the bcc (x≤80) and fcc (x=90) solid solutions by mechanical alloying. A nonequilibrium microstructure originates from a grain-size reduction to minimum 20–30 nm and the introduction of internal strain up to 1% (root-mean-square strain). An improvement in the soft magnetic properties by the nanocrystalline state, as hoped for, does not occur, because the high amount of internal strain together with the high saturation magnetostriction of the Fe-Co alloys causes relatively high coercivities of 5–40 A/cm. Grain growth and strain relaxation induced by controlled heat treatment of the as-milled powders allowed the separation of the influence on coercivity of the nanocrystalline structure from that of the internal strain: Below about 30 nm grain size, grain growth results in a pronounced coercivity increase superimposed on the general coercivity decrease caused by strain relaxation. This effect can be explained by the random anisotropy model describing the magnetization process in nanocrystalline ferromagnets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351177
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