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  • 1
    Electronic Resource
    Electronic Resource
    Radiation temperature scaling in indirect-drive hohlraums (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 3337-3344 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The hohlraum radiation temperature is studied for Gaussian laser pulses of order of 1 ns. The simulation results show that for this kind of pulse, the self-similar law of the radiation hydrodynamics is also valid in its time-rising phase. The scaling of the hohlraum radiation temperature as a function of laser parameter, hohlraum size, and x-ray conversion efficiency is obtained and the effect of laser entrance hole is included. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873573
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  • 2
    Electronic Resource
    Electronic Resource
    Strain-induced insulator–metal transition and room-temperature colossal magnetoresistance in low-doped La1−xBaxMnO3 thin films (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 6275-6279 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetotransport properties in low-doped La1−xBaxMnO3 thin films were investigated. The bulk La1−xBaxMnO3 (x=0.05 and 0.1) compounds are insulating, but an insulator–metal transition was observed in the strained thin films deposited on SrTiO3(100) substrates. At x=0.05, magnetization measurements revealed a transition from spin canting in bulk to ferromagnetic order in thin film. Moreover, a large magnetoresistance effect was obtained in the thin film with x=0.1 at room temperature and in a low magnetic field. A strain-induced modification of eg orbital stability was proposed to explain these properties. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1416866
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  • 3
    Electronic Resource
    Electronic Resource
    High coercivity of melt–spun Sm2Fe15Al2C1.5 compound : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5528-5529 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic hardening of melt–spun Sm2Fe17Cx was studied and the coercivity of 4.6 kOe for Sm2Fe17C1.5 alloys was reported a few years ago. Recently, we have succeeded in preparing single-phase compounds of Sm2(Fe, M)17Cx (M=Ga, Al, or Si) with high carbon concentration by arc melting. It was found that the substitution of Ga or Al not only facilitated the formation of high carbon concentration rare-earth iron compounds with a 2:17-type structure, but also was very effective in raising the value of the anisotropy field. For example, the sample of Sm2Fe15Al2C1.5 has a saturation magnetization of 110.2 emu/g, a Curie temperature of 576 K, and an anisotropy field of 111 kOe. It is known that melt spinning is an effective means to obtain high coercivity of magnetically hard materials. In this work, the hard magnetic properties of melt–spun Sm2Fe15Al2C1.5 alloys were investigated. It was found that the value of coercivity depends strongly on the quenching rates and an optimum coercivity of 9.4 kOe was obtained at the quenching rate of 20 m/s. X-ray diffraction patterns indicate that the as-quenched ribbons have a phase of the Th2Zn17-type structure. The high coercivity of these as-quenched ribbons originates from the excellent intrinsic magnetic properties of Sm2Fe15Al2C1.5. It can be concluded that the substitution of Al is very effective in raising the coercivity of melt–spun Sm2Fe15Al2C1.5 ribbons. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362299
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  • 4
    Electronic Resource
    Electronic Resource
    Mössbauer and x-ray diffraction studies of the phase composition of crystallized NdxFe81.5−xB18.5 alloys with 7≤x≤16 (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5709-5709 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In previous work, the phase composition of melt-spun Nd-Fe-B with a low Nd concentration (X≤6 at. %) have been extensively investigated by means of x-ray diffraction, spin echo nuclear magnetic resonance, and Mössbauer spectra. However, the phase composition of melt-spun Nd-Fe-B with intermediate and high Nd concentration has not been studied by Mössbauer effect. Based on the knowledge of the 57Fe hyperfine parameters for Nd2Fe14B, Nd1.1Fe4B4 and Nd2Fe23B3, the phases produced during annealing Nd-Fe-B amorphous alloys can be identified with greater sensitivity by Mössbauer spectroscopy than by x-ray diffraction. In the present work, a combination of x-ray diffraction experiments and Mössbauer spectroscopy has been performed on annealed NdxFe81.5B18.5 (7≤x≤16). It is found that the samples with 7≤x≤9 contain Nd2Fe23B3 metastable phase and Nd1.1Fe4B4 paramagnetic phase. The body-centered-cubic structure of Nd2Fe23B3 cannot generate the hard magnetic properties. The samples with 12≤x≤16 consist of Nd2Fe14B magnetically hard phase and Nd1.1Fe4B4 paramagnetic phase. The large coercivity for the high Nd content Nd-Fe-B originates from the very fine size of Nd2Fe14B crystallites below the critical size of single domain particle, which has a pinning domain wall effect. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362227
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  • 5
    Electronic Resource
    Electronic Resource
    Underpotential deposition of Cu on Au(111) in sulfate-containing electrolytes: A theoretical and experimental study (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 5699-5712 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We study the underpotential deposition of Cu on single-crystal Au(111) electrodes in sulfate-containing electrolytes by a combination of computational statistical-mechanics based lattice-gas modeling and experiments. The experimental methods are in situ cyclic voltammetry and coulometry and ex situ Auger electron spectroscopy and low-energy electron diffraction. The experimentally obtained voltammetric current and charge densities and adsorbate coverages are compared with the predictions of a two-component lattice-gas model for the coadsorption of Cu and sulfate. This model includes effective, lateral interactions out to fourth-nearest neighbors. Using group-theoretical ground-state calculations and Monte Carlo simulations, we estimate effective electrovalences and lateral adsorbate–adsorbate interactions so as to obtain overall agreement with experiments, including both our own and those of other groups. In agreement with earlier work, we find a mixed ((square root of)3×(square root of)3) phase consisting of 2/3 monolayer Cu and 1/3 monolayer sulfate at intermediate electrode potentials, delimited by phase transitions at both higher and lower potentials. Our approach provides estimates of the effective electrovalences and lateral interaction energies, which cannot yet be calculated by first-principles methods. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471769
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  • 6
    Electronic Resource
    Electronic Resource
    Characteristics of high quality tantalum oxide films deposited by photoinduced chemical vapor deposition (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 2299-2301 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method is presented for the photodeposition of tantalum oxide films from tantalum ethoxide and nitrous oxide using 172 nm radiation. The composition of the tantalum oxides deposited by this technique was determined by x-ray photoelectron spectroscopy while the optical and electrical properties were characterized using ellipsometry, capacitance–voltage, and current–voltage techniques. A leakage current density as low as 3.2×10−7 A cm−2 at a voltage of 10 V is obtained for the as-grown films. This is several orders of magnitude better than for any other Ta2O5 films deposited using either conventional or plasma-chemical vapor deposition techniques. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121803
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  • 7
    Electronic Resource
    Electronic Resource
    Microstructure and hard magnetic properties of nanocomposite Sm2Fe15Ga2Cx permanent magnets with an excess of Fe prepared directly by melt spinning (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 1110-1112 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nanocomposites Sm–Fe–Ga–C with low Sm contents have been prepared directly by melt spinning without a subsequent heat treatment. A highly isotropic remanence to saturation magnetization ratio of 0.6–0.7 and a relatively high coercivity of 5.5 kOe were achieved from the as-quenched ribbons. X-ray diffraction and thermomagnetic analyses show that the as-quenched ribbons consist of a magnetically hard phase Sm2Fe15Ga2Cx and a magnetically soft phase α-Fe. Transmission electron microscopy observation demonstrates that the major 2:17-type phase has larger crystallites and the crystallites of the minor phase α-Fe are smaller and located separately at the grain boundaries of the major phase. The remanence enhancement is attributed to the exchange coupling between the intergrains. Both microstructure and magnetic properties are found to depend sensitively on the substrate velocity. The effect of the microstructure on hard magnetic properties has been discussed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120939
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic properties of Sm2Fe17−xSix and Sm2Fe17−xSixC compounds (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 2637-2640 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Iron-rich intermetallic compounds Sm2Fe17−xSix and Sm2Fe17−xSixC (x=0, 1, 2, and 3) were studied. The as-prepared compounds are single phase with the rhombohedral Th2Zn17-type structure except for Sm2Fe17C and Sm2Fe16SiC which contain some amounts of α-Fe. The unit cell volumes and saturation magnetization at room temperature are found to decrease linearly with increasing Si concentration x. The Curie temperature Tc is found first to increase and then to decrease with increasing Si content. X-ray diffraction measurements on magnetically aligned powder samples show that the easy magnetization direction of the Sm2Fe17−xSix samples with x≤2 is planar while that of the sample with x=3 is conical. The Sm2Fe17−xSixC samples with x≤3 exhibit an easy c-axis anisotropy at room temperature. The anisotropy field is 83 kOe for x=0 and it rises to 110 kOe at x=1, and then drops with increasing Si concentration to 55 kOe at x=3. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358729
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  • 9
    Electronic Resource
    Electronic Resource
    Metastable Nd2(Fe1−xCox)23B3 (0≤x≤1.0) compounds with the 2:23:3-type structure : The 6th joint magnetism and magnetic materials (MMM)−intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6763-6765 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous Nd2(Fe1−xCox)23B3 (0≤x≤1.0) alloys were prepared by melt spinning at a speed of 47 m/s. When the amorphous samples were annealed at 900 K for 20 min, they crystallized to the metastable 2:23:3 single phase for all x. A detailed study of structure and magnetic properties of metastable Nd2(Fe1−xCox)23B3 compounds has been made by x-ray diffraction and magnetization measurements. They are body-centered cubic, and the lattice constant decreases linearly from a=14.16 A(ring) for x=0 to 13.86 A(ring) for x=1.0. The Fe atom moment μ¯Fe for Nd2(Fe1−xCox)23B3 was found to increase with x from 2.02μB for x=0 to 2.17μB for x=0.8, when the Co atom moment μ¯Co is assumed to be constant, as made in previous papers for crystalline Fe–Co alloys. The Curie temperature Tc is found to increase monotonically with increasing x from 659 K for x=0 to about 1218 K for x=1.0. The thermomagnetic measurements showed that when the Nd2(Fe1−xCox)23B3 compounds were heated to certain temperatures, they decomposed to Nd2(Fe,Co)14B and α-(Fe,Co) phases. The decomposition temperature of metastable compounds was about 990±15 K, and was almost independent of the Co concentration x.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358124
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  • 10
    Electronic Resource
    Electronic Resource
    Ga-concentration dependence of magnetocrystalline anisotropy in Gd2Fe17−xGax compounds (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 1385-1387 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structure and magnetic properties of arc-melted Gd2Fe17−xGax compounds were studied by means of x-ray diffraction and magnetization measurements. X-ray diffraction patterns demonstrate that all samples have a rhombohedral Th2Zn17-type structure and the substitution of Ga leads to an approximately linear increase in the unit cell volumes. The Curie temperature is found to first increase and then decrease with increasing Ga concentration. It is noteworthy that the substitution of Ga has a significant effect on the magnetic anisotropy of iron sublattice. The easy magnetization direction of Gd2Fe17−xGax compounds changes from basal plane to c axis with increasing Ga concentration. The sample with x=7 exhibits a uniaxial anisotropy. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360318
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