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  • 1
    Electronic Resource
    Electronic Resource
    ESR study of Cd(BrO3)2⋅2H2O single crystals γ irradiated at 300 and 77 K (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 639-644 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In Cd(BrO3)2⋅2H2O single crystals γ irradiated at 300 K, BrO2 and O−3 centers are observed. A correlation between the ESR and optical absorption studies has revealed that the optical absorption band for BrO2 lies around 470 nm. After γ irradiation at 77 K, a complex defect center identified as H⋅⋅⋅BrO3⋅⋅⋅HO could be observed. The chemical inequivalence and the effect of thermal or UV light bleaching on the populations of these centers are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448965
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  • 2
    Electronic Resource
    Electronic Resource
    Baker's yeast catalysed oxidative coupling of thiols to disulfides
    Amsterdam : Elsevier
    Bioorganic & Medicinal Chemistry Letters 1 (1991), S. 507-508 
    Details
    ISSN: 0960-894X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0960-894X(01)80454-6
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  • 3
    Electronic Resource
    Electronic Resource
    Structural, magnetic, and electrical properties of (Pr0.5Er0.5)2Fe17−xAlx (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 345-350 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An x-ray diffraction study of (Pr0.5Er0.5)2Fe17−xAlx (0≤x≤10) shows an expansion of its unit cell with x. The crystal structure changes from hexagonal Th2Ni17 to rhombohedral Th2Zn17 at x=6. The magnetic moment decreases by increasing the Al concentration. This effect may be due to the charge transfer from Al to the 3d band of Fe. The Curie temperatures are found to increase with Al up to x=3 and then decrease up to x=10, and the possible underpinning mechanisms are discussed. X-ray diffractograms of the magnetically aligned samples indicate that the easy magnetization directions of the samples with x=1,2,3, and 4 lie on a cone about the c axis. Electrical resistivity measurements show that the residual resistivity increases drastically with the Al concentration. The temperature coefficient of resistivity becomes almost zero for intermediate Al concentrations. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360836
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Ni substitution on the magnetic and electrical properties of Dy0.73Tb0.27Fe2 (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 4589-4594 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Alloys of Dy0.73Tb0.27Fe2−xNix [0≤x≤2] were prepared and the lattice parameters obtained at room temperature showed a deviation from Vegard's law owing to the presence of magnetovolume effect. Magnetization studies were carried out up to an applied field of 10 kOe in the temperature range 4.2–750 K. Magnetization data at 4.2 K indicate the effect of domain wall pinning. Temperature dependence of magnetization curves showed maxima at low temperatures as a consequence of this pinning effect. Electrical resistivity studies were carried out in the temperature range 16–750 K. A minimum observed for x=2 in the vicinity of its Curie temperature is attributed to the presence of critical fluctuations due to short-range spin ordering of the rare earths. All the samples, except x=2, showed a T2 dependence at low temperatures and this has been attributed to electron-spin wave scattering mechanism. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359423
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  • 5
    Electronic Resource
    Electronic Resource
    ac-susceptibility studies on Zr1−xHoxCo2 [0≤x≤1] system and their hydrides (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 2090-2093 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ac-susceptibility studies were carried out on the intermetallic compounds Zr1−xHoxCo2 [0≤x≤1] in the temperature range 13–300 K. The magnetic transition is found to be of the first-order type for HoCo2 (x=1.0) and second-order type for x=0.4–0.9. No magnetic ordering is observed for x=0.2 down to 13 K and x=0.0 is found to be Pauli paramagnetic. The magnetic ordering temperature (TC) increases from about 13 K for x=0.4 to 77 K for x=1.0. In addition, spin reorientation transitions are observed for x=0.9 and 1.0. On hydrogenation, TC is found to decrease considerably in all compounds. Hydrogen absorption in these compounds is found to weaken the exchange interactions which can be attributed to charge transfer effects. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358851
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic and electrical studies on Ho0.85Tb0.15Fe2−xNix system (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 5112-5116 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Cubic Laves phase alloys of Ho0.85Tb0.15Fe2−xNix (0≤x≤2) were prepared and the lattice parameters, evaluated as a function of x at room temperature, show deviation from Vegard's law. This was attributed to the presence of a magnetovolume effect and charge transfer. Magnetization measurements were performed in the temperature range 77–700 K. The results suggest that the system undergoes a gradual transition from ferri- to ferromagnetic with increasing x. This has been explained based on the 3d band model. Furthermore, a monotonic decrease in Curie temperature with x was observed. Electrical resistivity studies were carried out in the temperature range 16–700 K. An anomaly was found in the vicinity of the Curie temperature for x=2 which has been attributed to the existence of the long-range nature of the critical fluctuations due to short-range spin ordering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355287
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  • 7
    Electronic Resource
    Electronic Resource
    Concentration and temperature dependence of electrical resistivity in Zr1−xHoxCo2 (0≤x≤1) intermetallic compounds and their hydrides (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 3556-3561 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electrical resistivity studies have been carried out on the C 15-type Laves phase intermetallic compounds Zr1−xHoxCo2 (0≤x≤1) and their hydrides in the temperature range 16–300 K. The first-order magnetic transition occurring for x=1 disappears for lower Ho concentrations. Anomalies in the form of resistivity minima observed for the intermediate x values are attributed to the spin fluctuations in the vicinity of the magnetic ordering temperature. On hydrogen absorption, the first-order transition observed for x=1.0 as well as the anomalies observed for the other x values disappear at higher hydrogen concentrations. A concentration-dependent metal-semiconductor-like transition has been observed in all cases. This may be a consequence of charge transfer taking place between hydrogen and the 3d band, which leads to a strong decrease in the conduction electron density. The activation energy is evaluated from the ln ρ vs 1/T plots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357414
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  • 8
    Electronic Resource
    Electronic Resource
    Investigation of magnetic, magnetomechanical, and electrical properties of the Tb0.27Dy0.73Fe2−xCox system (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1380-1385 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: X-ray-diffraction studies carried out on Tb0.27Dy0.73Fe2−xCox (x=0,0.5,1.2,2.0) revealed that all compositions investigated retained the C-15 cubic Laves phase structure. Magnetization and electrical resistivity measurements were carried out in the temperature range 77–800 K. Anomalies observed in the resistivity measurements have been identified corresponding to spin reorientation transitions occurring in this system. Some of these transitions have also been observed in the magnetization data. Magnetostriction and magnetomechanical coupling coefficient were measured on samples of x=0, 0.5, and 1.2 prepared by arc melting as well as arc melting followed by zoning using an induction furnace. Magnetostriction and coupling coefficient were found to decrease with increase in cobalt concentration. Magnetostriction data on zoned samples revealed a change in the easy direction of magnetization from [111] to [100] in the case of x=0.5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353258
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetostriction and magnetomechanical coupling in Ho0.85Tb0.15Fe2−xCox system (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4450-4454 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetostriction and magnetomechanical coupling coefficient have been measured on Ho0.85Tb0.15Fe2−xCox (x=0, 0.5, and 1.2) alloys. The alloys were prepared by arc melting as well as by arc melting followed by zoning using induction furnace. Saturation magnetostriction (λs) and magnetomechanical coupling coefficient are found to decrease with the increase of cobalt concentration. The λs values of the zoned samples of x=0 and 0.5 are seen to be more than those of arc melted samples whereas, it is otherwise in the case of x=1.2. Magnetomechanical coupling coefficient values for all the samples are seen to increase with zoning. Change in the easy direction of magnetization in the case of x=1.2 is reflected in the magnetostriction of zoned samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349101
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  • 10
    Electronic Resource
    Electronic Resource
    57Fe Mossbauer studies on Ho0.85Tb0.15Fe2Hx and Dy0.73Tb0.27Fe2Hx (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 424-429 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 57Fe Mossbauer measurements were carried out on Ho0.85Tb0.15Fe2Hx (x=0–3.1) and Dy0.73Tb0.27Fe2Hx (x=0–3.3) in the temperature range 105–360 K. The hyperfine field at the iron site was found to increase slightly with increasing hydrogen concentration in both the systems. The temperature variation studies of the hyperfine fields, the quadrupole coupling constant and the isomer shift suggest the occurance of spin reorientation. The isomer shift studied as a function of concentration indicate the charge transfer from Fe to hydrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345275
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