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  • 1
    Electronic Resource
    Electronic Resource
    Effects of the relative proportion of ferromagnetic and charge-ordered phases on the metal–insulator transition temperature in La0.5Ca0.5Mn1−xGexO3 (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 7041-7044 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic and transport properties of rare-earth manganites La0.5Ca0.5Mn1−xGexO3 with 0≤x≤0.1 have been investigated systematically. Doping Ge at Mn sites increases the metal–insulator transition temperature (TP) from 124 to 210 K with increasing x from 0 to 0.08. The introduction of Ge severely destroys the charge-ordered state and hardly affects the ferromagnetic ordering. For low-doped samples, TP is also increased dramatically by the magnetic field, especially in the field-cooled mode. Magnetic analysis suggests the coexistence of the charge-ordered antiferromagnetic phase and the ferromagnetic phase. We propose that the proportion of the ferromagnetic phase and the charge-ordered phase can affect TP in phase-separated compounds. The phase diagram of La0.5Ca0.5Mn1−xGexO3 with 0≤x≤0.1 is presented. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1327600
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  • 2
    Electronic Resource
    Electronic Resource
    Colossal magnetoresistance in cluster glass-like insulator La0.67Sr0.33(Mn0.8Ni0.2)O3 (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5399-5401 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Substitution of Ni for Mn in La0.67Sr0.33MnO3 (LSMO) lowers the Curie temperature TC from 365 K for LSMO to 194 K for La0.67Sr0.33(Mn0.8Ni0.2)O3, which exhibits a cluster glass-like state. The oxide is insulating under both zero field and 60 kOe, but application of the magnetic field induces colossal magnetoresistance (CMR) especially at low temperature. Far below TC, the compound's field dependence of resistivity has a very similar shape with that of metallic perovskite manganite at relatively high temperature when the spin fluctuation grows stronger. The results indicate that the ferromagnetic superexchange between Ni and Mn, is helpful for the overall ferromagnetic exchange components just overcoming the generic antiferromagnetic exchange components, which leads to the presence of the cluster glass-like state. The reduction of the magnetic disorder and the suppression of the spin fluctuation in Mn–O layer by the external magnetic field are suggested to explain the CMR effect in this insulating compound © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369990
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  • 3
    Electronic Resource
    Electronic Resource
    Volume effects on the magnetic properties of R2Fe17-based quasiternary compounds (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 2012-2015 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structure and magnetic properties of the R2Fe17-based quasiternary compounds (R=Sm, Er, Gd, Y, Pr, Nd; M=Al, Ga) and their nitrides have been investigated. The saturation magnetization of R2Fe17−xMx compounds decreases with the increasing M content, while the M concentration dependence of the Curie temperature exhibits a maximum at about x=3.0 for the parent compounds. By nitrogenation the lattice parameters, the saturation magnetization, and the Curie temperature all have a corresponding increase compared with the parent alloys. The volume effects on the Curie temperature of these compounds have been studied. The d ln Tc/d ln V values were derived by comparing the change of the Curie temperature and volume before and after nitrogenation and show a linear dependence on the Curie temperatures for these systems investigated. This behavior can be quite well understood in terms of a combined model of localized and itinerant electrons suggesting more than 90% d electrons are localized, The same conclusion can be obtained from a analysis of the exchange field Hex dependence of the iron sublattice magnetization in the R2Fe17 compounds and their nitrides, and the iron proportionality constant VFe before and after nitrogenation. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361054
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  • 4
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of TbMn6−xAlxSn6 compounds (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 760-763 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the present work, the influence of the substitution of Al for Mn on the structure and magnetic properties of TbMn6−xAlxSn6 compounds was investigated. With increasing Al concentration the lattice constants a, c, and the unit-cell volume V decrease monotonically. The TbMn6−xAlxSn6 compounds exhibit ferrimagnetic ordering. The magnetic ordering temperature first decreases with increasing Al content up to x=1.5, then increases with further increasing Al content. As for the unsubstituted material, it was found that this series of compounds exhibits a second magnetic transition at lower temperature that is attributed to spin reorientation. The spin-reorientation temperature and the magnetic anisotropy field first decrease with increasing Al content, go through a minimum at x=0.5, then increase with further increasing Al content. The saturation magnetization decreases monotonically with increasing Al content. Two metamagnetic transitions are found in TbMn6Sn6 compounds, one at 0.44 T, and the other at about 0.16 T. With increasing Al content only one metamagnetic transition remains. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365855
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  • 5
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of Gd3(Fe1−xCox)25Cr4 compounds (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 4020-4022 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structural and magnetic properties of Gd3(Fe1−xCox)25Cr4 compounds with x=0–0.6 have been investigated. The structures of all the compounds investigated are found to possess monoclinic symmetry and belong to the A2/m space group. Substitution of Co for Fe leads to a clear contraction of the unit-cell volume. The Curie temperature increases from 492 K for x=0 to 762 K for x=0.6. The composition dependence of the saturation magnetization at 5 K reaches a maximum around x=0.3. It is noteworthy that substitution of Co for Fe results in a significant change of the magnetocrystalline anisotropy of the Co sublattice, and changes the easy magnetization direction of Gd3(Fe1−xCox)25Cr4 compounds from basal plane to easy axis. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123247
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  • 6
    Electronic Resource
    Electronic Resource
    Quantitative Determination of Aluminum by Precipitation with Urea (1937)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 9 (1937), S. 357-363 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac50112a001
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetocrystalline anisotropy of TbFe12−xTix single crystals (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 1170-1172 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: TbFe12−xTix single crystals have been investigated by means of magnetic measurements. With decreasing temperature, a spin-reorientation transition from easy axis to easy plane occurs. The rate of decrease of spin-reorientation temperature with x is about −380 K/Ti. There exists a strong magnetocrystalline anisotropy in the basal plane. The anisotropy field Ba between [100] and [110] for the compound TbFe11.15Ti0.85 is as high as 35 T which is about three times Ba in the axial direction. With increasing x, the easy magnetization direction at low temperatures in the basal plane changes from [110] for x=0.85 to [100] for x=1.0. The composition dependence of anisotropy can be understood in terms of a change of the crystal field parameters Anm due to substitution of Ti for Fe. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125973
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  • 8
    Electronic Resource
    Electronic Resource
    A Study of the Precipitation of Aluminum Basic Sulfate by Urea1 (1937)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 59 (1937), S. 1190-1196 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01286a010
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  • 9
    Electronic Resource
    Electronic Resource
    Preparation and crystal structure of diaquabis(1,8-naphthyridine-N-monoxide)nickel(II)nitrate (1990)
    Springer
    Journal of chemical crystallography 20 (1990), S. 515-517 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The title compound [Ni(napyo)2(H2O)2](NO3)2 was formed by the reaction of nickel(II) nitrate with 1,8-naphthyridine-N-monoxide (napyo) in ethanol medium. The complex crystallizes in the monoclinic, space groupP21/n withZ=2. Lattice parameters are:a=7.160(2),b=11.713(3),c=11.830(2) Å,β=95.11(3)°. The structure was determined from 1399 observed reflections and refined toR=0.061. The Ni atom shows a slightly distorted octahedral coordination, being bonded to two oxygen atoms and two nitrogen atoms of two napyo ligands and to two oxygen atoms of two water molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01221890
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  • 10
    Electronic Resource
    Electronic Resource
    Cadmium induces hypertrophy accompanied by increased myc mRNA accumulation in NRK-49F cells (1991)
    Springer
    Cell biology and toxicology 7 (1991), S. 401-411 
    Details
    ISSN: 1573-6822
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Previous studies showed that Cd++ inhibits EGF-induced DNA synthesis that not EGF-induced myc mRNA accumulation or amino acid incorporation into protein in serum-starved NRK-49F cells. In this study, flow cytometry was used to analyze the DNA and protein content of individual cells stimulated with Cd++ and/or epidermal growth factor (EGF). myc oncogene expression in these cells was also measured. It was found that, in both parental NRK-49F cells and in a clonal subpopulation, N1, Cd++ induces an hypertrophic response. In parental NRK-49F cells, however, lower doses of Cd++ (0.5 μM) induced more pronounced hypertrophic responses than did higher doses (4 μM); whereas in N1 cells, the Cd++-induced hypertrophic response shows a pattern of increasing response with doses of Cd++ from 0.5 to 4 μM. myc mRNA accumulation measured 2 hours after stimulation correlated with the hypertrophic responses in both NRK-49F cells and in N1 cells. The results show that Cd++-induced hypertrophy in NRK-49F cells is associated with increased myc oncogene mRNA accumulation, indicating that cell proliferation and cell hypertrophy may in part share common activation pathways.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00124074
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