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  • 1995-1999  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic phase diagram of the FexMn0.6−xAl0.40 alloys series : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6155-6157 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This work shows preliminary results on the study of FexMn0.6−xAl0.40 alloys. It includes measurements of the temperature dependence of the ac susceptibility, zero field cooled magnetization, and Mössbauer spectroscopy. From the results obtained, the occurrence of reentrant spin glass behavior from a spin glass phase to an antiferromagnetic one for 0.2≤x≤0.35 and from a spin glass phase to a ferromagnetic one for the x=0.55 sample is proposed. Also, a normal spin glass transition was detected in the Fe range corresponding to 0.35≤x≤0.5. These results allow us to construct a magnetic phase diagram for the alloy series. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362057
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic properties of the FexMn0.70−xAl0.30 (0.40≤x≤0.58) alloy series (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 6165-6169 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of the FexMn0.7−xAl0.30 (0.40≤x≤0.58) alloy series have been investigated by means of 57Fe Mössbauer spectroscopy and ac magnetic susceptibility measurements. From our data, we propose a magnetic phase diagram for the system which is adequately reproduced by a diluted and random-bond Ising model which was analyzed on the basis of the mean-field renormalization-group method. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366500
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Description in a local model of the magnetic field distributions of Fe1−xNix disordered alloys : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4101-4103 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A local model based on the idea of atoms distributed within a crystalline lattice and following a binomial probability method for describing the hyperfine field distributions obtained from the room temperature Mössbauer spectra of the disordered Fe–Ni system is presented. This model allows one to calculate the mean hyperfine field for each concentration from 5 to 95 at. % Ni, to determine what are the most probable sites and to interpret why the mean hyperfine field initially increases and then decreases with the Ni concentration in the BCC phase. The results are in good agreement with the experimental results except for Invar composition and for 85 at. % Ni which demand a different treatment. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365564
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Spin glass behavior in some Fe–Mn–Al disordered alloys : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5267-5269 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this work, we report an ac susceptibility study of Fe0.5Mn0.2Al0.3, Fe0.5Mn0.1Al0.4, and Fe0.225Mn0.375Al0.40 disordered alloys. All the samples exhibit only one well defined peak near 58, 18, and 31 K, respectively. When the frequency of the ac field increases, the measured intensities of the peaks decrease and the maxima shift to higher temperatures, and when the dc field increases the intensity of the peaks decreases. This dependence of the position and intensity of the peaks on the field and frequency is evidence of the spin glass character of the transitions in these alloys. Mössbauer spectra at different temperatures were performed for the sample with 30 at. % Al and the plot of the adjusted mean hyperfine field versus temperature shows a kink at 53 K which is further evidence that this sample shows spin glass behavior. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364458
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  • 5
    Electronic Resource
    Electronic Resource
    A CEMS study of surface oxidation of Fe--Ni alloys (1997)
    Springer
    Hyperfine interactions 110 (1997), S. 7-10 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A study by Conversion Electron Mössbauer Spectroscopy (CEMS) carried out by using a Parallel Plate Avalanche Counter with samples of Fe--Ni alloys (50 and 65 at.% Fe) is reported. Each sample was analyzed without oxidation and after heating it under an oxygen atmosphere at 200°C. All CEMS measurements were carried out at room temperature. In both samples (50 and 65 at.% Fe), without oxidation and after oxidation, the Mössbauer spectra showed a six line magnetic spectrum according to their ferromagnetic character, with a broad Hyperfine Field Distribution (HFD), according to the disordered character of the alloys. The obtained Mean Hyperfine Field (MHF) for the sample 50 at.% Fe was 30.9 T, meanwhile for the invar composition (65 at.% Fe) was 25.5 T, which is close to values previously reported by Transmission Mössbauer Spectroscopy (TMS). Results from the treated samples (with oxidation at 200°C) showed a difference in the surface composition as a result of this process. In the 50 at.% Fe sample, additionally appeared a doublet that could be assigned to an oxihydroxide of Fe3+. Otherwise, the 65 at.% Fe sample (invar) presented ferromagnetic oxides (α-Fe2O3 and Fe3O4) with a large relative area (82.5%).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012698626865
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic phase diagram of the FexMn0.7-xAl0.3 alloys series obtained by Mössbauer spectroscopy (1997)
    Springer
    Hyperfine interactions 110 (1997), S. 177-182 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By Mössbauer spectroscopy the magnetic phase diagram of the FexMn0.7-xAl0.3 spin glass alloy has been obtained. X-ray diffraction (XRD) has shown that all the alloys are in the BCC phase. The broad spectral lines observed in the Mössbauer spectra are indicative of the disordered character of these alloys. Depending on the composition and the temperature the alloys behave as paramagnetic (P), ferromagnetic (F) and reentrant spin glass (RSG). For the alloys rich in iron the only detected magnetic transition is from F to P. For medium iron content two transitions were observed, namely from RSG to F and from F to P. The RSG phase is obtained as a consequence of the disordered character of the alloys and the competitive exchanges due to iron and manganese atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012658912752
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  • 7
    Electronic Resource
    Electronic Resource
    An autonomous programmable system for Mössbauer spectroscopy, accessed by a PC program (1997)
    Springer
    Hyperfine interactions 110 (1997), S. 135-141 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A low cost, stand alone microprocessed equipment for data acquisition and driver control, designed under the requirements of Mössbauer spectroscopy is described. It has a functional mode as pulse analyzer (PHA) and a second mode as a multichannel analyzer (MCA) while it generates waveforms -- triangular, sawtooth and sinusoidal -- between 2 and 40 Hz, buffered up to a capacity of 750 mA for velocity transducer (DRIVER) management, with PID signal synthesizer and error minimization circuits. Its resolution is variable, between 2 and 1024 channels. The system has CMOS technology of integration, Z-80--74HC, with a 4.9152 MHz crystal time based; its dead time is of 0.61 μs and its minimum dwell time is of 32 μs. Data are continuously kept in memory and can be transferred, under a managing program request, via RS-232c protocol at 9600 BAUD -- to a PC computer for its analysis and display. The program written for a PC is able to distinguish up to 8 different spectrometers by means of an identity number assigned to each unit. Therefore, the serial input may be multiplexed in order to attend all the systems, that can work simultaneously.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012650710935
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    Paper (German National Licenses)
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