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  • American Institute of Physics (AIP)  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Differential ac method of thermopower measurement (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 3053-3058 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new differential ac technique is described for rapid and continuous measurement of thermoelectric power of thin metallic ribbons over a wide temperature range. Sinusoidal heating of one thermocouple junction by means of a small resistive heater results in a measuring principle which eliminates spurious thermoelectric voltages in the lead wires and favorably benefits from ac signal processing. The resultant equilibrium temperature of the heated junction contains a constant term depending on thermal parameters of the system, and an oscillating term with a frequency-dependent amplitude. By choosing a suitable sample configuration no corrections are required for the thermal response of the system. By careful shielding of the measuring circuits and using modern lock-in amplifiers noise voltages can be reduced to less than 1 nV for measuring frequencies below 10 Hz. Measurements accurate to 1% are possible, using temperature differences smaller than 10 mK. The effectiveness of this technique is demonstrated by comparing our measurement of the thermoelectric power of an amorphous Fe80B20 alloy with measurements using conventional techniques and by studying the thermopower of an amorphous Fe90Zr10 alloy in the vicinity of its second-order magnetic phase transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139195
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  • 2
    Electronic Resource
    Electronic Resource
    Thin-film bolometer with fast response (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 276-278 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A short summary on recent developments in semiconducting temperature sensors is given. A thin-film germanium resistor is described in detail, which is used for fast and accurate thermometry in a nonadiabatic microcalorimeter. The use of only standard vapor deposition techniques makes this sensor also available to research groups lacking access to semiconductor technology. The general good performance and its good mechanical properties have the potential of numerous applications in fast and accurate low-temperature thermometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139321
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  • 3
    Electronic Resource
    Electronic Resource
    Specific heat of amorphous Ni80−xFexB16Si4 alloys (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3551-3553 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The specific heat of amorphous Ni80−xFexB16Si4 alloys has been measured in the temperature range of 1.5〈T≤25 K with 0≤x≤19. Assuming a Gaussian distribution of Schottky terms the specific heat was described satisfactorily in the whole temperature and iron concentration range. Anomalous behavior of θD and N(EF) was found near the critical concentration xc, for the onset of ferromagnetic ordering. The entropy Sm determined from the Schottky-like contribution of the specific heat shows a maximum at xc.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335003
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