K. Tachikawa (auth.), R. P. Reed, F. R. Fickett (eds.)'s Advances in Cryogenic Engineering Materials : Part A PDF

By K. Tachikawa (auth.), R. P. Reed, F. R. Fickett (eds.)

ISBN-10: 1461398800

ISBN-13: 9781461398806

ISBN-10: 1461398827

ISBN-13: 9781461398820

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Extra info for Advances in Cryogenic Engineering Materials : Part A

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Eqs. 2h- 1n- 1I3 (9) (10) As before, eq. 10 is obtained for quasi-2 &quasi-l dimensions. 2 ,3 23 Table 1. Compari~on Material n Heavyelec. metal 1029/m3 Mettalic Supercond. 1029/m3 1028/m3 Ceramic Oxide Li-Be-H 5x1029/m3 MetallicH 103O/m3 Neutron 1043_ 1029/m3 Star of Estimated T c and 2 ,1. with Data for Wide Range of Matter Dim. Est. 04x109 Table 1 shows that eqs. 6 & 10 do well in representing experimental and calculated results over a range of T c and ,1. of 9 orders of magnitude. T c * is the experimental or literature value 4-12 of critical temperature.

5K. Similar curves were obtained for temperatures ranging from 3K to 12K. A plot of ~ at lT and 2T versus temperature shows that MI linearly decreases with temperature for T > 4K. 2K. OT for different temperatures is shown in Fig. 5 where the ratio M(t)/M1 is plotted against lnC Here too we observe that for a long time the decay is constant in lnC. Although the ratio of M(t)/MI decreases with T, it is found that the long time decay rate is independent of T for 3K < T < 12K. Details of these measurements is being published elsewhere.

EXPERIMENTAL PROCEDURES Magnetization measurements were carried out in a commercial SQUID magnetometer (Quantum Design), with the applied field normal to the wire sample. 05%. After a temperature is set, field is incremented gradually to avoid overshoot in H. At each field setting the superconducting magnet is switched into the persistent mode prior to measurement. Flux creep is measured during the hysteresis cycle by stopping at several magnet field values and measuring M over time lengths - 12000 secs.

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Advances in Cryogenic Engineering Materials : Part A by K. Tachikawa (auth.), R. P. Reed, F. R. Fickett (eds.)


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