Thermometric Properties of Carbon-Impregnated Porous Glass at Low Temperatures

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  • W. N. Lawless
    Corning Glass Works, Research & Development Laboratories, Corning, New York 14830

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<jats:p>Samples (4.8×1.6×1.0 mm) were cut from a plate of carbon-impregnated porous glass, encapsulated in He-filled Pt cans as two-lead devices, and their thermometric properties measured from 2 to 400 K. This material has a large sensitivity (R77/R300≅2.0, R4.2/R300≅130) combined with a relatively small resistivity (R4.2≃2100 Ω, R77≃34 Ω, R300≃17 Ω, for the samples' size), and d lnR/d lnT is smooth and monotonic over this temperature range. Repeatability of the two-lead device is ≃±0.8 mK at 4.2 K and &lt;±60 mK at 77 K, and no evidence of isothermal aging was observed. The magnetoresistance was measured at 4.2 K in fields up to 30 kG and found to be approximately twice as large as for carbon radio resistors at 4.2 K. Curve-fitting studies were made over increasingly larger temperature intervals (2–5, 2–10,…, 2–200 K) based on the equation log R=A+BT−P, and it was found that in each interval the R−T data could be fitted to better than 1% of the upper temperature. An interesting scaling relation was found between the R−T curves of the units, such that at each temperature, Ri=bRjm for the ith and jth units, where b and m are constants. This scaling could permit a two-point calibration transfer. It is postulated that the broad-range thermometric properties of this material derive from the high-purity carbon filaments deposited in the ∼40 Å pore-size porous glass.</jats:p>

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