Abstract
A cylindrical powdered specimen of nominally equal weights of Ce(PO 3) 2 and Ba(PO 3) 3 glass was successfully adiabatically demagnetized to produce temperatures below 1 K. Absolute temperatures as low as 0·02 K were observed using a cerous magnesium nitrate magnetic thermometer. The Curie constant for this material was found experimentally to lie between the extremes 0·00189 ≤ λ ≤ 0·00224 by a comparison technique. The stability of cerium-barium metaphosphate glass against dehydration and attack by glycerine as well as its magnetic dilution capability (0 to 5·65 × 10 21 Ce 3− ions/cm 3) makes this substance attractive as a coolant material.
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