PrNi.sub.5 as a cryogenic refrigerant

Details PrNi.sub.5 as a cryogenic refrigerant PrNi.sub.5 as a cryogenic refrigerant

1975-10-20

1977-06-14

King, Lloyd L.

Refrigeration

Using electrical or magnetic effect

Thermoelectric; e.g., peltier effect

252462, F25B 2102, B01J 2310

Patent

active

040289052

ABSTRACT:
As a cryogenic refrigerant in an adiabatic demagnetization refrigerator, the intermetallic compound PrNi.sub.5 has been used to reach the millidegree Kelvin temperature range. The compound has a relatively large cooling entropy in this range and the specific heat peak, characteristic of materials of this class, occurs well below one millidegree. The material is easily solderable and is incorporated into a "cooling pill" by soldering to the metal wires or foils needed for producing thermal contact to the material to be refrigerated. The use of oriented crystals with their hexagonal axes perpendicular to the applied magnetic field is particularly advantageous. Suitable single phase PrNi.sub.5 bodies have been produced by annealing bulk melted samples, by Czochralski growth and by an extrusion method.

REFERENCES:
patent: 3004394 (1961-10-01), Fulton, Jr. et al.
patent: 3119236 (1964-01-01), Lutes
patent: 3125861 (1964-03-01), Jaep
patent: 3393526 (1968-07-01), Pearl
patent: 3638440 (1972-02-01), Lawless
patent: 3714539 (1973-01-01), Hampl, Jr.
patent: 3774404 (1973-11-01), Walker et al.
patent: 3800256 (1974-03-01), Garwin
patent: 3841107 (1974-10-01), Clark
patent: 3884726 (1975-05-01), Landecker

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