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Rare-Earth Garnets and Perovskites for Space-Based ADR Cooling at High T and Low H



T T. King, B A. Rowlett, R A. Ramirez, E R. Canavan, M J. DiPirro, J S. Panek, J G. Tuttle, Robert D. Shull, R A. Fry


Future NASA satellite detector systems must be cooled to the 0.1K temperature range to meet the stringent energy resolution and sensitivity requirements demanded by mid-term astronomy missions. The development of adiabatic demagnetization refrigeration (ADD) materials that can efficiently cool from the passive radiative cooling limit of difference} 30 K down to sub-Kelvin under low magnetic fields (Hless than or equal to} 3 T) would represent a significant improvement in space-based cooling technology. Governed by these engineering goals, our efforts have focused on quantifying the change in magnetic entropy of rare-earth garnets and perovskites. Various compositions within the gadolinium gallium iron garnet solid solution series and gadolinium aluminum perovskite have been synthesized via an organomettallic complex approach and confirmed with powder x-ray diffraction. The magnetization of the GGIG and GAP materials has been measured as a function of composition, temperature and applied magnetic field. The magnetic entropy change between O T and 3 T was determined form the magnetization data.
Advances in Cryogenic Engineering
No. 613B


adiabatic demagnetization refrigeration, gadolinium gallium, perovskites, rare-earth garnets


King, T. , Rowlett, B. , Ramirez, R. , Canavan, E. , DiPirro, M. , Panek, J. , Tuttle, J. , Shull, R. and Fry, R. (2002), Rare-Earth Garnets and Perovskites for Space-Based ADR Cooling at High T and Low H, Advances in Cryogenic Engineering (Accessed April 21, 2024)
Created February 28, 2002, Updated October 12, 2021