Abstract
We developed a new magnetic material R3T system, where R is a rare earth metal and T a transition metal, used as a regenerator matrix in a conventional two-stage Gifford-McMahon (GM) type cryocooler. These compounds, especially Er3Ni (Erbium 3 Nickel), possess extremely large heat capacities between 4 K and room temperature because of their low Debye temperatures, about 150 K, and broadened large peaks in specific heat due to complicated ferromagnetic or antiferromagnetic spin configurations near each transition temperature, for instance 7 K for Er3Ni. The specific heat of lead (Pb) used as a conventional regenerator matrix is too small to make it possible to produce refrigeration effectively in the temperature range between 4 and 15 K, because in most non-magnetic substance, such as lead, only the lattice vibrations and the conduction electrons make a contribution to the specific heat. In this paper, we present the thermal properties, especially specific heats, for the rare earth-3d transition metal (R-T) intermetallics rich in rare earth metal and the method of fabricating spherical particles for the newly developed regenerator matrix, which is useful for a conventional two-stage GM refrigerator.
Original language | English |
---|---|
Title of host publication | Advances in Cryogenic Engineering |
Publisher | Publ by Plenum Publ Corp |
Pages | 1175-1182 |
Number of pages | 8 |
Volume | 35 |
Edition | pt B |
ISBN (Print) | 0306435977 |
Publication status | Published - 1990 |
Externally published | Yes |
Event | Proceedings of the 1989 Cryogenic Engineering Conference. Part 2 (of 2) - Los Angeles, CA, USA Duration: 1989 Jul 24 → 1989 Jul 28 |
Other
Other | Proceedings of the 1989 Cryogenic Engineering Conference. Part 2 (of 2) |
---|---|
City | Los Angeles, CA, USA |
Period | 89/7/24 → 89/7/28 |
ASJC Scopus subject areas
- Engineering(all)