| 학회 | 한국재료학회 |
| 학술대회 | 2016년 봄 (05/18 ~ 05/20, 여수 디오션리조트 ) |
| 권호 | 22권 1호 |
| 발표분야 | B. 나노화학/바이오 재료 분과 |
| 제목 | Magnetocaloric effects of ceramic refrigerants for low-temperature range |
| 초록 | The magnetocaloric effect (MCE) is the reversible temperature change of a magnetic material associated with external magnetic field change in an adiabatic process. With this fundamental property, MCE can be applied to magnetic refrigerator, which does not use toxic gases and provides good energy efficiency. Magnetic refrigerators, therefore, are regarded as an environment-friendly green cooling technology and alternative technology to conventional gas compression refrigeration. In this study, the application of various ceramic refrigerants, having advantages in comparison with alloy candidates, were investigated for low working temperature of about 20 K. The samples were prepared via conventional ceramic solid-state reaction method and, for porous regrigerants, via ceramic foaming process with chemical solvents. Crystal structures and microstructures of ceramics were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Magnetocaloric properties were measured by physical property measurement system (PPMS) in magnetic field up to 20 kOe and temperature range down to 10 K. Among the ceramic candidates, rare-earth manganites REMnO3 (RE=Gd,Tb, Dy, Ho, Er), GdMnO3 showed remarkable magnetic entropy change at 20K, for instance, ΔS=3.2 J/kgK at 20K, H=2T. |
| 저자 | 조서현, 김종우, 류정호, 안철우, 최종진, 한병동 |
| 소속 | 재료(연) |
| 키워드 | <P>Magnetocaloric effect; magnetic refrigerants</P> |
