美国爱墨实验室和宇宙航天公司的工程师已制成一种利用磁致热效应的制冷装置。当金属磁化时,它就变热;当金属去磁后,它会冷却。该装置已连续工作75天,用的是一种稀有金属——钆,一种致冷物质,其磁致热效较大。据专家估计,应用该技术的冰箱,无论是在何地,只要温度范围在零下3.5℃至室 Engineers at American Love Laboratories and Aerospace have made a refrigeration device that uses magnetocaloric effects. When the metal is magnetized, it becomes hot; when the metal is demagnetized, it cools. The device has been working continuously for 75 days, using a rare metal - gadolinium, a refrigerant, which has a greater magnetocaloric effect. According to expert estimates, the application of the refrigerator, no matter where, as long as the temperature range of minus 3.5 ℃ to room