南京理工大学学报（自然科学版）2024，Vol.48Issue(1)：96-103,8.DOI:10.14177/j.cnki.32-1397n.2024.48.01.010
基于冷冻铸造法制备直通孔La0.67Ca0.33MnO3磁制冷材料
Fabrication of La0.67Ca0.33MnO3 magnetocaloric materials with penetrative pores by freeze casting
摘要
Abstract
Magnetocaloric materials can hardly be fabricated into porous structures via conventional mechanical processing methods due to their intrinsic brittleness.Here we successfully fabricated La0.67Ca0.33 MnO3(LCMO)magnetocaloric materials with highly ordered pores via freeze casting.The influences of LCMO solid content on the microstructure,crystal structure,compositional distribution and magnetic properties of the freeze-cast samples were intensively studied by means of transmission electron microscope,scanning electron microscope,X-ray diffractometer,energy dispersive spectrometer and physical property measurement system.It has been found that the freeze-cast LCMO samples are characterized by tunable porosity,uniform chemical distribution and absence of secondary phases.Besides,an isothermal entropy change of 2.5 J·kg-1·K-1 is obtained in the freeze-cast LCMO samples under a field change of 0～1 T,which is comparable to that of the benchmark Gd magnetocaloric material.Therefore,the present work offers a new strategy for the fabrication of magnetocaloric materials with complex geometries,which may promote the practical application of the green and energy-efficient magnetic refrigeration technology.关键词
冷冻铸造/磁制冷/等温熵变/固相含量Key words
freeze casting/magnetic refrigeration/isothermal entropy change/solid content分类
信息技术与安全科学引用本文复制引用
缪雪飞,陈瑞彬,张恕豪,张云峰,王晨旭,徐锋..基于冷冻铸造法制备直通孔La0.67Ca0.33MnO3磁制冷材料[J].南京理工大学学报（自然科学版）,2024,48(1):96-103,8.基金项目
中央高校基本科研业务费专项资金(30922010802) （30922010802）
国家级大学生创新创业训练计划项目(202210288026) （202210288026）
国家自然科学基金面上项目(11974184) （11974184）
