摘要
采用脉冲激光沉积法在单晶SrTiO3(STO)基底上制备了La0.62Ca0.29K0.09MnO3(LCKMO)薄膜,通过调控基底温度获得了平整致密的膜层.利用二维面探X射线衍射仪和高分辨透射电子显微镜对薄膜结构进行了表征.结果表明,薄膜呈高质量取向外延生长,对应关系为{001}LCKMO||{001}STO.对薄膜的磁热性能研究表明,5 T下最大磁熵变为3.45 J/(kg·K),相对制冷效率为379.5 J/kg,磁熵半峰宽为110 K.
La0.62Ca0.29K0.09MnO3(LCKMO) film was epitaxially grown on the (001)SrTiO3(STO) single crystal substrate by pulsed laser deposition and a smooth and dense film was obtained by controlling the substrate temperature. The structure was characterized by 2D X-ray area detector and high resolution transmission electron microscopy, and the results indicate a high quality oriented growth of the film with the relationship of { 001 / LCKMO [ I { 001 / STO. At the magnetic field of 5 T, the maximum magnetic entropy change and relative cooling power of the film is 3.45 J/( kg . K) and 379.5 J/kg, respectively. A notable case is that the full width at half maximum of I ASu I is 110 K, which is desirable for the Ericsson cycle, the excellent magneto caloric effect of the LCKMO film reveals its great applicative potentialities as magnetic cooling refrigerant.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第9期2063-2067,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:90922034,21131002,21201075)
高等学校博士学科点专项科研基金(批准号:20110061130005)资助
关键词
磁热效应
外延膜
脉冲激光沉积
锰酸盐
Magnetocaloric effect
Epitaxial film
Pulsed laser deposition
Manganite