自旋交叉和长程磁有序共存的非均相复合材料(英文)  

Heterogeneous composites with coexisting spin-crossover and long-range magnetic ordering

作　　者：李刚 张新宇 陈凤丽 张诚诚 高搏红 卫海燕 王新益 LI Gang;ZHANG Xin-Yu;CHEN Feng-Li;ZHANG Cheng-Cheng;GAO Bo-Hong;WEI Hai-Yan;WANG Xin-Yi(State Key Laboratory of Coordination Chemistry,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,China;School of Chemistry and Materials Science,Jiangsu Key Laboratory of Biofunctional Materials,Nanjing Normal University,Nanjing 210023,China)

机构地区：[1]南京大学化学化工学院,配位化学国家重点实验室,南京210023 [2]南京师范大学化学与材料科学学院,江苏省生物功能材料重点实验室,南京210023

出　　处：《无机化学学报》2023年第11期2197-2208,共12页Chinese Journal of Inorganic Chemistry

基　　金：国家重点研发计划项目(No.2018YFA0306002);国家自然科学基金(No.22273036,21973039);中央高校基本科研业务费专项资金(No.020514380302)资助。

摘　　要：采用一种简单的室温沉淀转化方法,有效制备了同时具有自旋交叉和长程磁有序性能的异质结构复合材料FeTrz@PB,其由[Fe(Htrz)_(2)(trz)]BF_(4)(Htrz=1H-1,2,4-三氮唑)和普鲁士蓝KFe^(Ⅲ)[Fe^(Ⅱ)(CN)_(6)](PB)构成。通过扫描电子显微镜、透射电子显微镜、粉末X射线衍射、FTIR、X射线光电子能谱、能量色散X射线分析、热重分析和磁性研究,对这些异质结构复合材料的可控生长过程进行了充分表征。复合材料中,PB颗粒的大小和FeTrz@PB的外观可以通过控制反应时间来进行有效调节。随着反应时间的增加,FeTrz@PB复合材料中PB相的比例逐渐增加。值得注意的是,磁性研究发现,这类材料具有室温以上自旋交叉(362~392 K)和低温下长程磁有序(约5.6 K)的共存。高自旋(HS)组分和场冷/零场冷的强度随着反应时间的增加而逐渐增加,而自旋交叉热滞回线的高度逐渐减小。A facile precipitation transformation method at room temperature was employed to efficiently prepare the FeTrz@PB heterostructural composites containing both[Fe(Htrz)_(2)(trz)](BF_(4))(Htrz=1H-1,2,4-triazole)and Prussian blue KFe^(Ⅲ)[Fe^(Ⅱ)(CN)_(6)]with the coexistence of spin crossover(SCO)and long-range magnetic ordering(LRMO).The controllable growth process of these heterostructural composites was fully characterized by scanning electron microscope,transmission electron microscope,powder X-ray diffraction,FTIR,X-ray photoelectron spectroscopy,energydispersion X-ray analysis,thermogravimetric analysis,and magnetic studies.The size of the PB particles and the appearance of FeTrz@PB can be tuned by controlling the reaction time.Increasing the reaction time leads to the increased ratio of the PB phase in the FeTrz@PB composites.Remarkably,magnetic studies on FeTrz@PB revealed the coexistence of SCO above room temperature(362-392 K)and LRMO at low temperatures(ca.5.6 K).The high spin(HS)fraction and ZFC/FC intensity gradually increased with the growth time,while the heights of the hysteresis loops decreased gradually.

关 键 词：自旋交叉 长程磁有序 沉淀转化 多功能磁性材料 

分 类 号：O614.811[理学—无机化学] TB33[理学—化学]