摘要
Exploring new abnormal thermal expansion materials is important to understand the nature of thermal expansion.Metal-organic framework(MOF)with unique structure flexibility is an ideal material to study the thermal expansion.This work adopts the high-resolution variable-temperature powder x-ray diffraction to investigate the structure and intrinsic thermal expansion in Sr-MOF([Sr(DMPhH_(2)IDC)_(2)]_n).It has the unique honeycomb structure with one-dimensional(1 D)channels along the c-axis direction,the a-b plane displays layer structure.The thermal expansion behavior has strong relationship with the structure,ZTE appears in the a-b plane and large PTE along the c-axis direction.The possible mechanism is that the a/b layers have enough space for the transverse thermal vibration of polydentate ligands,while along the c-axis direction is not.This work not only reports one interesting zero thermal expansion material,but also provides new understanding for thermal expansion mechanism from the perspective of the structural model.
作者
高其龙
焦怡馨
李纲
Qilong Gao;Yixin Jiao;Gang Li(Key Laboratory of Materials Physics of the Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450001,China;College of Chemistry and Green Catalysis Center,Zhengzhou University,Zhengzhou 450001,China)
基金
Project supported by the National Natural Science Foundation of China(Grant Nos.22071221 and 21905252)
the Natural Science Foundation of Henan Province,China(Grant No.212300410086)。