Zero thermal expansion in metal-organic framework with imidazole dicarboxylate ligands

• 作者: Qilong Gao Yixin Jiao Gang Li
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2022,（4）
• 所属期刊栏目: CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROP-ERTIES
• 页码范围: 623-625
• 页数: 3页
• 语种: 英文
• DOI: 10.1088/1674-1056/ac3ecf

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(DMPhH2IDC)2]n).It has the unique honeycomb structure with one-dimensional(1D)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 poly dentate 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.