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Uniaxial Negative Thermal Expansion and Mechanical Properties of a Zinc-Formate Framework

School of Physical Science and Technology, Xinjiang University, Urumqi 830046, China
School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
Department of Civil Engineering, The University of Sheffield, Sheffield S10 2TN, UK
Department of Physics and Mechanical & Electrical Engineering, Hubei University of Education, Wuhan 430205, China
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Dinesh Agrawal
Materials 2017, 10(2), 151;
Received: 2 January 2017 / Revised: 2 February 2017 / Accepted: 3 February 2017 / Published: 10 February 2017
PDF [2366 KB, uploaded 1 March 2017]


The thermal expansion behavior of a metal-formate framework, Zn(HCOO)2·2(H2O) (1), has been systematically studied via variable temperature single-crystal X-ray diffraction. Our results demonstrate that this formate exhibits significant negative thermal expansion (NTE, −26(2) MK−1) along its c-axis. Detailed structural analyses reveal that the large NTE response is attributed to the ‘hinge-strut’ like framework motion. In addition, the fundamental mechanical properties of framework 1 have been explored via nanoindentation experiments. The measured elastic modulus and hardness properties on the (00-2)/(100)/(110) facets are 35.5/35.0/27.1 and 2.04/1.83/0.47 GPa, respectively. The stiffness and hardness anisotropy can be correlated well with the underlying framework structure, like its thermoelastic behavior. View Full-Text
Keywords: metal-formate framework; negative thermal expansion; mechanical property metal-formate framework; negative thermal expansion; mechanical property

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Gao, H.; Wei, W.; Li, Y.; Wu, R.; Feng, G.; Li, W. Uniaxial Negative Thermal Expansion and Mechanical Properties of a Zinc-Formate Framework. Materials 2017, 10, 151.

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