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Published on: February 7, 2017
Ternary Phase Diagram and Microstructures of Coordination Polymers
Karnjana Atthawilai1, Hiroyasu Tabe2, Mami Isobe2
1Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong 21210, Thailand.
Abstract:
We developed a ternary phase diagram and clarified the microstructures of the ternary materials consisting of three coordination polymers (CPs)/metal-organic frameworks (MOFs); Ag(GN)2(BF4) (1, GN = glutaronitrile), and Ag(PN)2(BF4) (2, PN = pimelonitrile), having two-dimensional structures, and Ag(AN)2(BF4) (3, AN = adiponitrile), having a three-dimensional structure. The three CPs all contain BF4- as counteranions immobilized inside the pores of the Ag+-dinitrile frameworks, and show reversible solid-liquid phase transitions without forming metastable phases such as glasses. The overall shape of the ternary phase diagram was depicted by combining the three binary phase diagrams. The detailed features in the diagram were explicitly identified by evaluating the phase transitions of ternary compounds by DSC and variable-temperature PXRD measurements, confirming that the eutectic temperature (Te) and ratio are 65 °C and 10.2820.3030.42, respectively. 10.2820.3030.42 solidified at 45 °C, forming a branched microstructure. The ternary compounds are applicable as latent heat-storage materials that store heat at 65 °C, and their reversible melting and solidification with high crystallinity result in the energy-recovery efficiency of 94% and cycle stability.
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