Large isotropic negative thermal expansion in water-free Prussian blue analogues of ScCo(CN)6

We first found that ScCo(CN)(6) of Prussian blue analogues has a large isotropic negative thermal expansion which occurs in a wide temperature range from 25K to 600K. More intriguingly, the present material of ScCo(CN)(6) exhibits the merits of the facile fabrication via chemical coprecipitation and the good environment stability of water-free, which are very important for the applications. The transverse vibration of C and N atoms is critical for the occurrence of negative thermal expansion, which is confirmed by the atomic mean square relative displacements. The present new material of ScCo(CN)(6) will be promising for the applications. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.