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Structural and magnetocaloric properties of novel gadolinium borohydrides

Author:
Pascal Schouwink  Emilie Didelot  Young-Su Lee  Thomas Mazet  Radovan Černý  


Journal:
Journal of Alloys and Compounds


Issue Date:
2016


Abstract(summary):

Abstract Novel Gd-based mixed-metal borohydrides A n Gd(BH 4 ) n+3 (A = K, Cs) are described in view of their magnetic cooling properties at cryogenic temperatures. The magnetic entropy changes correlate well with Gd 3+ isolation and structural dimensionality in the discovered perovskite-type and other compounds. Crystal structures are resolved from Synchrotron X-ray Powder Diffraction and refined with solid state calculations. The isolated Gd-centres in five-fold coordination in K 2 Gd(BH 4 ) 5 , the first representative of a new structure type, lead to exceptionally high mass magnetic entropy change of 54.6 J kg −1 K −1 at the maximum field change of 9 T. Graphical abstract Highlights • We investigate novel gadolinium borohydride salts in view of magnetic refrigeration. • DFT-optimized structural properties are correlated with magnetic entropy changes. • Two new 5-fold coordination polyhedra [Gd(BH 4 ) 5 ] 2− are discovered. • A large magnetocaloric effect is attained with the lightweight borohydride linker.


Page:
378-378


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