Data di Pubblicazione:
2012
Abstract:
Using Brillouin scattering, we measured the single-crystal elastic constants (Cij’s) of a prototypical
metal-organic framework (MOF): zeolitic imidazolate framework (ZIF)-8 [Zn 2-methylimidazolate 2],
which adopts a zeolitic sodalite topology and exhibits large porosity. Its Cij’s under ambient conditions
are (in GPa) C11 9:522 7 , C12 6:865 14 , and C44 0:967 4 . Tensorial analysis of the Cij’s reveals
the complete picture of the anisotropic elasticity in cubic ZIF-8.We show that ZIF-8 has a remarkably low
shear modulus Gmin & 1 GPa, which is the lowest yet reported for a single-crystalline extended solid.
Using ab initio calculations, we demonstrate that ZIF-8’s Cij’s can be reliably predicted, and its elastic
deformation mechanism is linked to the pliant ZnN4 tetrahedra. Our results shed new light on the role of
elastic constants in establishing the structural stability of MOF materials and thus their suitability for
practical applications
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
Jin-Chong Tan;Bartolomeo Civalleri;Chung-Cherng Lin;Loredana Valenzano;Raimondas Galvelis;Po-Fei Chen;Thomas Bennett;Caroline Mellot-Draznieks;Claudio Zicovich-Wilson;Anthony Cheetham
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