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Exceptionally Low Shear Modulus in a Prototypical Imidazole-Based Metal-Organic Framework

Articolo
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
Autori di Ateneo:
CIVALLERI Bartolomeo
Link alla scheda completa:
https://iris.unito.it/handle/2318/101802
Link al Full Text:
https://iris.unito.it/retrieve/handle/2318/101802/15709/Tan_PhysRevLett.108.095502.pdf
https://iris.unito.it/retrieve/handle/2318/101802/15710/Tan_PhysRevLett.108.095502_s.pdf
Pubblicato in:
PHYSICAL REVIEW LETTERS
Journal
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URL

http://link.aps.org/doi/10.1103/PhysRevLett.108.095502
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