Exceptionally low shear modulus in a prototypical imidazole-based metal-organic framework

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題名:	Exceptionally low shear modulus in a prototypical imidazole-based metal-organic framework
作者:	陳伯飛;Tan, Jin-Chong;Civalleri, Bartolomeo;Lin, Chung-Cherng;Valenzano, Loredana;Galvelis, Raimondas;Chen, Po-Fei;Bennett, Thomas D;Mellot-Draznieks, Caroline;Zicovich-Wilson, Claudio M;Cheetham, Anthony K
貢獻者:	地球科學學院地球科學學系
日期:	2012-02-29
上傳時間:	2026-04-23 11:33:35 (UTC+8)
出版者:	United States: American Physical Society (APS)
摘要:	摘要： Using Brillouin scattering, we measured the single-crystal elastic constants (C(ij)'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 C(ij)'s under ambient conditions are (in GPa) C(11)=9.522(7), C(12)=6.865(14), and C(44)=0.967(4). Tensorial analysis of the C(ij)'s reveals the complete picture of the anisotropic elasticity in cubic ZIF-8. We show that ZIF-8 has a remarkably low shear modulus G(min) < or approximately 1 GPa, which is the lowest yet reported for a single-crystalline extended solid. Using ab initio calculations, we demonstrate that ZIF-8's C(ij)'s can be reliably predicted, and its elastic deformation mechanism is linked to the pliant ZnN(4) 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. 其他題名： Phys Rev Lett 出版者： United States: American Physical Society (APS) 出版日期： 2012-02-29 出處： Physical Review Letters, 2012-02, Vol.108 (9), p.095502, Article 095502 資源來源： American Physical Society Journals 識別號： ISSN: 0031-9007 識別號： ISSN: 1079-7114 識別號： ISSN: 1092-0145 識別號： EISSN: 1079-7114 識別號： DOI: 10.1103/physrevlett.108.095502 識別號： PMID: 22463647
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