Author:
Yakovenko Andrey A.,Chapman Karena W.,Halder Gregory J.
Abstract
In situsynchrotron powder diffraction has been used to probe the pressure-dependent structural properties of the magnetic molecular framework material Co(dca)2[dca = dicyanamide or N(CN)2−]. An orthorhombic (Pmnn) to monoclinic (P21/n) transformation to a high-pressure phase, namely γ-Co(dca)2, occurs at 1.1 GPa. Structural determination of γ-Co(dca)2shows that the rutile-like topology of the pristine material is retained at high pressures, with the lower symmetry allowing a progression of volume-reducing structural distortions. γ-Co(dca)2was stable at the maximum pressure measured of 4.2 GPa. Both phases were soft, with bulk moduli (B0) for α-Co(dca)2and γ-Co(dca)2of 13.15 (18) and 9.0 (6) GPa, respectively. Modest uniaxial negative linear compressibility (K) of the order of −4 TPa−1was observed over the entire measured pressure range.
Publisher
International Union of Crystallography (IUCr)
Subject
Materials Chemistry,Metals and Alloys,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Reference29 articles.
1. The Cambridge Structural Database: a quarter of a million crystal structures and rising
2. Anthony, J. W., Bideaux, R. A., Bladh, K. W. & Nichols, M. C. (2001). Handbook of Mineralogy. Chantilly, USA: Mineralogical Society of America.
3. Structure and molecular magnetism of the rutile-related compounds M(dca)2, M = CoII, NiII, CuII, dca = dicyanamide, N(CN)2−
4. Reversible pressure-induced amorphization of a zeolitic imidazolate framework (ZIF-4)
5. Giant negative linear compressibility in zinc dicyanoaurate
Cited by
16 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献