| Autor: | H. Ahsbahs, Hermann Uchtmann, T. P. Shakhtshneider, Elena V. Boldyreva |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Phase transition
Materials science Condensed matter physics Hydrostatic pressure Diamond Crystal structure engineering.material Compression (physics) law.invention Inorganic Chemistry Condensed Matter::Materials Science Crystallography law Materials Chemistry engineering Physical and Theoretical Chemistry Deformation (engineering) Hydrostatic equilibrium Anisotropy |
| Zdroj: | Journal of Structural Chemistry. 43:101-107 |
| ISSN: | 0022-4766 |
| DOI: | 10.1023/a:1016030001460 |
| Popis: | Variation of the unit cell parameters of Na2C2O4 is investigated by powder diffractometry in diamond anvils when hydrostatic pressure is increased to 6.5 GPa. Anisotropic distortion of the structure was observed up to about 3.8 GPa, whereupon a transition to an unknown polymorphous modification occurred. Before the phase transition, the compression was maximal in the direction perpendicular to close-packed layers formed by oxalate ions. Minimal compression was observed in the direction of the specific crystallographic axis b. The anisotropy of compression at elevated pressure is similar, but not identical, to the anisotropy of compression of the same structure at reduced temperature. |
| Databáze: | OpenAIRE |
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