Pressure Effect on the Crystal Structure of Na2C2O4: Deformation Anisotropy During Hydrostatic Compression and Phase Transition at 3.8 GPa |
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| Authors: | E. V. Boldyreva T. P. Shakhtshneider H. Ahsbahs H. Uchtmann |
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| Affiliation: | (1) Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk State University, Russia;(2) Institute of Mineralogy and Materials Science Center, Marburg University, Germany |
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| Abstract: | 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. |
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