Pressure Effect on the Crystal Structure of Na2C2O4: Deformation Anisotropy During Hydrostatic Compression and Phase Transition at 3.8 GPa

Authors: Boldyreva E.V.¹; Shakhtshneider T.P.¹; Ahsbahs H.²; Uchtmann H.²

Source: Journal of Structural Chemistry, Volume 43, Number 1, January 2002 , pp. 101-107(7)

Publisher: Springer

Buy & download fulltext article:

Price: $47.00 plus tax (Refund Policy)

Abstract:

Variation of the unit cell parameters of Na_2C_2O_4 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.

Language: English

Document Type: Regular paper

Affiliations: 1: Novosibirsk State University. Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences shah@solid.nsk.ru 2: Institute of Mineralogy and Materials Science Center, Marburg University, Germany

Publication date: 2002-01-01