INVESTIGADORES
ECHEVERRIA Gustavo Alberto
artículos
Título:
Crystal and molecular structure and spectroscopic behavior of isotypic synthetic analogues of the oxalate minerals stepanovite and zhemchuzhnikovite
Autor/es:
OSCAR E. PIRO; GUSTAVO A. ECHEVERRÍA; ANA C. GONZÁLEZ-BARÓ; ENRIQUE J. BARAN
Revista:
PHYSICS AND CHEMISTRY OF MINERALS
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2016 vol. 43 p. 287 - 300
ISSN:
0342-1791
Resumen:
The crystal structure of syntheticstepanovite, Na[Mg(H2O)6][Fe(C2O4)3].3H2O,and zhemchuzhnikovite, Na[Mg(H2O)6][AlxFe1-x(C2O4)3].3H2O,minerals have been determined by single crystal X-ray diffraction methods. The compounds are isomorphic to each other and to the previouslyreported Na[Mg(H2O)6][M(C2O4)3].3H2O(M: Cr, Al) isomorphic pair. They crystallize in the trigonal P3c1space group with Z=6 molecules perunit cell and (hexagonal axes) a=b=17.0483(4), c=12.4218(4) Å for the iron crystal, and a=b=16.8852(5),c=12.5368(5) Å for the aluminum and iron solid solution. Comparison of ourcrystallographic results with early X-ray diffraction and chemical data of stepanoviteand zhemchuzhnikovite minerals provides compelling evidence that these naturalmaterials basically possess the same crystal and molecular structure as theirsynthetic counterparts. Besides, the infrared and Raman spectra of bothsynthetic minerals were also recorded and briefly discussed.
