Artículo
Optical-active phonons in A3Fe2B″O9 (A=Ca, Sr; B″ =Te, W) double perovskites
Silva, E. N.; Guedes, I.; Ayala, A. P.; López, C. A.; Augsburger, Marta Susana; Viola, Maria del Carmen; Pedregosa, Jose Carmelo
Fecha de publicación:
02/2010
Editorial:
American Institute of Physics
Revista:
Journal of Applied Physics
ISSN:
0021-8979
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Raman scattering and infrared transmittance techniques are used to investigate the phonons of the Sr3Fe2TeO 9(SFTO), Sr3Fe2WO9(SFWO), and Ca3Fe2WO9(CFWO) double perovskites at 300 K. While SFTO and SFWO crystallize in a tetragonal structure belonging to the I4/m space with two formulas per unit cell (Z=2), CFWO crystallizes in a monoclinic structure belonging to the space group P 21/n with Z=2. The observed spectra are very similar to that of the prototype cubic (Fm̄3m) double perovskite, indicating that both the tetragonal and monoclinic structures result from small distortions of the cubic cell. The assignment of the optical phonons follows that given for the prototype Fm̄3m double perovskites. © 2010 American Institute of Physics.
Palabras clave:
CALCIUM COMPOUNDS
,
CRYSTAL STRUCTURE
,
INFRARED SPECTRA
,
IRON COMPOUNDS
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Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción:
Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
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Colecciones
Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Citación
Silva, E. N.; Guedes, I.; Ayala, A. P.; López, C. A.; Augsburger, Marta Susana; et al.; Optical-active phonons in A3Fe2B″O9 (A=Ca, Sr; B″ =Te, W) double perovskites; American Institute of Physics; Journal of Applied Physics; 107; 4; 2-2010; 1-5
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