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Título:
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The morphology of calcite crystals grown in a porous mediumdoped with divalent cations
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Autores:
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Fernández-Díaz, Lourdes ;
Astilleros García-Monge, José Manuel ;
Pina Martínez, Carlos Manuel
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Tipo de documento:
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texto impreso
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Editorial:
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Elsevier Science B.V., Amsterdam., 2006
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Geología: Cristalografía
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Tipo = Artículo
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Resumen:
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Calcite crystals were grown in the presence of small concentrations (50, 200, and 600 ppm) of divalent cations (Ba2+, Sr2+, Co2+ and Mn2+) in a silica hydrogel medium. The calcite crystals grown in the presence of cations larger than Ca2+ (Ba2+ or Sr2+) developed rhombohedral habits defined by {101¯4} form, similar to the morphology of calcite grown in a pure gel. SEM images show that growth on {101¯4} occurs by lateral advancement of layers founded by macroscopic dendritic or jagged steps. In the case of calcite crystals grown in a gel doped with cations smaller than Ca2+ (Co2+ or Mn2+), a variety of morphologies was obtained, ranging from blocky crystals (at lower concentrations: 50 and 200 ppm) to peanut-like aggregates, spheres and spherulites (at 600 ppm). The macroscopic morphological characteristics of such doped calcite crystals reflect closely the growth behaviour of calcite {101¯4} surface at a nanoscale, reported by previous AFM studies. Morphological features have been interpreted on the basis of the modification of growing steps characteristics as a consequence of asymmetrical cation incorporation. The use of such morphologies as a criterion of biological activity is, therefore, unreliable.
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En línea:
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https://eprints.ucm.es/id/eprint/14545/1/The_morphology_of_calcite_crystals_grown_in_a_porous_medium_doped_with_divalent_cations_Fernndez_Diaz_et_al_2006_1.jpg.pdf
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