Structural evolution of calcite at high temperatures: Phase V unveiled

The calcite form of calcium carbonate CaCO(3) undergoes a reversible phase transition between R[Image: see text]c and R[Image: see text]m at ~1240 K under a CO(2) atmosphere of ~0.4 MPa. The joint probability density function obtained from the single-crystal X-ray diffraction data revealed that the...

Descripción completa

Detalles Bibliográficos
Autores principales: Ishizawa, Nobuo, Setoguchi, Hayato, Yanagisawa, Kazumichi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2013
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3788374/
https://www.ncbi.nlm.nih.gov/pubmed/24084871
http://dx.doi.org/10.1038/srep02832
Descripción
Sumario:The calcite form of calcium carbonate CaCO(3) undergoes a reversible phase transition between R[Image: see text]c and R[Image: see text]m at ~1240 K under a CO(2) atmosphere of ~0.4 MPa. The joint probability density function obtained from the single-crystal X-ray diffraction data revealed that the oxygen triangles of the CO(3) group in the high temperature form (Phase V) do not sit still at specified positions in the space group R[Image: see text]m, but migrate along the undulated circular orbital about carbon. The present study also shows how the room temperature form (Phase I) develops into Phase V through an intermediate form (Phase IV) in the temperature range between ~985 K and ~1240 K.

Ejemplares similares