Direct structural characterization of the changes in the local environment of Mg occurring in the garnet structure as a function of the Ca content are determined by Mg K-edge X-ray absorption fine structure on synthetic samples along the pyrope-grossular join. With increasing Ca content, the short Mg-O2 distance of the dodecahedron slightly decreases, while the long Mg-O4 distance tends to increase, so that the dodecahedron is more distorted in grossular-rich garnets than in end-member pyrope. This quantitative direct description of the changes in the local environment of Mg in the pyrope-grossular solid solution confirms and better defines previous experimental and recent computational results.
Quartieri S, Boscherini F, Dalconi MC, Iezzi G, Meneghini C, & Oberti R (2008). Magnesium K-edge EXAFS study of bond-length behavior in synthetic pyrope-grossular garnet solid solutions. AMERICAN MINERALOGIST, 93, 495.
Titolo: | Magnesium K-edge EXAFS study of bond-length behavior in synthetic pyrope-grossular garnet solid solutions |
Autori: | |
Data di pubblicazione: | 2008 |
Rivista: | |
Citazione: | Quartieri S, Boscherini F, Dalconi MC, Iezzi G, Meneghini C, & Oberti R (2008). Magnesium K-edge EXAFS study of bond-length behavior in synthetic pyrope-grossular garnet solid solutions. AMERICAN MINERALOGIST, 93, 495. |
Abstract: | Direct structural characterization of the changes in the local environment of Mg occurring in the garnet structure as a function of the Ca content are determined by Mg K-edge X-ray absorption fine structure on synthetic samples along the pyrope-grossular join. With increasing Ca content, the short Mg-O2 distance of the dodecahedron slightly decreases, while the long Mg-O4 distance tends to increase, so that the dodecahedron is more distorted in grossular-rich garnets than in end-member pyrope. This quantitative direct description of the changes in the local environment of Mg in the pyrope-grossular solid solution confirms and better defines previous experimental and recent computational results. |
Handle: | http://hdl.handle.net/11590/140672 |
Appare nelle tipologie: | 1.1 Articolo in rivista |