Single crystal Raman spectrum of uvarovite, Ca3Cr2Si3O12 |
| |
| Authors: | Anastasia Chopelas |
| |
| Institution: | (1) Department of Physics, University of Washington, Seattle, WA, 98195-1560, |
| |
| Abstract: | Single-crystal Raman spectra of synthetic end-member uvarovite (Ca3Cr2Si3O12) and of a binary solution (59% uvarovite, 41% andradite) have been measured using single crystal techniques. For each of
these garnets, 22 and 21 of the 25 Raman modes were located, respectively. The spectra for uvarovite garnets closely resemble
those of the other calcic garnets, grossular, and andradite. The modes for uvarovites do not fit into the same trends as established
by the other five anhydrous end-member garnets: the high energy “internal” Si–O modes do not depend on lattice constant in
uvarovite. They exceed frequencies for both andradite and grossular. This is likely due to the large crystal field stabilization
energy of trivalent chromium. The low energy and midrange modes are at similar frequencies to the other calcic garnets. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
