Cathodoluminescence of meteoritic and synthetic forsterite at 296 and 77 K using TEM

Other| April 01, 1997 Cathodoluminescence of meteoritic and synthetic forsterite at 296 and 77 K using TEM E. J. Benstock; E. J. Benstock Arizona State University, Department of Geology, Tempe, AZ, United States Search for other works by this author on: GSW Google Scholar Peter R. Buseck; Peter R. Buseck Search for other works by this author on: GSW Google Scholar Ian M. Steele Ian M. Steele Search for other works by this author on: GSW Google Scholar American Mineralogist (1997) 82 (3-4): 310–315. https://doi.org/10.2138/am-1997-3-409 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation E. J. Benstock, Peter R. Buseck, Ian M. Steele; Cathodoluminescence of meteoritic and synthetic forsterite at 296 and 77 K using TEM. American Mineralogist 1997;; 82 (3-4): 310–315. doi: https://doi.org/10.2138/am-1997-3-409 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search nav search search input Search input auto suggest search filter All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract Cathodoluminescence (CL) emission spectra of forsterite from the Allende (CV3) and Murchison (C2) meteorites and from Cr-doped and pure synthetic forsterite samples have been obtained at room (296 K) and liquid nitrogen (77 K) temperatures using a transmission electron microscope. At room temperature, three broad CL emissions centered near 420, 640, and 800 nm occur in the meteoritic forsterite, and one peak at 800 nm occurs in one Cr3+-doped forsterite sample. Only the 420 nm peak is present in pure synthetic forsterite. Relative to room temperature, at liquid-nitrogen temperature there is a general increase in overall CL intensity, whereas a broad peak located between 700 and 800 nm changes to a series of sharp emissions centered near 700 nm and a narrower but still broad peak centered near 800 nm.The portion of the broad peak near 700 nm at room temperature and equivalent sharp peaks at low temperature are assigned to Cr3+ in octahedral coordination, whereas the broad peak near 800 nm is attributed to Cr associated with structural defects. The peak at 640 nm is consistent with a similar peak in Mn2+-doped forsterite. The peak at 420 nm results from an unknown structural effect that can be eliminated in synthetic forsterite by mechanical deformation. The variation of relative intensities at room temperature for the two broad peaks at 700 and 800 nm in meteoritic forsterite can be correlated with meteorite type and may reflect different processes in forsterite formation or subsequent processing. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.