An AEM study of glass-palagonite interfaces formed in Hawaiian basalt glasses
Conference
·
OSTI ID:495701
Basalt glass has been used as a natural analogue of high-level waste glass because both types of glass have similar Si contents. Most important for identifying the dominant long-term corrosion process is the exact chemical nature of the glass-palagonite boundary. In this paper, the authors present the results of a detailed study of alteration interfaces formed in subaerially altered Hawaiian basalt glasses (400 to 700 years old) and analyzed with high resolution transmission electron microscopy (TEM) and nanometer-size energy dispersive x-ray spectrometric (EDS) probe. The study reveals a sharp contact between fresh glass and alteration products at nanometer scale. The alteration products, which were typically several nanometers in size, were found to be iron oxide hydroxide (goethite), aluminum hydroxide hydrate (scarbroite), and an Si-Fe-Al rich amorphous phase. The EDS line profile across the boundary showed a zone of 60--130 nm thickness that is depleted in alkali elements but exhibits no variation for silicon. These results point to a dominant dissolution-precipitation mechanism plus a limited ion-exchange process under subaerial conditions.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE Office of Environmental Restoration and Waste Management, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 495701
- Report Number(s):
- ANL/CMT/CP--91771; CONF-970568--3; ON: DE97053127
- Country of Publication:
- United States
- Language:
- English
Similar Records
Examination of subaerially altered basaltic glass with TEM and EELS
Experimental alteration of basalt glass applied to the alteration of nuclear waste glass
A textural and chemical study of Icelandic palagonite of varied composition and its bearing on the mechanism of the glass-palagonite transformation
Conference
·
Wed Jun 17 00:00:00 EDT 1998
·
OSTI ID:10542
Experimental alteration of basalt glass applied to the alteration of nuclear waste glass
Conference
·
Tue Dec 31 23:00:00 EST 1985
·
OSTI ID:5758276
A textural and chemical study of Icelandic palagonite of varied composition and its bearing on the mechanism of the glass-palagonite transformation
Journal Article
·
Thu Feb 28 23:00:00 EST 1991
· Geochimica et Cosmochimica Acta; (United States)
·
OSTI ID:5890743