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Title: Extended electron energy loss fine structure simulation of the local boron environment in sodium aluminoborosilicate glasses containing gadolinium

Abstract

Phase separation in sodium-aluminoborosilicate glasses was systematically studied as a function of Gd2O3 concentration with transmission electron microscopy (TEM), energy dispersive x-ray spectroscopy (EDS), and electron energy loss spectroscopy (EELS) methods. Gadolinium-induced phase separation in the three systems can be consistently explained by proposing that Gd cations partition to the borate-rich environments and subsequent agglomeration of the Gd-borate moieties, or short-range ordered structural groups, in the glass. Agglomeration of the Gd-borate rich environments is further discussed within the context of excess metal oxides,[Na2O]ex or[Al2O3]ex=|Na2O - Al2O3|, and excess B2O3,[B2O3]ex, available for incorporating Gd cations. Results showed that agglomeration of the Gd-borate rich environments occurred at a much lower Gd2O3 concentration in the glass without[Na2O]ex or[Al2O3]ex and at a significantly higher Gd2O3 concentration in the glass with either[Na2O]ex or[Al2O3]ex. Assuming 1BO4 : 1Gd : 2BO3 (based on literature-reported Gd-metaborate structure) as a local Gd-borate environment in glass, we introduced the saturation index of boron, SI[B]= Gd2O3/(1/3[B2O3]ex), to examine the glass susceptibility to Gd-induced phase separation for all three alkali-aluminoborosilicate systems. While our results have provided some insight to the glass structure, they also provide insight to the mechanism by which the metal oxide is dissolved into the melt. This appears tomore » occur predominantly through boron complexation of the metal oxide.« less

Authors:
 [1];  [2];  [3];  [3]
  1. Charles Evans and Associates
  2. PPG Industries, Inc
  3. BATTELLE (PACIFIC NW LAB)
Publication Date:
Research Org.:
Pacific Northwest National Lab., Richland, WA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
15006073
Report Number(s):
PNNL-SA-39656
820101000; TRN: US200405%%28
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Non-crystalline Solids
Additional Journal Information:
Journal Volume: 328; Journal Issue: 1-3; Other Information: PBD: 1 Dec 2003
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AGGLOMERATION; GADOLINIUM OXIDES; BOROSILICATE GLASS; SODIUM OXIDES; ALUMINIUM OXIDES; PHASE STUDIES; BORON OXIDES; MORPHOLOGY; GADOLINIUM, PARTITION, PHASE SEPARATION, BOROSILICATES

Citation Formats

Qian, Morris, Li, Hong, Li, Liyu, and Strachan, Denis M. Extended electron energy loss fine structure simulation of the local boron environment in sodium aluminoborosilicate glasses containing gadolinium. United States: N. p., 2003. Web. doi:10.1016/S0022-3093(03)00477-0.
Qian, Morris, Li, Hong, Li, Liyu, & Strachan, Denis M. Extended electron energy loss fine structure simulation of the local boron environment in sodium aluminoborosilicate glasses containing gadolinium. United States. https://doi.org/10.1016/S0022-3093(03)00477-0
Qian, Morris, Li, Hong, Li, Liyu, and Strachan, Denis M. 2003. "Extended electron energy loss fine structure simulation of the local boron environment in sodium aluminoborosilicate glasses containing gadolinium". United States. https://doi.org/10.1016/S0022-3093(03)00477-0.
@article{osti_15006073,
title = {Extended electron energy loss fine structure simulation of the local boron environment in sodium aluminoborosilicate glasses containing gadolinium},
author = {Qian, Morris and Li, Hong and Li, Liyu and Strachan, Denis M},
abstractNote = {Phase separation in sodium-aluminoborosilicate glasses was systematically studied as a function of Gd2O3 concentration with transmission electron microscopy (TEM), energy dispersive x-ray spectroscopy (EDS), and electron energy loss spectroscopy (EELS) methods. Gadolinium-induced phase separation in the three systems can be consistently explained by proposing that Gd cations partition to the borate-rich environments and subsequent agglomeration of the Gd-borate moieties, or short-range ordered structural groups, in the glass. Agglomeration of the Gd-borate rich environments is further discussed within the context of excess metal oxides,[Na2O]ex or[Al2O3]ex=|Na2O - Al2O3|, and excess B2O3,[B2O3]ex, available for incorporating Gd cations. Results showed that agglomeration of the Gd-borate rich environments occurred at a much lower Gd2O3 concentration in the glass without[Na2O]ex or[Al2O3]ex and at a significantly higher Gd2O3 concentration in the glass with either[Na2O]ex or[Al2O3]ex. Assuming 1BO4 : 1Gd : 2BO3 (based on literature-reported Gd-metaborate structure) as a local Gd-borate environment in glass, we introduced the saturation index of boron, SI[B]= Gd2O3/(1/3[B2O3]ex), to examine the glass susceptibility to Gd-induced phase separation for all three alkali-aluminoborosilicate systems. While our results have provided some insight to the glass structure, they also provide insight to the mechanism by which the metal oxide is dissolved into the melt. This appears to occur predominantly through boron complexation of the metal oxide.},
doi = {10.1016/S0022-3093(03)00477-0},
url = {https://www.osti.gov/biblio/15006073}, journal = {Journal of Non-crystalline Solids},
number = 1-3,
volume = 328,
place = {United States},
year = {Mon Dec 01 00:00:00 EST 2003},
month = {Mon Dec 01 00:00:00 EST 2003}
}