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Title: Liquidus temperature in the spinel primary phase field: A comparison between optical and crystal fraction methods

Journal Article · · Journal of Non-Crystalline Solids
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
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Liquidus temperature (TL) was measured for 38 simulated high-level waste borosilicate glasses covering a Hanford composition region, using optical microscopy and crystal-fraction extrapolation methods to analyze isothermally heat-treated specimens. Furthermore, the glasses encompassed a one-component-at-a-time variation of 16 components from a representative Hanford HLW simulant baseline composition. The TL values ranged from 1006 °C to 1603 °C. First-order models were fit to data to obtain component effects on TL (per 1 mass% additions) and then the components were grouped into three categories: TL-increasing components [i.e., Cr2O3 (264 °C), “Others” (minor components, 163 °C), oxides of noble metals (137 °C), NiO (91 °C), as well as Al2O3 and Fe2O3 (~ 19–21 °C)]; TL-decreasing components [i.e., K2O (-26 °C), Na2O (-41 °C), and Li2O (-68 °C)]; and those of little effect [i.e., MnO, P2O5, ZrO2, F, Bi2O3, SiO2, B2O3, and CaO (9 to -12 °C)]. We also present the temperatures at which 1 vol% of spinel is at equilibrium with the melt (T1%) as these values are considered relevant to the Hanford Tank Waste Treatment and Immobilization Plant. The measured and estimated values are compared and contrasted and the effect of TL and T1% on glass formulation is discussed. The different methods for measuring TL are compared and contrasted.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Environmental Management (EM)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1416963
Alternate ID(s):
OSTI ID: 1691916
Report Number(s):
PNNL-SA-128799; PII: S0022309317306373; TRN: US1800978
Journal Information:
Journal of Non-Crystalline Solids, Vol. 483; ISSN 0022-3093
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

Figures / Tables (15)

Table 1(p. 2)table Table 1
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Figure 3(p. 4)figure Figure 3
Figure 4(p. 5)figure Figure 4
Figure 5(p. 5)figure Figure 5
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Figure 7(p. 6)figure Figure 7
i values of "NM" and "Others" components." data-ostiid="1416963">
Table 4(p. 6)table Table 4
Figure 8(p. 7)figure Figure 8
Table 5(p. 7)table Table 5
Table 6(p. 7)table Table 6
Figure 9(p. 8)figure Figure 9

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
liquidus temperature
crystal fraction
spinel
high-level waste