Electrochemical Studies in Glass: I, The System NiO-Na2Si2O5 |
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Authors: | ALTON M. LACY JOSEPH A. PASK |
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Affiliation: | Inorganic Materials Research Division, Lawrence Radiation Laboratory, and Department of Materials Science and Engineering, College of Engineering, University of California, Berkeley, California 94720 |
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Abstract: | A solid electrolyte electrochemical cell of the type Pt|Ni:NiO a =1∥ZrO2+7.5% CaO∥Ni:NiO a <1+glass|Pt was used to measure the activities of NiO in sodium disilicate glass from 750° to 1100°C. The data indicate a solubility varying from 11 mol% (5.0 wt%) at 800° to 20 mol% (9.3 wt%) at 1100°C. From the variation in NiO activity, the activity of sodium disilicate in glass solution was estimated; from these combined data partial molar free energies and entropies of solution of NiO and Na2Si2O5 and free energies and entropies of mixing were calculated. A partial phase diagram for the system NiO-Na2Si2O5 proposed from solubility data indicates a eutectic at ∼12 mol% (5.3 wt%) NiO at 830°C. |
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