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Synopsis: The standard free energies of formation of Fe2SiO4, Co2SiO4 and Ni2SiO4 were measured in the temperature range from 675•‹ to 1000 •Ž by a galvanic cell method, using 0.85ZrO2. 0.15CaO as electrolyte. The formation reactions are 2FeO (s)+ SiO2 (s)= Fe2SiO4 (s), 2CoO (s)+ SiO2 (s)=Co2SiO4(s), and 2NiO (s)+ SiO2 (s)= Ni2SiO4 (s) foI which △G° Fe2SiO4= -10500± 80+ (4.853± 0.074) T cal/mol, △G° Co2SiO4= -7270± 40+ (3.062± 0.040) T cal/mol, △G° Ni2SiO4= -5270± 100+ (2.927± 0.093) T cal/mol The accuracy of these measurements was discussed together with the thermochemical data of other investigators. (Received July 7, 1974)

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The Electrochemical Measurement of Standard Free Energies of Formation for Fe&lt;SUB&gt;2&lt;/SUB&gt;SiO&lt;SUB&gt;4&lt;/SUB&gt;, Co&lt;SUB&gt;2&lt;/SUB&gt;SiO&lt;SUB&gt;4&lt;/SUB&gt; and Ni&lt;SUB&gt;2&lt;/SUB&gt;SiO&lt;SUB&gt;4&lt;/SUB&gt;