Year: 1985
Type: article
Abstract: Solid-state reactions in the 2FeO–SiO2 and 2NiO–SiO2 systems were studied using X-ray diffraction, and discussion on kinetics was made comparing the reaction of 2FeO+SiO2→Fe2SiO4 with 2NiO+SiO2→Ni2SiO4.A sample of mixed powder of 2FeO+SiO2 was heated and kept at 1173–1323 K for specified times up to 36 ks, and its reaction ratio was determined using the internal standard method of X-ray diffraction. As a result, the solid-state reaction in the 2FeO–SiO2 system was found to conform to Carter’s equation of diffusion-controlled reaction, and the apparent activation energy of the reaction was about 172 kJ/mol.A sample of mixed powder of 2NiO+SiO2 was subjected to solid-state reaction by heating and keeping at 1573–1673 K for specified times up to 100 ks. The reaction ratio of the 2NiO–SiO2 system was found to be much lower than that of the 2FeO–SiO2 system and not to conform to any equation of diffusion-controlled reaction. The results of analysis indicated that the solid-state reaction in the 2NiO–SiO2 system was an interface-controlled reaction, and that its apparent activation energy was about 246 kJ/mol.
Institution: Kumamoto University
Language: English
Topic: Thermal and Kinetic Analysis
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1783055201