About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Thermodynamics of Materials in Extreme Environments
|
| Presentation Title |
Larnite Ca2SiO4: high-temperature mass spectrometric study of thermodynamic properties |
| Author(s) |
Sergey I. Shornikov |
| On-Site Speaker (Planned) |
Sergey I. Shornikov |
| Abstract Scope |
Lanite (Ca2SiO4) is one of the most important components of silicate slags and cement clinkers. The larnite evaporation was studied by the Knudsen effusion mass spectrometric method at 1762-2288 K. The vapor species typical of simple oxides and the CaSiO3 gaseous oxide have been identified in the gas phase over larnite. The partial pressures of vapor species over larnite have been determined for the first time. The calculated oxide activities were used to determine the mixing energy in larite, as well as the enthalpy and entropy of its formation. The estimation of the enthalpy and entropy of the Ca3Si2O7 (rankinite) formation based on the obtained thermodynamic data corresponds to the available values in the temperature range 1600-1737 K. |