期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 31, 期 8, 页码 1473-1480出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2011.02.023
关键词
Nitrides; Decomposition; MgSiN2; Enthalpy
资金
- JSPS Japan
- Slovak Grant Agencies [VEGA 2/0178/10, APVV-0517-07, LPP-0394/09]
Magnesium silicon nitride MgSiN2 was prepared by direct nitridation of Si/Mg2Si/Mg/Si3N4 powder compact in a temperature range 1350-1420 degrees C. The thermal stability examination showed that MgSiN2 is stable up to 1400 degrees C at 0.1 MPa N-2 pressure. The activation energy of decomposition of MgSiN2 calculated from the temperature dependence of mass loss in the range of 1400-1650 degrees C is Delta H = 501 kJ mol(-1). The time dependence and nitrogen pressure dependence of MgSiN2 decomposition was also investigated at constant temperature. MgSiN2 is stable at 1560 degrees C in 0.6 MPa nitrogen atmosphere. Using these experimental data together with the heat capacity published in a literature the Gibbs energy of formation of MgSiN2 was calculated in a temperature range 25-2200 degrees C. (C) 2011 Elsevier Ltd. All rights reserved.
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