I want to define a new buffer, for example, FMQ (fayalite-magnetite-quartz) with the equilibria of 3Fe2SiO4 + O2 = 2Fe3O4 + 3SiO2. Following the tutorial of User's Guide, it seems like that the following input should be inserted into the database:
FMQ-BUFFER O(2) FMQ *FMQ ST 0.000 000000.000 000.000000 0.000000 CP1 0.000000 0.00000 0.00 0.0 COM MAGNETITEQUARTZFAYALITE[-3] 0 MAGNETITE?But I am not sure which phase should be excluded?
More generally, a buffer may be described as ΔFMQ-1 or ΔFMQ+1. In this case, what should I input in the database?
Everybody is welcomed to share your experience and skill. Thanks a lot.