Table 7: Crystalline phases identified in investigated samples.

SampleSintering temperatureFreshUsed (cooled in 5% )

5.6% MgO1200°C , MgOCaMnO2.98, CaMn2O4, MgO
1300°C , MgOCaMnO2.95, MgO

2.7% MgO1200°C ,  MgOCaMnO2.95, MgO
1300°C , MgOCaMnO2.95, MgO