Figure 1From: The effects of instrument parameters and sample properties on thermal decomposition: interpreting thermal analysis data from Mars Thermal analysis of an aluminum standard and Iceland spar calcite. A) Heat flow vs. temperature data for the melting of an aluminum sample used to calibrate thermocouples. The endotherm for a pure metal has a very well defined onset temperature and a clear baseline on either side of the endotherm. In contrast, the decomposition of CaCO3 (B) has a much broader endotherm with a more ambiguous baseline (note the difference in scale on the x-axis). This results in a more subjective onset temperature as the baseline must be manually defined. Peak temperatures are also identified. Both samples were run at 30 mbar using a He carrier gas with a 3 sccm flow rate and a ramp rate of 35°C/minute.Back to article page