| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Thermodynamics of Materials in Extreme Environments
|
| Presentation Title |
Heat Capacity of Microgram Oxide Samples by Fast Scanning Calorimetry |
| Author(s) |
Alexandra Navrotsky, Laura Bonatti, Ben Brugman, Tamilarasan Subramani, Kurt Leinenweber |
| On-Site Speaker (Planned) |
Alexandra Navrotsky |
| Abstract Scope |
Quantitative scanning calorimetry on microgram sized samples opens a broad new range of opportunities for studying the thermodynamic properties of quantity-limited materials, including those produced under extreme conditions or found as rare accessory minerals in nature. We calibrated the Mettler Toledo Flash DSC 2+ calorimeter to obtain quantitative heat capacities in the range 200 - 350 oC, using samples weighing between 2 and 11.5 micrograms. Our technique has been applied to a new set of oxide materials to which it has never been used before, without the need for melting, glass transitions or phase transformations. Heat capacity data were obtained for silica in the high pressure stishovite (rutile) structure, dense post-stishovite glass, standard fused quartz, and for TiO2 rutile. After accurate calibrations, measured heat capacities were then used to calculate masses for samples in the microgram and sub-microgram range, a substantial improvement over measurement in conventional microbalances |