About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Phase Transformations in Ceramics: Science and Applications
|
| Presentation Title |
In-Situ, in Air, High Temperature, Crystallographic, Synchrotron Studies of Ceramics |
| Author(s) |
Waltraud M. Kriven |
| On-Site Speaker (Planned) |
Waltraud M. Kriven |
| Abstract Scope |
The use of a four lamp, quadrupole furnace has enabled temperatures of 2050 °C (the melting point of alumina) to be reached with an accuracy of ±4°C to 1800°C and ±10°C to 2,000°C. A conical nozzle levitator of a rotating liquid or polycrystalline bead can be heated by a laser to 3200°C with an accuracy of ±100°C. Heating, in situ, in air gives accurate values of crystallographic properties which differ from those measured under vacuum as is necessitated by a graphite or metallic heater. The types of in situ measurements made include (i) Crystallographic thermal expansions in 3-D (Program CTEAS) (ii) Crystallographic mechanisms of phase transformations (iii) Kinetics and mechanisms of solid state chemical reactions (iv) flash sintering (iv) in situ determination of phase diagrams to 3,200°C. Polycrystalline XRD and pair distribution function (PDF) powder diffraction patterns were taken and analyzed by Rietveld analysis using GSAS, TOPAS or FULLPROF software. |