Abstract
The `in situ' thermal behaviour of muscovite-2M1 in the range 25-1300 °C has been studied by high temperature X-ray powder diffraction, using both conventional angle-dispersive Bragg-Brentano geometry, and energy-dispersive configuration with synchrotron radiation. The reaction starting at about 850 °C shows a phase transition from muscovite-2M1 to muscovite-1M, which is the precursor of a mullite phase, stable at higher temperatures. The temperature dependence of the lattice parameters is discussed, together with the high temperature structural distortions. The parametrization through the tetrahedra rotation angle indicate a more symmetrical ditrigonal cavity at high temperature. The high temperature diffraction spectra collected in the angle-dispersive mode have been analyzed with the aid of powder profile computer simulation and full-profile multiphase Rietveld refinement.
| Original language | English |
|---|---|
| Pages (from-to) | 547-552 |
| Number of pages | 6 |
| Journal | Materials Science Forum |
| Volume | 166-169 |
| Issue number | pt 2 |
| Publication status | Published - 1994 |
| Externally published | Yes |