Journalartikel

Jahr der Veröffentlichung: 1997

Seiten: 691-698

Zeitschrift: Zeitschrift für Kristallographie

Bandnummer: 212

Heftnummer: 10

ISSN: 0044-2968

DOI Link: https://doi.org/10.1524/zkri.1997.212.10.691

Verlag: Oldenbourg Verlag

Abstract: 

The kinetics of the alpha-quartz to coesite transition have been studied in the pressure range of 3.2 GPa to 5.2 GPa and in the temperature range 950 K-1175 K by in situ X-ray diffraction using a MAX80 cubic anvil high pressure apparatus at the Hamburger Synchrotronstrahlungslabor (HASYLAB). During the phase transition, X-ray diffraction patterns were collected at intervals of 60 s. The transformed volume fraction has been calculated from the diffracted intensities of the respective phases as a function of time. By fitting a fundamental rate equation for grain boundary nucleation and interface-controlled growth to the transformation-time data, rates of nucleation and growth have been calculated. A discrepancy between the experimental determined and theoretical calculated phase boundary is discussed.

After quenching the samples, the reaction products could be investigated by TEM images. A specific feature of the synthesised coesite crystals was a concentrated microtwinning. Its influence on the crystal structure and thus on the thermodynamic behaviour of the alpha-quartz-coesite phase transition is illustrated.

Harvard-Zitierstil: Zinn, P., Lauterjung, J., Wirth, R. and Hinze, E. (1997) Kinetic and microstructural studies of the crystallisation of coesite from quartz at high pressure, Zeitschrift für Kristallographie, 212(10), pp. 691-698. https://doi.org/10.1524/zkri.1997.212.10.691

APA-Zitierstil: Zinn, P., Lauterjung, J., Wirth, R., & Hinze, E. (1997). Kinetic and microstructural studies of the crystallisation of coesite from quartz at high pressure. Zeitschrift für Kristallographie. 212(10), 691-698. https://doi.org/10.1524/zkri.1997.212.10.691