Kinetic and microstructural studies of the crystallisation of coesite from quartz at high pressure
Abstract
The kinetics of the α-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 Synchrotronstrah-lungslabor (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 α-quartz-coesite phase transition is illustrated.
© 2015 Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, 81671 München
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Articles in the same Issue
- A Monte Carlo method for indexing
- Kinetic and microstructural studies of the crystallisation of coesite from quartz at high pressure
- Studies on peroxomolybdates XXI. Crystal structure of the ammonium peroxooctamolybdate(VI) (NH4)4[Mo8O24+x(O2)2−x(H2O)2] · 4H2O (x = 0.8)1
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- A neutron powder investigation of the high-temperature structure and phase transition in stoichiometric LiNbO3
- Syntheses and crystal structures of Co3(C2O4)(SeO3)2 and Zn(C2O4) · 2H2O
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- Crystal structures of four Cs3MI5 (M = Mn, Cd, Hg) phases and structural relationship among Cs3MI5 compounds
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