We are conducting deformation experiments on Quartz using the D-DIA apparatus. The following is an example of the data we collect.

qzxrdpattern
Portion of an x-ray diffraction pattern showing the quartz (100) peak in the compression and transverse detectors. The differential lattice strain (ehkl) is calculated from the difference in peak positions between the two sets of detectors.

Below are lattice spacings for the quartz (100), (101), and (112) reflections as a function of time during the deformation experiment. The calculated “hydrostatic” d-spacing is shown as a dashed line. The position of each reflection is measured as a function of time during the deformation experiment. D-spacings for the vertical pair of detectors (1 & 2) shrink more than for the horizontal pair (3 & 4), reflecting increasing differential stress.

100dspacingvstime
Lattice spacings for the quartz (100) reflection.
101dspacingvstime
Lattice spacing for the quartz (101) reflection.
112dspacingvstime
Lattice spacing for the quartz (112) reflection.

We use Elastic-Plastic Self-Consistent (EPSC) Models to interpret our diffraction data. EPSC Models assume that ductile deformation is controlled by the motion of dislocations and/or by twinning.

useepscmodeling

We were able to simulate our diffraction data collected at 800°C with an EPSC Model that used only basal and prismatic slip. This is consistent with the slip systems that are thought to operate at this temperature.

EPSC results

For out most recent poster on quartz deformation, click here.

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