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Coherent diffraction imaging of nanoscale strain evolution in a single crystal under high pressure.

Yang W, Huang X, Harder R, Clark JN, Robinson IK, Mao HK - Nat Commun (2013)

Bottom Line: Here we report the successful de-convolution of these effects with the recently developed mutual coherent function method to reveal the three-dimensional strain distribution inside a 400 nm gold single crystal during compression within a diamond-anvil cell.The three-dimensional morphology and evolution of the strain under pressures up to 6.4 GPa were obtained with better than 30 nm spatial resolution.In addition to providing a new approach for high-pressure nanotechnology and rheology studies, we draw fundamental conclusions about the origin of the anomalous compressibility of nanocrystals.

View Article: PubMed Central - PubMed

Affiliation: High Pressure Synergetic Consortium, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA. wyang@ciw.edu

ABSTRACT
The evolution of morphology and internal strain under high pressure fundamentally alters the physical property, structural stability, phase transition and deformation mechanism of materials. Until now, only averaged strain distributions have been studied. Bragg coherent X-ray diffraction imaging is highly sensitive to the internal strain distribution of individual crystals but requires coherent illumination, which can be compromised by the complex high-pressure sample environment. Here we report the successful de-convolution of these effects with the recently developed mutual coherent function method to reveal the three-dimensional strain distribution inside a 400 nm gold single crystal during compression within a diamond-anvil cell. The three-dimensional morphology and evolution of the strain under pressures up to 6.4 GPa were obtained with better than 30 nm spatial resolution. In addition to providing a new approach for high-pressure nanotechnology and rheology studies, we draw fundamental conclusions about the origin of the anomalous compressibility of nanocrystals.

No MeSH data available.


Related in: MedlinePlus

Phase distribution as a function of applied pressure (0.8–6.4 GPa).Two-dimensional views from the top and bottom are shown in a. The quantitative phase shift values at locations 1–3 labelled in Fig. 3 and the deviation over entire crystal are plotted in b and c as a function of pressure. Arrows in a point to the characteristic strain-evolving regions discussed in the text. The phase shift values in b are the averaged values within 3 × 3 × 3 pixel boxes around the centres taken at the selected corner region labelled in Fig. 3, while the maximum and minimum values in the 3 × 3 × 3 boxes are used as the error bar range, respectively.
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f4: Phase distribution as a function of applied pressure (0.8–6.4 GPa).Two-dimensional views from the top and bottom are shown in a. The quantitative phase shift values at locations 1–3 labelled in Fig. 3 and the deviation over entire crystal are plotted in b and c as a function of pressure. Arrows in a point to the characteristic strain-evolving regions discussed in the text. The phase shift values in b are the averaged values within 3 × 3 × 3 pixel boxes around the centres taken at the selected corner region labelled in Fig. 3, while the maximum and minimum values in the 3 × 3 × 3 boxes are used as the error bar range, respectively.

Mentions: The Bragg CXDI measurements were performed at 0.8, 1.7, 2.5, 3.2 and 6.4 GPa on the same crystal. The reconstructed images (both top and bottom views) are shown in Fig. 4a. The dimension of the measured crystal is about 480 × 380 × 180 nm at 0.8 GPa and shrinks a little bit as pressure increases. The noteworthy features in Fig. 4 are the morphology change and strain redistribution as pressure increases. The phase shifts as a function of pressure at the selected three distinguished locations are plotted in Fig. 4b. At each selected corner region, the phase shift values within 3 × 3 × 3 pixel boxes with pixel size 12 nm around the centre were taken, and the averaged values were plotted as a function of pressure in Fig. 4b, where the maximum and minimum values in the 3 × 3 × 3 boxes were used as the error bar range, respectively. The phase shift value is directly connected to the local lattice displacement, thus strain, projected to the measured direction as φ= ·Δ (11).


Coherent diffraction imaging of nanoscale strain evolution in a single crystal under high pressure.

Yang W, Huang X, Harder R, Clark JN, Robinson IK, Mao HK - Nat Commun (2013)

Phase distribution as a function of applied pressure (0.8–6.4 GPa).Two-dimensional views from the top and bottom are shown in a. The quantitative phase shift values at locations 1–3 labelled in Fig. 3 and the deviation over entire crystal are plotted in b and c as a function of pressure. Arrows in a point to the characteristic strain-evolving regions discussed in the text. The phase shift values in b are the averaged values within 3 × 3 × 3 pixel boxes around the centres taken at the selected corner region labelled in Fig. 3, while the maximum and minimum values in the 3 × 3 × 3 boxes are used as the error bar range, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3644065&req=5

f4: Phase distribution as a function of applied pressure (0.8–6.4 GPa).Two-dimensional views from the top and bottom are shown in a. The quantitative phase shift values at locations 1–3 labelled in Fig. 3 and the deviation over entire crystal are plotted in b and c as a function of pressure. Arrows in a point to the characteristic strain-evolving regions discussed in the text. The phase shift values in b are the averaged values within 3 × 3 × 3 pixel boxes around the centres taken at the selected corner region labelled in Fig. 3, while the maximum and minimum values in the 3 × 3 × 3 boxes are used as the error bar range, respectively.
Mentions: The Bragg CXDI measurements were performed at 0.8, 1.7, 2.5, 3.2 and 6.4 GPa on the same crystal. The reconstructed images (both top and bottom views) are shown in Fig. 4a. The dimension of the measured crystal is about 480 × 380 × 180 nm at 0.8 GPa and shrinks a little bit as pressure increases. The noteworthy features in Fig. 4 are the morphology change and strain redistribution as pressure increases. The phase shifts as a function of pressure at the selected three distinguished locations are plotted in Fig. 4b. At each selected corner region, the phase shift values within 3 × 3 × 3 pixel boxes with pixel size 12 nm around the centre were taken, and the averaged values were plotted as a function of pressure in Fig. 4b, where the maximum and minimum values in the 3 × 3 × 3 boxes were used as the error bar range, respectively. The phase shift value is directly connected to the local lattice displacement, thus strain, projected to the measured direction as φ= ·Δ (11).

Bottom Line: Here we report the successful de-convolution of these effects with the recently developed mutual coherent function method to reveal the three-dimensional strain distribution inside a 400 nm gold single crystal during compression within a diamond-anvil cell.The three-dimensional morphology and evolution of the strain under pressures up to 6.4 GPa were obtained with better than 30 nm spatial resolution.In addition to providing a new approach for high-pressure nanotechnology and rheology studies, we draw fundamental conclusions about the origin of the anomalous compressibility of nanocrystals.

View Article: PubMed Central - PubMed

Affiliation: High Pressure Synergetic Consortium, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA. wyang@ciw.edu

ABSTRACT
The evolution of morphology and internal strain under high pressure fundamentally alters the physical property, structural stability, phase transition and deformation mechanism of materials. Until now, only averaged strain distributions have been studied. Bragg coherent X-ray diffraction imaging is highly sensitive to the internal strain distribution of individual crystals but requires coherent illumination, which can be compromised by the complex high-pressure sample environment. Here we report the successful de-convolution of these effects with the recently developed mutual coherent function method to reveal the three-dimensional strain distribution inside a 400 nm gold single crystal during compression within a diamond-anvil cell. The three-dimensional morphology and evolution of the strain under pressures up to 6.4 GPa were obtained with better than 30 nm spatial resolution. In addition to providing a new approach for high-pressure nanotechnology and rheology studies, we draw fundamental conclusions about the origin of the anomalous compressibility of nanocrystals.

No MeSH data available.


Related in: MedlinePlus