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Updated: Mar 2, 2026

$Synthesis and Microdiffraction at Extreme Pressures and Temperatures$

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

Strain engineered pyrochlore at high pressure.

Dylan R Rittman¹, Katlyn M Turner², Sulgiye Park²

¹Department of Geological Sciences, Stanford University, Stanford, California, 94305, USA. drittman@stanford.edu.

Scientific Reports

|May 24, 2017

Summary

This summary is machine-generated.

Strain engineering in Dy2Ti2O7 and Dy2Zr2O7 pyrochlores modifies their high-pressure behavior. Defects were tailored to significantly reduce the pressure needed for phase transformations, enhancing material processing.

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High-pressure, High-temperature Deformation Experiment Using the New Generation Griggs-type Apparatus

High-pressure, High-temperature Deformation Experiment Using the New Generation Griggs-type Apparatus

Published on: April 3, 2018

Area of Science:

Materials Science
Solid State Chemistry
High-Pressure Physics

Background:

Strain engineering is crucial for developing advanced materials.
Defect control in pyrochlores influences their structural and mechanical properties.
Understanding high-pressure phase transitions is key for material applications.

Purpose of the Study:

To investigate the effects of strain engineering on the high-pressure behavior of Dy2Ti2O7 and Dy2Zr2O7 pyrochlores.
To tailor intrinsic and extrinsic strain using mechanical milling and annealing.
To correlate defect concentration and species with phase transformation pressures.

Main Methods:

Mechanical milling and annealing for strain induction.
Diamond anvil cell for high-pressure compression.
Raman spectroscopy and X-ray diffraction for in situ analysis.
X-ray pair distribution function analysis for structural characterization.

Main Results:

High-pressure behavior is dependent on ambient defect characteristics.
Engineered defects reduced phase transformation onset pressure by ~50% in Dy2Ti2O7.
Engineered defects reduced phase transformation completion pressure by ~20% in Dy2Zr2O7.
Mechanical integrity, indicated by bulk modulus, was largely preserved.

Conclusions:

Strain engineering offers a viable route to modify the high-pressure response of pyrochlores.
Defect manipulation can significantly lower phase transformation pressures.
This approach holds promise for optimizing materials for high-pressure applications.