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Title: Strain engineered pyrochlore at high pressure

Abstract

Strain engineering is a promising method for next-generation materials processing techniques. Here, we use mechanical milling and annealing followed by compression in diamond anvil cell to tailor the intrinsic and extrinsic strain in pyrochlore, Dy 2Ti 2O 7 and Dy 2Zr 2O 7. Raman spectroscopy, X-ray pair distribution function analysis, and X-ray diffraction were used to characterize atomic order over short-, medium-, and long-range spatial scales, respectively, under ambient conditions. Raman spectroscopy and X-ray diffraction were further employed to interrogate the material in situ at high pressure. High-pressure behavior is found to depend on the species and concentration of defects in the sample at ambient conditions. Overall, we show that defects can be engineered to lower the phase transformation onset pressure by ~50% in the ordered pyrochlore Dy 2Ti 2O 7, and lower the phase transformation completion pressure by ~20% in the disordered pyrochlore Dy 2Zr 2O 7. Lastly, these improvements are achieved without significantly sacrificing mechanical integrity, as characterized by bulk modulus.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [2];  [3];  [1];  [4]
  1. Stanford Univ., Stanford, CA (United States)
  2. Cinvestav Unidad Saltillo, Coahuila (Mexico)
  3. Carnegie Inst. of Washington, Argonne, IL (United States)
  4. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Materials Science of Actinides (MSA)
Sponsoring Org.:
USDOE
OSTI Identifier:
1368689
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE

Citation Formats

Rittman, Dylan R., Turner, Katlyn M., Park, Sulgiye, Fuentes, Antonio F., Park, Changyong, Ewing, Rodney C., and Mao, Wendy L. Strain engineered pyrochlore at high pressure. United States: N. p., 2017. Web. doi:10.1038/s41598-017-02637-9.
Rittman, Dylan R., Turner, Katlyn M., Park, Sulgiye, Fuentes, Antonio F., Park, Changyong, Ewing, Rodney C., & Mao, Wendy L. Strain engineered pyrochlore at high pressure. United States. doi:10.1038/s41598-017-02637-9.
Rittman, Dylan R., Turner, Katlyn M., Park, Sulgiye, Fuentes, Antonio F., Park, Changyong, Ewing, Rodney C., and Mao, Wendy L. Mon . "Strain engineered pyrochlore at high pressure". United States. doi:10.1038/s41598-017-02637-9. https://www.osti.gov/servlets/purl/1368689.
@article{osti_1368689,
title = {Strain engineered pyrochlore at high pressure},
author = {Rittman, Dylan R. and Turner, Katlyn M. and Park, Sulgiye and Fuentes, Antonio F. and Park, Changyong and Ewing, Rodney C. and Mao, Wendy L.},
abstractNote = {Strain engineering is a promising method for next-generation materials processing techniques. Here, we use mechanical milling and annealing followed by compression in diamond anvil cell to tailor the intrinsic and extrinsic strain in pyrochlore, Dy2Ti2O7 and Dy2Zr2O7. Raman spectroscopy, X-ray pair distribution function analysis, and X-ray diffraction were used to characterize atomic order over short-, medium-, and long-range spatial scales, respectively, under ambient conditions. Raman spectroscopy and X-ray diffraction were further employed to interrogate the material in situ at high pressure. High-pressure behavior is found to depend on the species and concentration of defects in the sample at ambient conditions. Overall, we show that defects can be engineered to lower the phase transformation onset pressure by ~50% in the ordered pyrochlore Dy2Ti2O7, and lower the phase transformation completion pressure by ~20% in the disordered pyrochlore Dy2Zr2O7. Lastly, these improvements are achieved without significantly sacrificing mechanical integrity, as characterized by bulk modulus.},
doi = {10.1038/s41598-017-02637-9},
journal = {Scientific Reports},
number = 1,
volume = 7,
place = {United States},
year = {Mon May 22 00:00:00 EDT 2017},
month = {Mon May 22 00:00:00 EDT 2017}
}

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