Deformation of NaCoF.sub.3 perovskite and post-perovskite up to 30 GPa and 1013 K: implications for plastic deformation and transformation mechanism
Texture, plastic deformation, and phase transformation mechanisms in perovskite and post-perovskite are of general interest for our understanding of the Earth's mantle. Here, the perovskite analogue NaCoF.sub.3 is deformed in a resistive-heated diamond anvil cell (DAC) up to 30 GPa and 1013 K....
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Published in | European journal of mineralogy (Stuttgart) Vol. 33; no. 5; p. 591 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Copernicus GmbH
30.09.2021
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Abstract | Texture, plastic deformation, and phase transformation mechanisms in perovskite and post-perovskite are of general interest for our understanding of the Earth's mantle. Here, the perovskite analogue NaCoF.sub.3 is deformed in a resistive-heated diamond anvil cell (DAC) up to 30 GPa and 1013 K. The in situ state of the sample, including crystal structure, stress, and texture, is monitored using X-ray diffraction. A phase transformation from a perovskite to a post-perovskite structure is observed between 20.1 and 26.1 GPa. Normalized stress drops by a factor of 3 during transformation as a result of transient weakening during the transformation. The perovskite phase initially develops a texture with a maximum at 100 and a strong 010 minimum in the inverse pole figure of the compression direction. Additionally, a secondary weaker 001 maximum is observed later during compression. Texture simulations indicate that the initial deformation of perovskite requires slip along (100) planes with significant contributions of {110} twins. Following the phase transition to post-perovskite, we observe a 010 maximum, which later evolves with compression. The transformation follows orientation relationships previously suggested where the c axis is preserved between phases and hh0 vectors in reciprocal space of post-perovskite are parallel to [010] in perovskite, which indicates a martensitic-like transition mechanism. A comparison between past experiments on bridgmanite and current results indicates that NaCoF.sub.3 is a good analogue to understand the development of microstructures within the Earth's mantle. |
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AbstractList | Texture, plastic deformation, and phase transformation mechanisms in perovskite and post-perovskite are of general interest for our understanding of the Earth's mantle. Here, the perovskite analogue NaCoF.sub.3 is deformed in a resistive-heated diamond anvil cell (DAC) up to 30 GPa and 1013 K. The in situ state of the sample, including crystal structure, stress, and texture, is monitored using X-ray diffraction. A phase transformation from a perovskite to a post-perovskite structure is observed between 20.1 and 26.1 GPa. Normalized stress drops by a factor of 3 during transformation as a result of transient weakening during the transformation. The perovskite phase initially develops a texture with a maximum at 100 and a strong 010 minimum in the inverse pole figure of the compression direction. Additionally, a secondary weaker 001 maximum is observed later during compression. Texture simulations indicate that the initial deformation of perovskite requires slip along (100) planes with significant contributions of {110} twins. Following the phase transition to post-perovskite, we observe a 010 maximum, which later evolves with compression. The transformation follows orientation relationships previously suggested where the c axis is preserved between phases and hh0 vectors in reciprocal space of post-perovskite are parallel to [010] in perovskite, which indicates a martensitic-like transition mechanism. A comparison between past experiments on bridgmanite and current results indicates that NaCoF.sub.3 is a good analogue to understand the development of microstructures within the Earth's mantle. |
Audience | Academic |
Author | Dobson, David P Merkel, Sébastien Gay, Jeffrey P Miyagi, Lowell Langrand, Christopher Liermann, Hanns-Peter Couper, Samantha |
Author_xml | – sequence: 1 fullname: Gay, Jeffrey P – sequence: 2 fullname: Miyagi, Lowell – sequence: 3 fullname: Couper, Samantha – sequence: 4 fullname: Langrand, Christopher – sequence: 5 fullname: Dobson, David P – sequence: 6 fullname: Liermann, Hanns-Peter – sequence: 7 fullname: Merkel, Sébastien |
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Title | Deformation of NaCoF.sub.3 perovskite and post-perovskite up to 30 GPa and 1013 K: implications for plastic deformation and transformation mechanism |
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