Elastic anisotropy of experimental analogues of perovskite and post-perovskite help to interpret D'' diversity

Akira Yoneda; Hiroshi Fukui; Fang Xu; Akihiko Nakatsuka; Akira Yoshiasa; Yusuke Seto; Kenya Ono; Satoshi Tsutsui; Hiroshi Uchiyama; Alfred Q.R. Baron

doi:10.1038/ncomms4453

Elastic anisotropy of experimental analogues of perovskite and post-perovskite help to interpret D'' diversity

Akira Yoneda, Hiroshi Fukui, Fang Xu, Akihiko Nakatsuka, Akira Yoshiasa, Yusuke Seto, Kenya Ono, Satoshi Tsutsui, Hiroshi Uchiyama, Alfred Q.R. Baron

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

Recent studies show that the D'' layer, just above the Earth's core-mantle boundary, is composed of MgSiO3 post-perovskite and has significant lateral inhomogeneity. Here we consider the D'' diversity as related to the single-crystal elasticity of the post-perovskite phase. We measure the single-crystal elasticity of the perovskite Pbnm-CaIrO3 and post-perovskite Cmcm-CaIrO3 using inelastic X-ray scattering. These materials are structural analogues to same phases of MgSiO3. Our results show that Cmcm-CaIrO3 is much more elastically anisotropic than Pbnm-CaIrO3, which offers an explanation for the enigmatic seismic wave velocity jump at the D'' discontinuity. Considering the relation between lattice preferred orientation and seismic anisotropy in the D'' layer, we suggest that the c axis of post-perovskite MgSiO3 aligns vertically beneath the Circum-Pacific rim, and the b axis vertically beneath the Central Pacific.

Original language	English
Article number	3453
Pages (from-to)	3453
Number of pages	1
Journal	Nature communications
Volume	5
DOIs	https://doi.org/10.1038/ncomms4453
Publication status	Published - 2014
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Biochemistry, Genetics and Molecular Biology(all)
Physics and Astronomy(all)

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@article{774660757bd540848a643a30066b973b,

title = "Elastic anisotropy of experimental analogues of perovskite and post-perovskite help to interpret D'' diversity",

abstract = "Recent studies show that the D'' layer, just above the Earth's core-mantle boundary, is composed of MgSiO3 post-perovskite and has significant lateral inhomogeneity. Here we consider the D'' diversity as related to the single-crystal elasticity of the post-perovskite phase. We measure the single-crystal elasticity of the perovskite Pbnm-CaIrO3 and post-perovskite Cmcm-CaIrO3 using inelastic X-ray scattering. These materials are structural analogues to same phases of MgSiO3. Our results show that Cmcm-CaIrO3 is much more elastically anisotropic than Pbnm-CaIrO3, which offers an explanation for the enigmatic seismic wave velocity jump at the D'' discontinuity. Considering the relation between lattice preferred orientation and seismic anisotropy in the D'' layer, we suggest that the c axis of post-perovskite MgSiO3 aligns vertically beneath the Circum-Pacific rim, and the b axis vertically beneath the Central Pacific. ",

author = "Akira Yoneda and Hiroshi Fukui and Fang Xu and Akihiko Nakatsuka and Akira Yoshiasa and Yusuke Seto and Kenya Ono and Satoshi Tsutsui and Hiroshi Uchiyama and Baron, {Alfred Q.R.}",

note = "Funding Information: This work was supported in part by Grants-in-Aid for Scientific Research (Grant No. 22224008 awarded to A.Y.) from the Japan Society for the Promotion of Science. The inelastic X-ray scattering measurement was carried out on the BL35XU at SPring-8 (Proposal Nos. 2011B1425 and 2012A1406).",

year = "2014",

doi = "10.1038/ncomms4453",

language = "English",

volume = "5",

pages = "3453",

journal = "Nature communications",

issn = "2041-1723",

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TY - JOUR

T1 - Elastic anisotropy of experimental analogues of perovskite and post-perovskite help to interpret D'' diversity

AU - Yoneda, Akira

AU - Fukui, Hiroshi

AU - Xu, Fang

AU - Nakatsuka, Akihiko

AU - Yoshiasa, Akira

AU - Seto, Yusuke

AU - Ono, Kenya

AU - Tsutsui, Satoshi

AU - Uchiyama, Hiroshi

AU - Baron, Alfred Q.R.

N1 - Funding Information: This work was supported in part by Grants-in-Aid for Scientific Research (Grant No. 22224008 awarded to A.Y.) from the Japan Society for the Promotion of Science. The inelastic X-ray scattering measurement was carried out on the BL35XU at SPring-8 (Proposal Nos. 2011B1425 and 2012A1406).

PY - 2014

Y1 - 2014

N2 - Recent studies show that the D'' layer, just above the Earth's core-mantle boundary, is composed of MgSiO3 post-perovskite and has significant lateral inhomogeneity. Here we consider the D'' diversity as related to the single-crystal elasticity of the post-perovskite phase. We measure the single-crystal elasticity of the perovskite Pbnm-CaIrO3 and post-perovskite Cmcm-CaIrO3 using inelastic X-ray scattering. These materials are structural analogues to same phases of MgSiO3. Our results show that Cmcm-CaIrO3 is much more elastically anisotropic than Pbnm-CaIrO3, which offers an explanation for the enigmatic seismic wave velocity jump at the D'' discontinuity. Considering the relation between lattice preferred orientation and seismic anisotropy in the D'' layer, we suggest that the c axis of post-perovskite MgSiO3 aligns vertically beneath the Circum-Pacific rim, and the b axis vertically beneath the Central Pacific.

AB - Recent studies show that the D'' layer, just above the Earth's core-mantle boundary, is composed of MgSiO3 post-perovskite and has significant lateral inhomogeneity. Here we consider the D'' diversity as related to the single-crystal elasticity of the post-perovskite phase. We measure the single-crystal elasticity of the perovskite Pbnm-CaIrO3 and post-perovskite Cmcm-CaIrO3 using inelastic X-ray scattering. These materials are structural analogues to same phases of MgSiO3. Our results show that Cmcm-CaIrO3 is much more elastically anisotropic than Pbnm-CaIrO3, which offers an explanation for the enigmatic seismic wave velocity jump at the D'' discontinuity. Considering the relation between lattice preferred orientation and seismic anisotropy in the D'' layer, we suggest that the c axis of post-perovskite MgSiO3 aligns vertically beneath the Circum-Pacific rim, and the b axis vertically beneath the Central Pacific.

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Elastic anisotropy of experimental analogues of perovskite and post-perovskite help to interpret D'' diversity

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