TY - CHAP
T1 - The postperovskite transition
AU - Shim, Sang Heon
PY - 2008
Y1 - 2008
N2 - The discovery of the postperovskite (PPv) transition has profound impact on our understanding of the core-mantle boundary (CMB) region. Unlike perovskite (Pv), the PPv phase has a layered structure of the SiO6 octahedra, which may lead to a large contrast in some properties with Pv. Recent studies have proposed unusual properties of PPv, such as a large positive Clapeyron slope, a large sensitivity of the transition depth to iron, a decrease in bulk sound speed at the transition, and a development of significant lattice preferred orientation. Many of the proposed properties can provide explanations for the intriguing seismic observations at the CMB region. Yet significant discrepancies still exist. However, rapid developments in mineral physics will continue to improve our knowledge on the changes across the PPv transition. mantle, core-mantle boundary, mantle dynamics, mantle structure, D″ region.
AB - The discovery of the postperovskite (PPv) transition has profound impact on our understanding of the core-mantle boundary (CMB) region. Unlike perovskite (Pv), the PPv phase has a layered structure of the SiO6 octahedra, which may lead to a large contrast in some properties with Pv. Recent studies have proposed unusual properties of PPv, such as a large positive Clapeyron slope, a large sensitivity of the transition depth to iron, a decrease in bulk sound speed at the transition, and a development of significant lattice preferred orientation. Many of the proposed properties can provide explanations for the intriguing seismic observations at the CMB region. Yet significant discrepancies still exist. However, rapid developments in mineral physics will continue to improve our knowledge on the changes across the PPv transition. mantle, core-mantle boundary, mantle dynamics, mantle structure, D″ region.
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U2 - 10.1146/annurev.earth.36.031207.124309
DO - 10.1146/annurev.earth.36.031207.124309
M3 - Chapter
AN - SCOPUS:45149102098
SN - 9780824320362
T3 - Annual Review of Earth and Planetary Sciences
SP - 569
EP - 599
BT - Annual Review of Earth and Planetary Sciences
A2 - Jeanloz, Raymond
A2 - Albee, Arden
A2 - Burke, Kevin
A2 - Freeman, Katherine
ER -