Sound velocities of Na0.4Mg0.6Al1.6Si0.4O4 NAL and CF phases to 73 GPa determined by Brillouin scattering method

Lidong Dai; Yuki Kudo; Kei Hirose; Motohiko Murakami; Yuki Asahara; Haruka Ozawa; Yasuo Ohishi; Naohisa Hirao

doi:10.1007/s00269-012-0558-0

Sound velocities of Na_0.4Mg_0.6Al_1.6Si_0.4O₄ NAL and CF phases to 73 GPa determined by Brillouin scattering method

Lidong Dai, Yuki Kudo, Kei Hirose, Motohiko Murakami, Yuki Asahara, Haruka Ozawa, Yasuo Ohishi, Naohisa Hirao

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

18 Citations (Scopus)

Abstract

The sound velocities of two aluminum-rich phases in the lower mantle, hexagonal new Al-rich phase (NAL) and its corresponding high-pressure polymorph orthorhombic Ca-ferrite-type phase (CF), were determined with the Brillouin scattering method in a pressure range from 9 to 73 GPa at room temperature. Both NAL and CF samples have identical chemical composition of Na_{0. 4}Mg_{0. 6}Al_{1. 6}Si_{0. 4}O₄ (40 % NaAlSiO₄-60 % MgAl₂O₄). Infrared laser annealing in the diamond anvil cell was performed to minimize the stress state of the sample and obtain the high-quality Brillouin spectra. The results show shear modulus at zero pressure G₀ = 121. 960 ± 0. 087 GPa and its pressure derivative G' = 1. 961 ± 0. 009 for the NAL phase, and G₀ = 129. 653 ± 0. 059 GPa and G' = 2. 340 ± 0. 004 for the CF phase. The zero-pressure shear velocities of the NAL and CF phases are obtained to be 5. 601 ± 0. 005 km/sec and 5. 741 ± 0. 001 km/sec, respectively. We also found that shear velocity increases by 2. 5 % upon phase transition from NAL to CF at around 40 GPa.

Original language	English
Pages (from-to)	195-201
Number of pages	7
Journal	Physics and Chemistry of Minerals
Volume	40
Issue number	3
DOIs	https://doi.org/10.1007/s00269-012-0558-0
Publication status	Published - Mar 2013

Keywords

CF phase
High pressure
MORB
NAL phase
Sound velocity

ASJC Scopus subject areas

Materials Science(all)
Geochemistry and Petrology

Access to Document

10.1007/s00269-012-0558-0

Cite this

@article{aeb96b6c939b4d20a07f0791a1ee0d6d,

title = "Sound velocities of Na0.4Mg0.6Al1.6Si0.4O4 NAL and CF phases to 73 GPa determined by Brillouin scattering method",

abstract = "The sound velocities of two aluminum-rich phases in the lower mantle, hexagonal new Al-rich phase (NAL) and its corresponding high-pressure polymorph orthorhombic Ca-ferrite-type phase (CF), were determined with the Brillouin scattering method in a pressure range from 9 to 73 GPa at room temperature. Both NAL and CF samples have identical chemical composition of Na0. 4Mg0. 6Al1. 6Si0. 4O4 (40 % NaAlSiO4-60 % MgAl2O4). Infrared laser annealing in the diamond anvil cell was performed to minimize the stress state of the sample and obtain the high-quality Brillouin spectra. The results show shear modulus at zero pressure G0 = 121. 960 ± 0. 087 GPa and its pressure derivative G' = 1. 961 ± 0. 009 for the NAL phase, and G0 = 129. 653 ± 0. 059 GPa and G' = 2. 340 ± 0. 004 for the CF phase. The zero-pressure shear velocities of the NAL and CF phases are obtained to be 5. 601 ± 0. 005 km/sec and 5. 741 ± 0. 001 km/sec, respectively. We also found that shear velocity increases by 2. 5 % upon phase transition from NAL to CF at around 40 GPa.",

keywords = "CF phase, High pressure, MORB, NAL phase, Sound velocity",

author = "Lidong Dai and Yuki Kudo and Kei Hirose and Motohiko Murakami and Yuki Asahara and Haruka Ozawa and Yasuo Ohishi and Naohisa Hirao",

note = "Funding Information: We thank two anonymous reviewers and editor of Professor Masanori Matsui for their very constructive comments and suggestions in the reviewing process, which helped us greatly in improving the manuscript. The enlightening discussions were conducted with Professor Heping Li and Dr Shuangming Shan from Laboratory for High Temperature and High Pressure Study of the Earth{\textquoteright}s Interior, Institute of Geochemistry, CAS. Dr Saori Imada provides the starting material. The X-ray diffraction measurements were conducted at BL10XU, SPring-8 (Proposal no. 2011B0087 and 2012A0087). This research was financially supported by the “135” Program of Institute of Geochemistry, CAS, the Knowledge-Innovation Key Orientation Project of CAS (KZCX2-YWQN110), NSF of China (41174079 and 40974051), and the Japan Society for the Promotion of Science.",

year = "2013",

month = mar,

doi = "10.1007/s00269-012-0558-0",

language = "English",

volume = "40",

pages = "195--201",

journal = "Physics and Chemistry of Minerals",

issn = "0342-1791",

publisher = "Springer Verlag",

number = "3",

}

TY - JOUR

T1 - Sound velocities of Na0.4Mg0.6Al1.6Si0.4O4 NAL and CF phases to 73 GPa determined by Brillouin scattering method

AU - Dai, Lidong

AU - Kudo, Yuki

AU - Hirose, Kei

AU - Murakami, Motohiko

AU - Asahara, Yuki

AU - Ozawa, Haruka

AU - Ohishi, Yasuo

AU - Hirao, Naohisa

N1 - Funding Information: We thank two anonymous reviewers and editor of Professor Masanori Matsui for their very constructive comments and suggestions in the reviewing process, which helped us greatly in improving the manuscript. The enlightening discussions were conducted with Professor Heping Li and Dr Shuangming Shan from Laboratory for High Temperature and High Pressure Study of the Earth’s Interior, Institute of Geochemistry, CAS. Dr Saori Imada provides the starting material. The X-ray diffraction measurements were conducted at BL10XU, SPring-8 (Proposal no. 2011B0087 and 2012A0087). This research was financially supported by the “135” Program of Institute of Geochemistry, CAS, the Knowledge-Innovation Key Orientation Project of CAS (KZCX2-YWQN110), NSF of China (41174079 and 40974051), and the Japan Society for the Promotion of Science.

PY - 2013/3

Y1 - 2013/3

N2 - The sound velocities of two aluminum-rich phases in the lower mantle, hexagonal new Al-rich phase (NAL) and its corresponding high-pressure polymorph orthorhombic Ca-ferrite-type phase (CF), were determined with the Brillouin scattering method in a pressure range from 9 to 73 GPa at room temperature. Both NAL and CF samples have identical chemical composition of Na0. 4Mg0. 6Al1. 6Si0. 4O4 (40 % NaAlSiO4-60 % MgAl2O4). Infrared laser annealing in the diamond anvil cell was performed to minimize the stress state of the sample and obtain the high-quality Brillouin spectra. The results show shear modulus at zero pressure G0 = 121. 960 ± 0. 087 GPa and its pressure derivative G' = 1. 961 ± 0. 009 for the NAL phase, and G0 = 129. 653 ± 0. 059 GPa and G' = 2. 340 ± 0. 004 for the CF phase. The zero-pressure shear velocities of the NAL and CF phases are obtained to be 5. 601 ± 0. 005 km/sec and 5. 741 ± 0. 001 km/sec, respectively. We also found that shear velocity increases by 2. 5 % upon phase transition from NAL to CF at around 40 GPa.

AB - The sound velocities of two aluminum-rich phases in the lower mantle, hexagonal new Al-rich phase (NAL) and its corresponding high-pressure polymorph orthorhombic Ca-ferrite-type phase (CF), were determined with the Brillouin scattering method in a pressure range from 9 to 73 GPa at room temperature. Both NAL and CF samples have identical chemical composition of Na0. 4Mg0. 6Al1. 6Si0. 4O4 (40 % NaAlSiO4-60 % MgAl2O4). Infrared laser annealing in the diamond anvil cell was performed to minimize the stress state of the sample and obtain the high-quality Brillouin spectra. The results show shear modulus at zero pressure G0 = 121. 960 ± 0. 087 GPa and its pressure derivative G' = 1. 961 ± 0. 009 for the NAL phase, and G0 = 129. 653 ± 0. 059 GPa and G' = 2. 340 ± 0. 004 for the CF phase. The zero-pressure shear velocities of the NAL and CF phases are obtained to be 5. 601 ± 0. 005 km/sec and 5. 741 ± 0. 001 km/sec, respectively. We also found that shear velocity increases by 2. 5 % upon phase transition from NAL to CF at around 40 GPa.

KW - CF phase

KW - High pressure

KW - MORB

KW - NAL phase

KW - Sound velocity

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U2 - 10.1007/s00269-012-0558-0

DO - 10.1007/s00269-012-0558-0

M3 - Article

AN - SCOPUS:84874371975

SN - 0342-1791

VL - 40

SP - 195

EP - 201

JO - Physics and Chemistry of Minerals

JF - Physics and Chemistry of Minerals

IS - 3

ER -