Synthesis of crystallographically oriented olivine aggregates using colloidal processing in a strong magnetic field

Sanae Koizumi; Tohru S. Suzuki; Yoshio Sakka; Kosuke Yabe; Takehiko Hiraga

doi:10.1007/s00269-016-0826-5

Synthesis of crystallographically oriented olivine aggregates using colloidal processing in a strong magnetic field

Sanae Koizumi, Tohru S. Suzuki, Yoshio Sakka, Kosuke Yabe, Takehiko Hiraga^*

^*Corresponding author for this work

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

1 Citation (Scopus)

Abstract

This study develops a fabrication technique to obtain Fe-free and Fe-bearing (Fe:Mg = 1:9) olivine aggregates not only with high density and fine grain size but with crystallographic preferred orientation (CPO). A magnetic field (≤12 T) is applied to synthetic, fine-grained (~120 nm), olivine particles dispersed in solvent. The alignment of certain crystallographic axes of the particles with respect to a magnetic direction is anticipated due to magnetic anisotropy of olivine. The dispersed particles are gradually consolidated on a porous alumina mold covered with a solid–liquid separation filter during drainage of the solvent. The resultant aligned consolidated aggregate is then isostatically pressed and vacuum sintered. We find that (1) preparation of fully reacted olivine particles, with less propensity to coalesce; (2) preparation of a suspension with highly dispersed particles; and (3) application of a certain strength of the magnetic field are essential to obtain well-sintered and well-aligned aggregates. High density (i.e., <1 vol% porosity) and fine grain size (~1 μm) Fe-free and Fe-bearing olivine aggregates were successfully synthesized with uniaxially aligned a- and c-axes, respectively. Attempts to uniaxially align the magnetization hard axis and to triaxially align Fe-bearing olivine by rotating the suspension in the magnetic field succeeded in obtaining weakly developed CPO aggregates.

Original language	English
Pages (from-to)	689-706
Number of pages	18
Journal	Physics and Chemistry of Minerals
Volume	43
Issue number	10
DOIs	https://doi.org/10.1007/s00269-016-0826-5
Publication status	Published - 2016 Nov 1
Externally published	Yes

Keywords

Crystallographic preferred orientation
Magnetic alignment
Olivine
Sintering

ASJC Scopus subject areas

Materials Science(all)
Geochemistry and Petrology

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10.1007/s00269-016-0826-5

Cite this

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title = "Synthesis of crystallographically oriented olivine aggregates using colloidal processing in a strong magnetic field",

abstract = "This study develops a fabrication technique to obtain Fe-free and Fe-bearing (Fe:Mg = 1:9) olivine aggregates not only with high density and fine grain size but with crystallographic preferred orientation (CPO). A magnetic field (≤12 T) is applied to synthetic, fine-grained (~120 nm), olivine particles dispersed in solvent. The alignment of certain crystallographic axes of the particles with respect to a magnetic direction is anticipated due to magnetic anisotropy of olivine. The dispersed particles are gradually consolidated on a porous alumina mold covered with a solid–liquid separation filter during drainage of the solvent. The resultant aligned consolidated aggregate is then isostatically pressed and vacuum sintered. We find that (1) preparation of fully reacted olivine particles, with less propensity to coalesce; (2) preparation of a suspension with highly dispersed particles; and (3) application of a certain strength of the magnetic field are essential to obtain well-sintered and well-aligned aggregates. High density (i.e., <1 vol% porosity) and fine grain size (~1 μm) Fe-free and Fe-bearing olivine aggregates were successfully synthesized with uniaxially aligned a- and c-axes, respectively. Attempts to uniaxially align the magnetization hard axis and to triaxially align Fe-bearing olivine by rotating the suspension in the magnetic field succeeded in obtaining weakly developed CPO aggregates.",

keywords = "Crystallographic preferred orientation, Magnetic alignment, Olivine, Sintering",

author = "Sanae Koizumi and Suzuki, {Tohru S.} and Yoshio Sakka and Kosuke Yabe and Takehiko Hiraga",

note = "Funding Information: We thank Ube Materials, S. Ohtsuka, T. Moroyama, M. Uchida, N. Hokanishi, A. Takeuchi, and A. Yasuda for their technical assistances. A portion of this work was conducted at the Center for Nano Lithography and Analysis of the University of Tokyo, supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. This study was supported by the JSPS through Grant-in-Aid for Scientific Research 26247087, 26610170, and 15H05827 and Earthquake Research Institute{\textquoteright}s cooperative research program to T.H. Publisher Copyright: {\textcopyright} 2016, Springer-Verlag Berlin Heidelberg.",

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doi = "10.1007/s00269-016-0826-5",

language = "English",

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T1 - Synthesis of crystallographically oriented olivine aggregates using colloidal processing in a strong magnetic field

AU - Koizumi, Sanae

AU - Suzuki, Tohru S.

AU - Sakka, Yoshio

AU - Yabe, Kosuke

AU - Hiraga, Takehiko

N1 - Funding Information: We thank Ube Materials, S. Ohtsuka, T. Moroyama, M. Uchida, N. Hokanishi, A. Takeuchi, and A. Yasuda for their technical assistances. A portion of this work was conducted at the Center for Nano Lithography and Analysis of the University of Tokyo, supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. This study was supported by the JSPS through Grant-in-Aid for Scientific Research 26247087, 26610170, and 15H05827 and Earthquake Research Institute’s cooperative research program to T.H. Publisher Copyright: © 2016, Springer-Verlag Berlin Heidelberg.

PY - 2016/11/1

Y1 - 2016/11/1

N2 - This study develops a fabrication technique to obtain Fe-free and Fe-bearing (Fe:Mg = 1:9) olivine aggregates not only with high density and fine grain size but with crystallographic preferred orientation (CPO). A magnetic field (≤12 T) is applied to synthetic, fine-grained (~120 nm), olivine particles dispersed in solvent. The alignment of certain crystallographic axes of the particles with respect to a magnetic direction is anticipated due to magnetic anisotropy of olivine. The dispersed particles are gradually consolidated on a porous alumina mold covered with a solid–liquid separation filter during drainage of the solvent. The resultant aligned consolidated aggregate is then isostatically pressed and vacuum sintered. We find that (1) preparation of fully reacted olivine particles, with less propensity to coalesce; (2) preparation of a suspension with highly dispersed particles; and (3) application of a certain strength of the magnetic field are essential to obtain well-sintered and well-aligned aggregates. High density (i.e., <1 vol% porosity) and fine grain size (~1 μm) Fe-free and Fe-bearing olivine aggregates were successfully synthesized with uniaxially aligned a- and c-axes, respectively. Attempts to uniaxially align the magnetization hard axis and to triaxially align Fe-bearing olivine by rotating the suspension in the magnetic field succeeded in obtaining weakly developed CPO aggregates.

AB - This study develops a fabrication technique to obtain Fe-free and Fe-bearing (Fe:Mg = 1:9) olivine aggregates not only with high density and fine grain size but with crystallographic preferred orientation (CPO). A magnetic field (≤12 T) is applied to synthetic, fine-grained (~120 nm), olivine particles dispersed in solvent. The alignment of certain crystallographic axes of the particles with respect to a magnetic direction is anticipated due to magnetic anisotropy of olivine. The dispersed particles are gradually consolidated on a porous alumina mold covered with a solid–liquid separation filter during drainage of the solvent. The resultant aligned consolidated aggregate is then isostatically pressed and vacuum sintered. We find that (1) preparation of fully reacted olivine particles, with less propensity to coalesce; (2) preparation of a suspension with highly dispersed particles; and (3) application of a certain strength of the magnetic field are essential to obtain well-sintered and well-aligned aggregates. High density (i.e., <1 vol% porosity) and fine grain size (~1 μm) Fe-free and Fe-bearing olivine aggregates were successfully synthesized with uniaxially aligned a- and c-axes, respectively. Attempts to uniaxially align the magnetization hard axis and to triaxially align Fe-bearing olivine by rotating the suspension in the magnetic field succeeded in obtaining weakly developed CPO aggregates.

KW - Crystallographic preferred orientation

KW - Magnetic alignment

KW - Olivine

KW - Sintering

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JO - Physics and Chemistry of Minerals

JF - Physics and Chemistry of Minerals

IS - 10

ER -

Synthesis of crystallographically oriented olivine aggregates using colloidal processing in a strong magnetic field

Abstract

Keywords

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