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Title of Journal: Phys Chem Minerals

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Abbravation: Physics and Chemistry of Minerals

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Springer Berlin Heidelberg

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

Authors: Sanae Koizumi, Tohru S. Suzuki, Yoshio Sakka, Kosuke Yabe, Takehiko Hiraga,

Publish Date: 2016/07/09
Volume: 43, Issue:10, Pages: 689-706
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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.,



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