Abstract
Nanocrystalline olivine-structured Mg2SiO4 and MgCoSiO4, with an average particle size of 27 nm and 31 nm, respectively, were successfully synthesized from oxide precursors via mechanochemical methods. The two nanocrystalline products were obtained after milling for 360 min and displayed high concentrations of Mg2SiO4 (>94%) and MgCoSiO4 (>95%), together with minor amounts of WC (~3%) contaminant originating as debris abraded off milling balls and chambers. The macroscopic temperature monitoring of the grinding jars during milling trials recorded a peak temperature of 75 °C. A combination of analytical techniques that included XRD, TEM, SAED, and EDS were employed for the characterization of the synthesized products.
Highlights
Nanocrystalline Olivine-TypeOlivine-type orthosilicates (M,N)2 SiO4, where M and N are mainly Fe and Mg, with small amounts of Co, Mn, Ca, and Ni present, represent a fundamental class of minerals of mafic and ultramafic igneous rocks in the crust and upper mantle of the Earth [1–3].While forsterite (Mg2 SiO4 ) and fayalite (Fe2 SiO4 ) are the predominant end members, other binary silicates—i.e., larnite (Ca2 SiO4 ); liebenbergite (Ni2 SiO4 ); tephroite (Mn2 SiO4 ); andCa-containing ternary silicates, i.e., kirschsteinite (CaFeSiO4 ), monticellite (CaMgSiO4 ), and glaucochroite (CaMnSiO4 )—are naturally occurring minerals
The transformation of α-Mg2 SiO4 to β-Mg2 SiO4 and γ-Mg2 SiO4 occurs at elevated pressure and temperature, yet both stabilize at ambient conditions upon quenching
In an effort to standardize the Mg-Co silicate solution series preparation, we report here the results of our investigation into the mechanochemical synthesis of olivine-type Mg2 SiO4 and ternary olivine MgCoSiO4, starting with stoichiometric amounts of MgO, SiO2 and CoO, MgO, SiO2, respectively
Summary
Nanocrystalline Olivine-TypeOlivine-type orthosilicates (M,N) SiO4 , where M and N are mainly Fe and Mg, with small amounts of Co, Mn, Ca, and Ni present, represent a fundamental class of minerals of mafic and ultramafic igneous rocks in the crust and upper mantle of the Earth [1–3].While forsterite (Mg2 SiO4 ) and fayalite (Fe2 SiO4 ) are the predominant end members, other binary silicates—i.e., larnite (Ca2 SiO4 ); liebenbergite (Ni2 SiO4 ); tephroite (Mn2 SiO4 ); andCa-containing ternary silicates, i.e., kirschsteinite (CaFeSiO4 ), monticellite (CaMgSiO4 ), and glaucochroite (CaMnSiO4 )—are naturally occurring minerals. Olivine-type orthosilicates (M,N) SiO4 , where M and N are mainly Fe and Mg, with small amounts of Co, Mn, Ca, and Ni present, represent a fundamental class of minerals of mafic and ultramafic igneous rocks in the crust and upper mantle of the Earth [1–3]. While forsterite (Mg2 SiO4 ) and fayalite (Fe2 SiO4 ) are the predominant end members, other binary silicates—i.e., larnite (Ca2 SiO4 ); liebenbergite (Ni2 SiO4 ); tephroite (Mn2 SiO4 ); and. Ca-containing ternary silicates, i.e., kirschsteinite (CaFeSiO4 ), monticellite (CaMgSiO4 ), and glaucochroite (CaMnSiO4 )—are naturally occurring minerals. The naturally occurring solid solution series of olivine (Fe1−x Mgx ) SiO4 has been the subject of intensive research for refractories, battery materials, mineralogy, and carbon sequestration [8–12]. The transformation of α-Mg2 SiO4 to β-Mg2 SiO4 and γ-Mg2 SiO4 occurs at elevated pressure and temperature, yet both stabilize at ambient conditions upon quenching
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