Synthesis of olivine phase and chemical reactions between Mg–Si–O systems under shock compression. (July 2014)

• Record Type: Journal Article
• Authors: Zhang, F.; Liu, Y.; Liu, G.; Du, J.; He, H.
• Is Part Of: Materials research innovations. Volume 18:Number 4(2014)
• Page Start: 684
• Page End: 687
• Publication Date: 2014-07
• Subjects: Materials -- Research -- Periodicals; Matériaux -- Recherche -- Périodiques; 620.1105
• DOI: 10.1179/1432891714Z.000000000760
• Languages: English
• ISSNs: 1432-8917

Abstract

<abstract> <title> <x content-type="archive" xml:space="preserve">Abstract</x> </title> <p>Shock synthesis experiments were conducted by using explosively accelerated flyer plate which impacted the containers. Starting materials in containers were 2MgO+SiO₂ (stoichiometric ratio to form Mg₂SiO₄) or MgO+SiO₂ (stoichiometric ratio to form MgSiO₃) powder mixtures. The structures of the products were determined by X-ray diffraction (XRD). The yield of the olivine phase increases with the increase in impact pressure, when the peak pressure of the container reaches 94·4 GPa, a pure olivine phase was obtained. The MgSiO₃ phase has not been observed and only the olivine phase has been observed when the starting material is 2MgO+SiO₂. Even if the starting material is MgO+SiO₂, the major phase is Mg₂SiO₄ and the XRD peak of MgSiO₃ is not observed until the pressure reaches 94·4 GPa. A vibration theory is proposed to explain this kind of chemoselectivity.</p> </abstract>