Crystallization of some anorthite-diopside glass precursors
نویسندگان
چکیده
منابع مشابه
High-Pressure Equation of State of Molten Anorthite and Diopside
New Hugoniot equation of state data for molten diopside (at 1773 K) and molten anorthite (at 1923 K) are reported to 38 and 35 GPa, respectively. The diopside data (initial density, 2.61 Mg/m s) are described by a straight-line fit to the shock velocity-particle velocity results of Us -3.30 + 1.44 Up km s -1, and our preferred fit to the anorthite data (initial density, 2.55 Mg/m s) is given by...
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diopside (CaO·MgO·2SiO2) and wollastonite (CaO·SiO2) glass-ceramics, forming ∼60% crystal phase and ∼40% albite-like Na2O·Al2O3·6SiO2) residual glass were studied. Two other diopside glass-ceramics with higher Na2O and Al2O3 content were also investigated. The phase formation was estimated by DTA, XRD and pycnometry, while the densification process was evaluated by porosity variations, ilatomet...
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[1] We determined the equation of state (EOS) of three silicate liquid compositions by shock compression of preheated samples up to 127 GPa. Diopside (Di; Ca2Mg2SiO6) at 1773 K, anorthite (An; CaAl2Si2O8) at 1923 K and the eutectic composition Di64An36 at 1673 K were previously studied by shock compression to 38 GPa. The new data extend the EOS of each composition nearly to the Earth’s core‐man...
متن کاملSurface nucleation and growth in Anorthite glass
Qualitative and quantitative studies of surface nucleation and growth were carried out with a glass having a composition close to Anorthite (CaO.Al2O3.2SiO2). Quasi-isometric hexagonal and elongated hexagonal crystals assumed to belong to the same phase, and a few rectangular crystals were observed after continuous or cumulative (intermittent) thermal treatments. The EDS analysis revealed that ...
متن کاملProperties of sintered glass-ceramics in the diopside–albite system
A series of sintered glass-ceramics belonging to the system diopside–albite, forming by surface crystallization 30, 50 and 65% diopside, was investigated. In order to study the effect of bulk crystallization on the sintering a 0.7% of Cr2O3 as nucleation agent was added in one of the compositions. The crystallization was evaluated by DTA and density measurements and the degree of densification ...
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ژورنال
عنوان ژورنال: Journal of Materials Science
سال: 1991
ISSN: 0022-2461,1573-4803
DOI: 10.1007/bf00549889