Site occupancies of spinel solid solutions
نویسندگان
چکیده
منابع مشابه
Cation distributions and thermodynamic properties of binary spinel solid solutions
A general model is presented to enable the calculation of the cation distribution and thermodynamic properties of any binary solid solution between oxide spinels containing 2*, 3* and 4* cations. The model includes the effect ofdisordering enthalpy which depends linearly on the degree of disorder. In addition there are important contributions to the thermodynamic properties from the size mismat...
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The addition of small amounts (2-10 wt %) of SiO2 to γ-Al2O3 increases the temperature of heat treatment necessary for transformation to R-Al2O3 by ∼100 K. We have studied this system using high-temperature solution calorimetry in molten 2PbO‚B2O3 at 1043 K. Our results indicate that the spinel-type Al2O3-SiO2 solid solutions with 2-10 wt % SiO2 are always energetically metastable by 30-35 kJ‚m...
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The bare and pre-oxidized AISI 430 pieces were screen printed by copper ferrite spinel coatings. Good bonding between the coating and the substrate was achieved by the reactive sintering process of the reduced coating. The energy dispersive X-ray spectroscopy (EDS) analysis revealed that the scale is a double layer consisting of a chromia-rich subscale and an outer Cu/Fe-rich spinel. The result...
متن کاملDevelopment of Copper-Ferrite Spinel Coating on AISI 430 Steel Used as Solid Oxide Fuel Cell
The bare and pre-oxidized AISI 430 pieces were screen printed by copper ferrite spinel coatings. Good bonding between the coating and the substrate was achieved by the reactive sintering process of the reduced coating. The energy dispersive X-ray spectroscopy (EDS) analysis revealed that the scale is a double layer consisting of a chromia-rich subscale and an outer Cu/Fe-rich spinel. The result...
متن کاملNear - Infrared and Mossbauer Study of Cation Site Occupancies in Tourmalines
Mbssbauer and near-infrared spectral measurements have been made on several tourmaline minerals representing both the elbaite-schorl and dravite-schorl series. The specimens were characterized by cell dimension measurements, and by partial chemical analyses by electron microprobe. M'ssbauer data for the iron-bearing specimens further substantiated the presence of ferrous and ferric cations in b...
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ژورنال
عنوان ژورنال: Acta Crystallographica Section A Foundations of Crystallography
سال: 2000
ISSN: 0108-7673
DOI: 10.1107/s0108767300029147