CaO-FeO-Fe20 a has long been recognized as important _l _ in connexion with iron-making and has been the subject of many investigations. The following compounds have been reported, the references given being selected with regard to their containing X-ray data:

content within the complete sustained-release K 2 FeO 4 system was studied. The optimal K 2 FeO 4 content within the sustained-release K 2 FeO 4 system was approximately 70%. In natural water samples, sustained-release K 2 FeO 4 at a dosage of 0.06 g/L and with a reaction time of 20 minutes removed 36

An isothermal phase diagram for the Fe-Cr-O system is presented for 1300 ~ which, with a minor modification, holds for 1000 ~ It is observed that Fe-Cr alloys containing over 13 % Cr are in equi l ibr ium with Cr~O ~ containing a l itt le dissolved Fe~O3. Al loys of lower chromium content

during the pyrometallurgical valorization of Cu and Cu alloys. The optimum experimental conditions for the valorization of Cu-Mg scraps (0.59% Mg) were found to be 1200 o C; a slag composition of 16% CaO, 49% FeO, 35% SiO 2 + B 2 O 3 ; chrome-corundum refractory brick with a ceramic-chemical bonding

the equilibrium mineralogy of mantle assemblages by Gibbs energy minimization. The numerical code can handle arbitrary elemental composition in the system MgO, FeO, CaO, Al2O3 and SiO2 and reaches the thermodynamic equilibrium by choosing the abundances of 31 minerals belonging to 14 possible phases. The code can

HOHMANNITE is a hydrated sulphate of ferric iron with the formula Fe2(SO4)2(OH)2.7H20 (Palache, Berman, and Frondel, 1951). Figs. 1 and 2 illustrate the structure of hohman-nite. The first shows a complex chain of Fe(O, H20)6 octahedra nd SO4 tetrahedra, which runs along the c axis; the second

-correlated FeO. We conclude that iron-based superconductors are weakly- or at most moderately-correlated systems. PACS numbers: 71.20.Dg, 74.25.Jb Submitted to: J. Phys.: Condens. MatterIdentifying valence structure in LiFeAs and NaFeAs with core-level spectroscopy 2

Studies of fluids trapped in micro-inclusions in diamonds from Africa have demonstrated the existence of a wide range of fluid compositions, spanning the full range from a carbonatitic end-member, rich in CaO, FeO, MgO, K20, and carbonates to a hydrous end-member, rich in SiO2, 1(20, A1203

-grained phlogopite^garnet-websterite, phlogopite^ garnet-websterite, phlogopite-free garnet-websterite, inclusion-rich garnetite, garnetite, eclogite, retrograde omphacitite and felsic amphi-bole-pegmatite.The MgO, FeO and CaO contents generally decrease from the pristine peridotite towards the most metasomatized

for the PbO-B20,-Fe,O, system which is the preferred solvent for magnetic bubble storage technology. Electric conductivity measurements relating to the ionic equilibria are described and a relationship is derived between composition dependence of activation energies and possible polyion formation