... 5.4 (wüstite+ulvøspinel: 5.6) Akimotoite MgSiO 3 Tomioka and Fujino 1997 ; Sharp et al. 1997 3.8 (enstatite: 3.2) Hemleyite FeSiO 3 Bindi et al. 2017 4.8 c (ferrosilite:3.6) Wangdaodeite FeTiO 3 Xie et al. 2016 4.9 (ilmenite: 4.8) Liuite FeTiO 3 Ma et al. 2018...

... of dissolution experiments in alkali-rich and H 2 O fluids at 925 °C and 1.5 GPa. The oxygen fugacity was controlled with seven different solid-state buffers and ranged from about the iron-wüstite to above the magnetite-hematite equilibrium reactions. The solubility of natural monazite increases monotonically...

... and the mantle. Iron is the most important multivalent transitional metal in the mantle, and the stability fields of different iron oxides covers the mantle conditions in the P-T-f O2 space. Certain iron oxides, such as magnetite (Fe 3 O 4 ) and wüstite (Fe 1–x O) and their solid solutions with periclase (MgO...

... decreases as a function of increasing iron content from periclase to wüstite and K 0T ′ is consistent with an approximately constant value of 4.0 that is independent of iron content, at least up to the iron concentration measured here. In combination with previously reported thermal parameters, we compute...

... 4 [Si 8 Al 4 O 36 ]. The minerals crystallized in residual Si-Al-K and Si-Al-Ca-Fe immiscible melts after spinel, anorthite–bytownite, melilite, Al-clinopyroxene ± Mg-Fe olivine, together with Fe 3+ -bearing hercynite, Ca-rich fayalite, kirschsteinite, pyrrhotite ± native iron, wüstite, magnetite...

... of zircon grains showing well-developed crystal faces. Wüstite occurs as small spheres, generally 50–200 mm in diameter, and also as single crystals and as rims on the spheres of native Fe. The wüstite compositions are shown in the energy spectra in Figure 9 . Figure 9. (A) Microphotographs...

... inclusions of moissanite + wüstite + native Fe in olivine; (3) FeNi and FeCr alloys in olivine and chromite; and (4) native Fe and Si in chromite. Crustal asphaltum and h-BN also occur as inclusions in chromite. Our documented in situ SuR UHP phases, combined with the previously inferred existence...

... Nymphaeum, (16) Domestic area, (18) Potters’ Quarter, (19) City survey in the Necropolis. Figure 2 ( a ) Transition of skeletal to closely packed wüstite (approaching hammer scale texture) in group A. ( b ) Hopper-shaped wüstite in group A. ( c ) Transition of closely spaced wüstite to a patch...

..., such as parascandolaite KMgF 3 (that is stable at pressures of up to 50 GPa) in association with orthorhombic MgO, and porous dolomite occurring together with nanoinclusions of calcite, apatite, spinel, Fe-sulfide, and an assemblage of periclase plus wüstite. These minerals belong to the carbonatitic association...

... to investigate how a model reduced Fe-oxide surface (wüstite, Fe 1– x O) alters as a function of exposure to aqueous solutions with compositions representative of conditions expected within a GDF. Additional experiments were performed to constrain the effect that highly alkaline solutions (up to pH 13) have...

..., with the corundum structure), Fe 3 O 4 (magnetite, a spinel) and FeO (wüstite, which shares its structure with periclase), as well as a host of synthetic and sub-stoichiometric forms. Under high-pressure, high-temperature (HPHT) conditions, several phase transitions have been observed in hematite (e.g. Rozenberg...

...T. R. Welberry; D. J. Goossens; A. P. Heerdegen Abstract We show how different aspects of a model of the complex disordered structure of wüstite, Fe 1– x O, affect the pair distribution function (PDF) and powder diffraction pattern. The aim is to assess the efficacy of using these techniques...

... sulfur. Overall the Fe-S monitor technique is a convenient method to determine the sulfur fugacity in high-temperature experiments containing CO-CO 2 -SO 2 gas mixtures as long as oxygen fugacities remain below that of the iron-wüstite or iron-magnetite buffer. * E-mail: holzheid@min.uni-kiel.de...

.... The enthalpies of wüstite (FeO) and magnetite (Fe 3 O 4 ) oxidation to hematite (Fe 2 O 3 ) were measured using oxidative drop solution calorimetry in which the final product is dissolved ferric oxide. Two methods were applied: drop solution calorimetry at 1073 K in lead borate solvent and at 973 K in sodium...