Abstract
It is always a goal of scientists to develop new techniques to identify the composition of mantle materials and understand geodynamic processes accurately. Ferropericlase (Mg,Fe)O is a prominent mineral in the lower mantel. It is a common practice in the research community to prepare ferropericlase using a solid-phase synthesis method or high-pressure experiment synthesis method. This conventional method contains a number of ambiguities a great deal of time is needed. In this paper, we have addressed the drawbacks of the conventional technique using a liquid-phase synthesis method to prepare ferropericlase. During the experiment, oxalic acid was added to a mixed solution of ferrous sulfate and magnesium chloride and mixed according to the molar ratio. The formed magnesium iron oxalate precipitate was sintered and reduced into the final sample. Furthermore, the final sample was analyzed using XRD and SEM. Compared to the solid-phase method, this coprecipitation method could produce ferropericlase with a shorter sintering time, lower sintering temperature, and a reduction in the amount of gas consumed. XRD and SEM results show that the liquid-phase method produced samples with better composition homogeneity.
Highlights
The depth of the lower mantle is 660–2890 km, the temperature range is 1600–2450 K, and the pressure range is 24–135 GPpa
For the preparation of ferropericlase, the solid-phase method is used in most experiments
Because the sintering time is long for the solid-phase synthesis method of preparing ferropericlase, large amounts of gases are needed to reduce Fe3+ to Fe2+ during the experimental process
Summary
The depth of the lower mantle is 660–2890 km, the temperature range is 1600–2450 K, and the pressure range is 24–135 GPpa. The majority of researchers use the solid-phase method to synthesize the (Mg,Fe)O solution, which is mainly to sinter the mixed powder of MgO and Fe2 O3 at a suitable. Holzapfel et al (2003) [16] synthesized (Mg,Fe)O by sintering a Fe2 O3 and MgO mixed powder for 20 h at 1673 K, with the oxygen fugacity at NNO-1.6, regrinding and sintering twice to produce ferropericlase. The solid-phase synthesis method directly mixes MgO and Fe2 O3 powder. Spiridigliozzi et al (2016) [39] synthesized nanocrystalline 20 mol% samaria-doped ceria (Ce0.8 Sm0.2 O1.9 ) by coprecipitation techniques with four precipitating agents in an aqueous solution: powders (Ce0.8Sm0.2O1.9) by coprecipitation techniques with four precipitating agents in an aqueous ammonia, ammonium carbonate, tetramethyl ammonium hydroxide, and urea.
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