Preparation method of ferropericlase

Abstract

The invention discloses a preparation method of ferropericlase. According to the preparation method, needed initial raw materials are weighted according to the chemical formula of the target product (Mg<x>Fe<1-x>)O, then are subjected to mixed ball-milling in absolute ethyl alcohol, are dried, and are subjected to a plurality of times of high temperature reaction, grinding, and sieving so as to obtain a needed material powder; the material powder is subjected to spark plasma sintering so as to obtain uniform and compact ferropericlase, and then is subjected to high-temperature treatment in a reducing atmosphere so as to obtain ferropericlase with strictly controlled ingredients. The preparation method is simple; sintering period is short; sintering cost is low; sintering processes are stable and are convenient for operation; and the obtained ferropericlase is uniform in crystalline grain size distribution, high in density, and high in purity, and is suitable for high pressure shock wave experiments.

Description

technical field [0001] The invention belongs to the field of special ceramics and relates to a preparation method of iron periclase. Background technique [0002] Iron periclase is generally considered to be one of the most important candidate minerals in the lower mantle of the earth, and its various physical and chemical properties under the temperature and pressure conditions of the lower mantle have attracted extensive attention. For example, the experimental data of the equation of state and elastic wave velocity under high temperature and high pressure play a decisive role in defining the true mineralogy composition of the lower mantle through comparison with seismological detection data. However, natural iron periclase samples are generally difficult to obtain, and samples that meet the requirements of high-pressure experiments, especially shock wave high-pressure experiments, are even more difficult to obtain, which brings inconvenience to experimental research. [...

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Problems solved by technology

However, natural iron periclase samples are generally difficult to obtain, and samples that meet the requirements of high-pressure experiments, especially shock wave high-pressure experiments, are even more difficult to obtain, which brings inconvenience to experimental research

[0003] At present, the preparation methods of iron periclase include atmospheric pressure atmosphere sintering and ultra-high pressure synthesis. Among them, atmospheric pressure sintering generally has a long sintering cycle and it is difficult to obtain high-density materials; ultra-high pressure synthesis conditions are harsh and are only suitable for synthesis. Micro-sized samples are difficult to prepare bulk materials, and high-pressure experiments, especially shock wave high-pressure experiments, have relatively high requirements on the properties of samples, especially the compactness of samples.

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