Fayalite is widely used in various fields based on its structural characteristics and only exists in weak reducing environments. Excess ZVI (zero-valent iron) is used to regulate oxygen fugacity when synthesizing fayalite. This paper investigates the function of ZVI during the formation of fayalite. The results indicate that ZVI plays two main roles: it is used as an oxygen scavenger to keep the atmosphere in a weakly reduced state and it is used as a reducing agent to reduce Fe 3+ to Fe 2+ , which produces an Fe 1− α O intermediate. The formation of Fe 1− α O is a critical step in Si-O-Fe formation. The XPS and XRD results not only provide proof of this process but also indicate that fayalite formation is actually an exchange process between Fe(II) and Si(IV). These data provide theoretical support for basic research on copper slag and other research related to fayalite.

中文翻译：

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铁橄榄石形成过程中零价铁(ZVI)作用的研究

铁橄榄石因其结构特点而被广泛应用于各个领域，仅存在于弱还原环境中。合成铁橄榄石时，过量的 ZVI（零价铁）用于调节氧逸度。本文研究了 ZVI 在铁橄榄石形成过程中的作用。结果表明，ZVI 起两个主要作用：用作除氧剂以保持大气处于弱还原状态；用作还原剂将 Fe 3+ 还原为 Fe 2+ ，生成 Fe 1- α O 中间体。Fe 1- α O 的形成是 Si-O-Fe 形成的关键步骤。XPS 和 XRD 结果不仅提供了这一过程的证据，而且表明铁橄榄石的形成实际上是 Fe(II) 和 Si(IV) 之间的交换过程。