Entropy‐stabilized transition metal oxides ([MgNiCoCuZn]O) (ESO) in recent years have received considerable attention owing to their unique functional properties. Solution combustion and solid state syntheses resulted in crystallites varying from 5‐15 nm to 3‐5 μm respectively. Phase stability studies showed that all the systems containing Cu²⁺ ions in the ESO lattice segregated upon slow cooling in the furnace. It was only when ESO was quenched in air from 1000°C the lattice stabilized to a single phase. Experiments concomitant with molecular dynamics (MD) simulations demonstrated that the local stress fields around the cations played a critical role in stabilizing the single phase. The local stress fields are a result of Jahn‐Teller distortion induced by the Cu²⁺ ions in the lattice. It is clearly established that in the absence of the minimization of the local stress fields around the Cu²⁺ ions, segregation leading to the formation of a multi‐phase material is imminent for this particular composition.

中文翻译：

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阳离子局部应力对熵稳定过渡金属氧化物稳定的关键作用

熵稳定的过渡金属氧化物（[MgNiCoCuZn] O）（ESO）近年来因其独特的功能特性而受到了广泛的关注。固溶燃烧和固态合成产生的微晶分别在5-15 nm至3-5μm之间变化。相稳定性研究表明，在炉中缓慢冷却后，ESO晶格中所有包含Cu ²⁺离子的系统都会分离。只有当ESO在1000°C的空气中淬火后，晶格才会稳定为单相。伴随分子动力学（MD）模拟的实验表明，阳离子周围的局部应力场在稳定单相中起关键作用。局部应力场是由Cu ²⁺引起的Jahn-Teller变形的结果离子在晶格中。显然可以确定的是，在这种情况下，在Cu ²⁺离子周围的局部应力场没有最小化的情况下，导致多相材料形成的偏析迫在眉睫。