Scientific Achievement: Neutron diffraction and x-ray spectroscopies showed that fine-tuning oxygen content using metal oxalate precursors and MnO2 as oxygen generator stabilizes divalent iron and manganese in a rock-salt high entropy oxide (HEO).
Significance and Impact: Demonstrating the stability of divalent Fe in a rock-salt HEO provides a pathway toward novel crystalline materials with targeted cation disorder.
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