Synthesis of medium entropy Mn1.56Co0.96Ni0.48O4 films by solid-state reaction

Wei, Jiahao; Ren, Wei; Lü, Heng; Yao, Guoguang; Zhu, Ying; Zhao, Dong-Xing; Shi, Qiwu; Wang, Jiafu; Tian, Ding; Zhang, Bo-Yu

doi:10.1016/j.jssc.2021.122742

Cited by 4 publications

(1 citation statement)

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“…This process leads to the creation of a single-phase spinel solid solution, inevitably leading to modifications in the material's microstructure and solid solution mechanism, which profoundly impact its optical and electrical properties (Teichmann and Töpfer, 2022). Furthermore, the high entropy effect suggests that the combination of multiple elements can yield specific synergistic outcomes, occasionally resulting in unexpected effects (Wei et al, 2022). Therefore, comprehending these underlying control mechanisms can effectively optimize the performance of such high-entropy ceramic materials and expand their range of applications.…”

Section: Introductionmentioning

confidence: 99%

Modulation of optical absorption and electrical properties in Mn-Co-Ni-O-based high-entropy thin films

2023

Front. Mater.

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High-entropy thin films of Mn0.6Co0.6Ni0.6Mg0.6Cu0.6O4, Mn0.6Co0.6Ni0.6Mg0.6 Zn0.6O4, and Mn0.6Co0.6Ni0.6Cu0.6Zn0.6O4 (MCNMC, MCNMZ, and MCNCZ) with equiatomic proportions were synthesized using chemical solution deposition on silicon substrates. Structural analysis confirmed a consistent face-centered cubic spinel structure, while significant differences in surface morphology were observed. Quantification of the valence states of Mn ions revealed an inverse variation in the concentrations of Mn4+ and Mn2+ ions. The heightened infrared light absorption of the MCNMC thin film was assigned to Cu-induced Jahn-Teller distortion and highly polarized Mg-O bonds. All samples exhibited negative temperature coefficient behaviors in their electrical properties. Additionally, the MCNMC thin film demonstrated the lowest resistance due to its denser microstructure, close proximity of Mn3+/Mn4+ ion concentrations, and additional Cu+/Cu2+ ion pairs, enhancing small polaron hopping conductivity. In contrast, the MCNMZ thin film showed moderate resistance but boasted the highest thermal constant (B25/50) of 3768 K, attributed to its distinctive grain chain structure, facilitating carrier transport while introducing migration barriers.

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Section: Introductionmentioning

confidence: 99%