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Issue 4, 2019
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Overcoming synthetic metastabilities and revealing metal-to-insulator transition & thermistor bi-functionalities for d-band correlation perovskite nickelates

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Abstract

Effective synthesis of meta-stable materials challenging the thermodynamic limits will play a significant role in broadening the horizon in material designs and further explorations of their functionalities. Although d-band correlated rare-earth nickelate perovskites (ReNiO3) have achieved promising applications, e.g., metal-to-insulator transition, artificial intelligence, and memory/logical devices, the thermodynamic instability and high vacuum-dependence in material synthesis have largely caused bottlenecks in these applications. Herein we demonstrate a vacuum-free and low cost chemical route to effectively synthesize single-crystalline ReNiO3 thin films that further promote their device applications. It achieves high flexibility and convenience by adjusting the A-site compositions within the perovskites via single (i.e. Nd, Sm, Eu, and Gd), binary (i.e., Sm1−xNdx and Sm1−xEux) and triple (i.e. Sm1−xyNdxEuy and Sm1−xyNdxGdy) rare-earth elements. The respective regulations in electronic structures, as probed via near edge X-ray absorption fine structure analysis, result in sharper metal-to-insulator transitions within a broad temperature range of 400 K, compared with their reported performances. Furthermore, we discover an overlooked thermistor transport behavior of ReNiO3 within the binary A-site elements, which exhibits large temperature coefficients of resistance (>2%) across a broad range of temperatures (5–470 K). By overcoming the bottlenecks in material synthesis of ReNiO3, the present work profoundly paves the way for device fabrication.

Graphical abstract: Overcoming synthetic metastabilities and revealing metal-to-insulator transition & thermistor bi-functionalities for d-band correlation perovskite nickelates

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Publication details

The article was received on 03 Jan 2019, accepted on 14 Jan 2019 and first published on 14 Jan 2019


Article type: Communication
DOI: 10.1039/C9MH00008A
Mater. Horiz., 2019,6, 788-795

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    Overcoming synthetic metastabilities and revealing metal-to-insulator transition & thermistor bi-functionalities for d-band correlation perovskite nickelates

    J. Chen, H. Hu, J. Wang, T. Yajima, B. Ge, X. Ke, H. Dong, Y. Jiang and N. Chen, Mater. Horiz., 2019, 6, 788
    DOI: 10.1039/C9MH00008A

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