NiOにおけるクロム誘起酸化物相に関する第一原理からの洞察
Xiao Peng1,2, Jianmin Chen1,2, Xin Yan1,2
1School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, China. cycai@xtu.edu.cn.
Physical chemistry chemical physics : PCCP
|February 4, 2026
まとめ
Ni-Cr合金上のNiOスケールにおけるクロム(Cr)の偏析は、Cr原子のクラスター化に依存する。これらの原子メカニズムを理解することは、高温酸化抵抗を向上させる。
科学分野:
- 材料科学; 表面科学; 計算材料科学
背景:
- Ni-Cr合金の高温酸化により、複雑な酸化物スケールが形成される。; クロム(Cr)の偏析と析出物形成を理解することは、酸化抵抗を改善するための鍵である。
研究 の 目的:
- NiO表面およびバルクにおけるCr挙動の原子スケールメカニズムを調査する。; Cr配位と酸化物相進化との関連を解明する。
主な方法:
- 密度汎関数理論(DFT)計算を用いた。; NiO(100)、(110)、および(111)表面およびバルクにおけるCr挙動を調査した。
主要な成果:
- 孤立したCr原子はNiO表面に偏析し、Cr-O結合を介してNi(Cr)O固溶体を安定化させる。; Crペアおよびクラスターは、サブサーフェスに移動し、バルク内に凝集する。; これにより、NiCr2O4スピネルおよびCr2O3コランダム相の核生成が促進される。
結論:
- サイズ依存的なCr偏析メカニズムが酸化物スケール形成に影響を与える。; 原子スケールの洞察は、Ni-Cr合金の酸化抵抗を強化するための戦略を導く。
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