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Updated: Jul 20, 2025
Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
Published on: October 27, 2018
关于Gd-doped HfO2和DFT计算中的正方体相稳定源的全面研究
D Banerjee1,2, C C Dey3,2, Ravi Kumar4
1Radiochemistry Division (BARC), Variable Energy Cyclotron Centre, Kolkata 700064, India. dbanerjee@vecc.gov.in.
这项研究稳定了氧化物 (HfO2) 在散装多晶材料中的极性和非极性正交相,使用了加多兴奋剂. 这些发现强调了溶解物阻力效应在稳定这些铁电相中的作用.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 纳米技术 纳米技术
背景情况:
- 超薄的氧化哈夫 (HfO2) 薄膜表现出与极端正方体 (o) 阶段 (空间组Pca21) 相关的铁电 (FE).
- 稳定这种O相在化薄膜中对于FE应用至关重要.
- 了解多剂对大量HfO2相稳定性的作用是必不可少的.
研究的目的:
- 在散装多晶材料中稳定HfO2的极性和非极性形相.
- 调查加多 (Gd) 兴奋剂度在相位稳定中的作用.
- 阐明O相核化和稳定背后的机制.
主要方法:
- 瑞特维尔德对X射线衍射 (XRD) 数据的分析,以确定相位群.
- 时间差扰角相关 (TDPAC) 光谱,X射线近边结构 (XANES) 和扩展的X射线吸收细结构 (EXAFS) 用于本地环境分析.
- 场辐射扫描电子显微镜 (FESEM) 和传输电子显微镜 (TEM) 用于微观结构分析.
- 密度函数理论 (DFT) 用于缺陷形成能量计算.
主要成果:
- 稳定HfO2的极性和非极性o相,在Gd化散装多晶HfO2中.
- 与单临床 (m) 阶段并存的O阶段的相对人口增加,具有更高的Gd含量.
- Gd-doping导致颗粒大小减少,这归因于溶液阻力效应.
- 在谷物边界的Gd分离在热力学上是有利的,促进了O相核形成.
结论:
- 在大量的HfO2.2.中,Gd-doping有效地稳定了极性和非极性正极相.
- 溶液阻力效应和粒度边界的Gd分离是O相稳定的主要机制.
- 这些发现支持HfO2在铁电设备中的未来应用,并提供了对剂诱导的相位稳定性的见解.
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