在Mn2+中的确定性结构扭曲 - - 化层状混合化矿矿矿单晶
Pushpender Yadav1, Kyeongdeuk Moon1, Muhammad Shoaib1
1Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States.
ACS nano
|July 17, 2025
概括
在化单晶中稀释磁性兴奋剂会导致显著的结构扭曲. 这种受控的晶体变形,由热力学收益驱动,是设计先进的基于旋转的技术的关键.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 半导体物理 半导体物理
背景情况:
- 在宽带间隙半导体中稀释磁性兴奋剂为新的光学和自旋特性提供了潜力.
- 了解高质量单晶中的剂诱导的结构变化至关重要,但尚未得到充分研究.
研究的目的:
- 为了研究Mn2+化 (BA) 2PbBr4单晶中的结构变化,作为Mn2+度的函数.
- 阐明剂诱导的结构扭曲背后的驱动力,并确认Mn2+的纳入.
主要方法:
- 合成Mn2+合 (BA) 2PbBr4单晶,含有控制的Mn2+含量.
- 使用X射线衍射和显微镜进行结构分析,以量化晶体变形.
- 密度函数理论 (DFT) 计算以建模热力学稳定性.
- 光发光光谱学,电子磁共振 (EPR) 和超导量子干扰装置 (SQUID) 测量以确认Mn2+的结合和特性.
主要成果:
- 观察到显著的晶体变形,包括在4.95%的Mn2+度下在平面内发生剪切扭曲 (高达~6°) 和在平面外发生收缩 (9.7%).
- DFT的计算证实了结构扭曲是由热力学能量增益驱动的.
- 通过特征性的600nm发射,~0.3ms辐射寿命,EPR超精细结构和偏磁响应确认了成功的Mn2+整合.
结论:
- 用Mn2+进行兴奋剂诱导 (BA) 2PbBr4单晶的结构变化比通常观察到的要大得多.
- 观察到的结构扭曲在热力学上是有利的,为dopant-host相互作用提供了洞察力.
- 这些发现支持用于先进的基于旋转的信息技术的稀释磁性半导体的合理设计.
关键词:
拉德尔斯登 - 波普尔矿石 (Ruddlesden-Popper perovskite) 是一种矿石.化学蒸气沉积 化学蒸气沉积扭曲的扭曲是一种扭曲.兴奋剂的使用 兴奋剂的使用纳米板块是一种纳米板块.这是一种偏磁性磁体.更多相关视频
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