分子网络在机械激活化中的多态性 在偏离As2Se3Stoichiometry的情况下
Oleh Shpotyuk1,2, Zdenka Lukáčová Bujňáková3, Peter Baláž3
1Institute of Physics, Jan Dlugosz University in Częstochowa, 13/15, al. Armii Krajowej, 42-200 Częstochowa, Poland.
Molecules (Basel, Switzerland)
|February 13, 2025
概括
高能机械削会在色化物玻璃合金中诱导多态转变. 这些转变改变了中距离结构,含量增加增强了重形化阶段过渡.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 化学物理 化学物理
背景情况:
- 多态性,即多种无形相的存在,是玻璃合金中的一个关键现象.
- 色化物玻璃,特别是那些偏离As2Se3固态度的玻璃,表现出复杂的结构行为.
- 了解机械应力下的结构转变对于开发先进材料至关重要.
研究的目的:
- 通过高能机械研磨 (纳米研磨) 诱导的As4Sen型玻璃合金中的多态转换的研究.
- 阐明中程结构变化及其与组成和分子性的相关性.
- 开发一种经过修改的微晶模型,用于解释纳米造驱动的结构反应.
主要方法:
- 炼火以制备玻璃性合金 (g-As4Se5,g-As4Se4). 这种炼方法可用于制备玻璃性合金.
- 高能机械削 (纳米削) 以诱导结构转变.
- 多实验方法:粉末X射线衍射 (XRD),热物理传热,微拉曼散射 (micro-RS) 和正子灭绝寿命 (PAL) 光谱.
- 使用CINCA进行微结构分析的量子化学建模.
主要成果:
- 纳米造驱动了色化玻璃中的多态转换,改变了中距离的顺序.
- 修改后的微晶模型成功地解释了XRD模式,区分了网络和分子贡献.
- 由于分子性增加,含量增加 (接近g-As4Se4) 增强了重新形态化 (无形I到无形II) 过渡.
- 热量测量和微RS反应显示g-As4Se5的轻微变化,通过PAL光谱学观察到空白的正子捕获减少.
结论:
- 纳米是一种有效的方法,用于诱导色化玻璃中的多态转换.
- 对纳米加工的结构反应涉及中介范围订单中断和增强的长距离订单之间的相互作用.
- 该研究为了解这些材料的多态性提供了一个框架,将结构变化与组成和分子特征联系起来.
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