使用第一原则模拟,在氧酸中替代Bi(III) 的位置偏好和局部结构稳定性
Gerardo Martin Quindoza1, Yasuhiro Nakagawa1, Hayato Laurence Mizuno1,2
1Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan. tikoma@ceram.titech.ac.jp.
(Bi) 离子优先替代酸 (HAp) 中的Ca2) 位点,导致结构变化. 这种基本的理解对于为各种应用量身定制HAp属性至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 计算材料科学科学 计算材料科学
背景情况:
- 在酸 (HAp) 中替代 (Bi) 石 (III) 赋予了宝贵的特性,如抗菌和催化活性,同时保持生物活性.
- 精确了解Bi(III) 替代行为,包括HAp网格内的位置偏好和结构稳定性,对于材料优化至关重要,但仍然不完整.
研究的目的:
- 通过第一原则模拟,研究酸 (HAp) 格子内的Bi(III) 离子的替换行为.
- 确定Bi(III) 替代的首选位置,并分析HAp.中由此产生的局部结构变化.
主要方法:
- 采用基于密度函数理论 (DFT) 的第一原则模拟来模拟HAp中的Bi (III) 替代.
- 进行了能源计算,以确定Bi (III) 离子的位置偏好.
- 分析了当地结构变化,包括债券人口和协调号码.
主要成果:
- 能量计算表明,Ca2) 位点被Bi) 离子优先占用,每原子的能量差异约为0.02 eV.
- 局部结构分析揭示了结合群值的增加和氧气协调的转移,从7到6在Ca2位点.
- 这些变化归因于增强的共价相互作用和Ca2位点对庞大的Bi3离子及其孤独对的适应性.
结论:
- 乙 (III) 离子优先替代HAp网格中的Ca2位点.
- 这种替代引发了由于电子和硬质因素造成的显著局部结构变化.
- 提供了第一个全面的第一原则基于模拟的研究Bi(III) 替代站点偏好在HAp.
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