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arXiv 2106.13615cond-mat.mtrl-sci
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Mn离子在PbTiO $_{3}$中的位置和价态

Mn ions' site and valence in PbTiO$_{3}$ based on the native vacancy defects

H. Xin, Q. Pang, D. L. Gao, L. Li, P. Zhang, J. Zhao

摘要:

采用第一性原理计算研究了Mn离子在PbTiO $_{3}$(PT)中的掺杂位置和价态。首先,研究了PT中Pb、O和Ti的本征空位缺陷,发现Pb空位比其它空位更易产生。在平衡条件下,当Pb不足时,Mn掺杂PT的生长应优先于Mn离子取代+3价的A位Pb离子,这可能导致PT的较大晶格畸变。另外,Mn离子进入Pb位后,O的电负性变弱,使PT中的畴运动更容易,从而提高PT的性能,而Mn离子取代B位Ti离子则相反。

英文摘要:

Mn ions' doping site and valence were studied in PbTiO$_{3}$ (PT) with the native vacancy defects by the first-principles calculations. Firstly, the native vacancy defects of Pb, O and Ti in PT were investigated and it was found that Pb vacancy is preferred to others. And then the growth of Mn doped PT should be preferred to Mn ion substituting for an A-site Pb ion with +3 valence when Pb is deficient under equilibrium conditions driven solely by minimization of the formation energy, and this could result in a larger lattice distortion of PT. In addition, when Mn enters the Pb site, the electronegativity of O becomes weaker which makes the domain movement easier in PT to improve the performance of PT, while Mn ion substitution for a B-site Ti ion is the opposite.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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