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北京科技大学 材料科学与工程学院, 北京市新能源材料与技术重点实验室, 北京 100083
Received:09 May 2022,
Revised:21 May 2022,
Published:05 September 2022
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宋振,刘泉林.正多面体中的晶体场劈裂[J].发光学报,2022,43(09):1428-1435.
SONG Zhen,LIU Quan-lin.Crystal-field Splitting in Regular Polyhedron[J].Chinese Journal of Luminescence,2022,43(09):1428-1435.
宋振,刘泉林.正多面体中的晶体场劈裂[J].发光学报,2022,43(09):1428-1435. DOI: 10.37188/CJL.20220190.
SONG Zhen,LIU Quan-lin.Crystal-field Splitting in Regular Polyhedron[J].Chinese Journal of Luminescence,2022,43(09):1428-1435. DOI: 10.37188/CJL.20220190.
晶体场理论是理解稀土/过渡金属离子在无机固体中能级结构的关键。对八面体场,能级表达式及图像解释发展得较为完善,但正四面体、立方体和立方八面体中的能级劈裂情况则需要进一步明确。本文根据微扰理论详细推导了单d电子在上述规则多面体中的晶体场劈裂。基于等键长的几何模型,给出了晶体场势的准确形式。随后构建了久期方程并通过对角化得到了劈裂后的能级。正四面体、八面体、立方体和立方八面体的晶体场劈裂大小分别为40
Dq
/9、90
Dq
/9、80
Dq
/9和45
Dq
/9。最后,d电子轨道与配位离子的相对取向关系有助于形象地理解e
g
/t
2g
能级在不同正多面体中的反转现象。
Crystal-field theory plays a fundamental role in understanding the energy levels of rare-earth and transition-metal elements in inorganic hosts
.
It has been fully developed for the octahedral field, both in analytical energy level expression and pictorial understanding
.
Nevertheless, the crystal field theory for other regular cubic polyhedra, including tetrahedron, cube and cuboctahedron, needs further investigation to show the similarities and differences with the octahedral field
.
In this work, the detailed crystal-field analysis of one d electron in those regular polyhedra is presented using the perturbation method
.
The exact crystal-field potentials are derived based on geometrical models with equivalent center-ligand bond length
.
The secular matrices are constructed and diagonalized to give the split energy levels
.
The crystal-field splittings for regular tetrahedron, octahedron, cube and cuboctahedron are calculated to be 40
Dq
/9, 90
Dq
/9, 80
Dq
/9 and 45
Dq
/9
.
In the end, the relative orientations between e
g
/t
2g
orbitals and the ligands are visualized to present a vivid understanding of the magnitude reverse
.
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宋振(1986 -) , 男 , 山东乳山人 , 博士 , 副教授 , 2014年于北京科技大学获得博士学位 , 主要从事固体光谱学及发光材料构效关系的研究 。. doi: 10.1016/s0925-8388(02)00056-7 http://dx.doi.org/10.1016/s0925-8388(02)00056-7
E‐mail: zsong@ustb . edu.cn . doi: 10.1016/s0925-8388(02)00056-7 http://dx.doi.org/10.1016/s0925-8388(02)00056-7
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