期刊
MATERIALS
卷 12, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/ma12010100
关键词
lithium niobate; spontaneous polarization; dipole moment; defects
类别
资金
- National Natural Science Foundation of China [11674179, 61705116]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_13R29]
Numerous studies have indicated that intrinsic defects in lithium niobate (LN) dominate its physical properties. In an Nb-rich environment, the structure that consists of a niobium anti-site with four lithium vacancies is considered the most stable structure. Based on the density functional theory (DFT), the specific configuration of the four lithium vacancies of LN were explored. The results indicated the most stable structure consisted of two lithium vacancies as the first neighbors and the other two as the second nearest neighbors of Nb anti-site in pure LN, and a similar stable structure was found in the doped LN. We found that the defects dipole moment has no direct contribution to the crystal polarization. Spontaneous polarization is more likely due to the lattice distortion of the crystal. This was verified in the defects structure of Mg2+, Sc3+, and Zr4+ doped LN. The conclusion provides a new understanding about the relationship between defect clusters and crystal polarization.
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