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3D Residual Strain in DKDP Crystals by Neutron Diffraction
Author(s) -
Liu Fafu,
Sun Xun,
Sun Guangai,
Cao Jianwu,
Mu Xiaoming,
Guo Zaizai,
Yuan Qingxi
Publication year - 2019
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201900022
Subject(s) - neutron diffraction , strain (injury) , deuterium , crystallography , crystal (programming language) , diffraction , residual , neutron , chemistry , materials science , crystal structure , physics , optics , atomic physics , nuclear physics , mathematics , medicine , algorithm , computer science , programming language
Neutron diffraction technique is applied to study the three‐dimensional (3D) residual strains in K(H 1− x D x ) 2 PO 4 (DKDP) crystals with various deuterium contents (0 ≤ x ≤ 0.99). It is found that the residual strains in the crystalline coordinate are at the magnitude of 10 −3 to 10 −4 . The results show that the level of the macro‐strain in the crystal bulk is independent of the deuteration level. However, when the deuteration level is below 50%, the average of micro‐strain increases first with the increasing of deuteration level, then decreases when the deuteration level is in excess of 50%. According to the residual strains, the internal stresses are calculated through σ ij = C ijkl ε kl . Finally, the potential sources of the stresses in crystals are discussed and analyzed.