Microstructure and structural modulation of lutetium dihydride LuH2 as seen via transmission electron microscopy

Structural investigations conducted using transmission electron microscopy (TEM) on LuH2 synthesized under atmospheric pressure (AP-LuH2) and nitrogen-doped LuH2 synthesized under high pressure (HP-LuH2) have revealed numerous microstructural phenomena. Both materials show a clear superstructure mod...

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Published inarXiv.org
Main Authors Xiao-Ping, Ma, Ning-Ning, Wang, Wen-Tao, Wang, Jing-Zhe Nie, Wen-Li, Gao, Sun, Shuai-Shuai, Li, Jun, Huan-Fang, Tian, Tian-Long, Xia, Jin-Guang Cheng, Jian-Qi, Li, Yang, Huai-Xin
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 26.09.2023
Subjects
Antiphase boundaries
Dihydrides
Domain walls
Interfacial properties
Lutetium
Microstructure
Modulation
Nitrogen
Phase transitions
Superstructures
Synthesis
Thickness
Transmission electron microscopy
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Summary:Structural investigations conducted using transmission electron microscopy (TEM) on LuH2 synthesized under atmospheric pressure (AP-LuH2) and nitrogen-doped LuH2 synthesized under high pressure (HP-LuH2) have revealed numerous microstructural phenomena. Both materials show a clear superstructure modulation with wave vector, q^* = 1/4 (2-20), and this modulation can be well interpreted by the displacements of Lu atoms. Further investigations on the nitrogen-doped HP-LuH2 materials reveal the appearance of high-density antiphase boundaries, in particular, domain walls of a few atomic layer thickness without structural modulation can be observed, suggesting possible interface properties could be detected in this system. In-situ TEM observations of AP-LuH2 suggest that no evident structural phase transition occurs between 94 K and 673 K.
ISSN:2331-8422