1 School of Medical Information Engineering, Shenyang Medical College, Shenyang 110034, China; 2 State Key Laboratory of High Pressure and Superhard Materials, Jilin University, Changchun 130012, China; 3 School of Science, Shenyang Ligong University, Shenyang 110159, China; 4 Spallation Neutron Source Science Center, Dongguan 523803, China
Abstract The structural phase transition of MnO nanorods was investigated using in situ high pressure synchrotron x-ray diffraction (XRD) and transmission electron microscopy (TEM). At pressures exceeding 10.9 GPa, a second-order structural phase transition from tetragonal to orthogonal, which was accompanied by fine-scale crystal twinning phenomena, was observed in MnO nanorods. On account of the significant contribution of surface energy, the phase transition pressure exhibited appreciable hysteresis compared with the bulk counterparts, suggesting the enhanced structural stability of nanorod morphology. These findings reveal that the size and morphology exhibit a manifest correlation with the high pressure behavior of MnO nanomaterials, providing useful insights into the intricate interplay between structure and properties.
Fund: We would like to thank Beijing Synchrotron Radiation Facility technical support groups. Project supported by China Postdoctoral Science Foundation (Grant No. 2023M742049), Guangdong Basic and Applied Basic Research Foundation (Grant No. 2023A1515110844), and the Innovative Training Program for College Students (Grant No. 20249076).
Corresponding Authors:
Zong-Lun Li
E-mail: lizl20@mails.jlu.edu.cn
Cite this article:
Xue-Ting Zhang(张雪婷), Chen-Yi Li(李晨一), Hui Tian(田辉), Xin-Yue Wang(王心悦), Zong-Lun Li(李宗伦), and Quan-Jun Li(李全军) Morphology-tuned phase transition of MnO2 nanorods under high pressure 2025 Chin. Phys. B 34 066105
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