Vibrational modes in La2Zr2O7 pyrochlore irradiated with disparate electrical energy losses

doi:10.1088/1674-1056/ab43bf

中国物理B ›› 2019, Vol. 28 ›› Issue (11): 116102-116102.doi: 10.1088/1674-1056/ab43bf

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

Vibrational modes in La₂Zr₂O₇ pyrochlore irradiated with disparate electrical energy losses

Sheng-Xia Zhang(张胜霞), Jie Liu(刘杰), Hua Xie(谢华), Li-Jun Xu(徐丽君), Pei-Pei Hu(胡培培), Jian Zeng(曾健), Zong-Zhen Li(李宗臻), Li Liu(刘丽), Wen-Si Ai(艾文思), Peng-Fei Zhai(翟鹏飞)

1 Institute of Modern Physics, Chinese Academy of Sciences(CAS), Lanzhou 730000, China;
2 Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang 621010, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2019-07-23 修回日期:2019-09-10 出版日期:2019-11-05 发布日期:2019-11-05
通讯作者: Sheng-Xia Zhang, Jie Liu E-mail:zhangsx@impcas.ac.cn;j.liu@impcas.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11705246, 11675233, and 11690041) and the Natural Science Foundation of Gansu Province, China (Grant No. 17JR5RA316).

Vibrational modes in La₂Zr₂O₇ pyrochlore irradiated with disparate electrical energy losses

Sheng-Xia Zhang(张胜霞)¹, Jie Liu(刘杰)¹, Hua Xie(谢华)², Li-Jun Xu(徐丽君)^1,3, Pei-Pei Hu(胡培培)³, Jian Zeng(曾健)¹, Zong-Zhen Li(李宗臻)^1,3, Li Liu(刘丽)^1,3, Wen-Si Ai(艾文思)^1,3, Peng-Fei Zhai(翟鹏飞)¹

1 Institute of Modern Physics, Chinese Academy of Sciences(CAS), Lanzhou 730000, China;
2 Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang 621010, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China

Received:2019-07-23 Revised:2019-09-10 Online:2019-11-05 Published:2019-11-05
Contact: Sheng-Xia Zhang, Jie Liu E-mail:zhangsx@impcas.ac.cn;j.liu@impcas.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11705246, 11675233, and 11690041) and the Natural Science Foundation of Gansu Province, China (Grant No. 17JR5RA316).

摘要/Abstract

摘要： Polycrystalline samples of La₂Zr₂O₇ pyrochlore are irradiated by different energetic heavy ions to investigate the dependence of the vibrational mode variations on the irradiation parameters. The applied electronic energy loss (dE/dx)_e increases from about 5.2 keV/nm to 39.6 keV/nm. The ion fluence ranges from 1×10¹¹ ions/cm² to 6×10¹⁵ ions/cm². Vibrational modes of irradiated pyrochlore are analyzed by using Raman spectrum. Infrared active modes F_1u at 192, 308, and 651 cm^-1 appear in Raman spectra, and the F_2g band at 265 cm^-1 rises up due to the irradiation by 200-MeV Kr ions with (dE/dx)_e of 16.0 keV/nm. Differently, for the pyrochlore irradiated by 1750-MeV Bi ions with (dE/dx)_e of 39.6 keV/nm, in spite of the appearance of infrared active mode F_1u 651 cm^-1, the amorphous structure occurs according to the vibrational mode variations of pyrochlore irradiated at higher ion fluences. Amorphous tracks are observed in the samples, which confirm the occurrence of pyrochlore-amorphous transition in pyrochlore irradiated with (dE/dx)_e of 39.6 keV/nm.

关键词: pyrochlore, heavy ion irradiation, vibrational spectra, phase transition

Abstract: Polycrystalline samples of La₂Zr₂O₇ pyrochlore are irradiated by different energetic heavy ions to investigate the dependence of the vibrational mode variations on the irradiation parameters. The applied electronic energy loss (dE/dx)_e increases from about 5.2 keV/nm to 39.6 keV/nm. The ion fluence ranges from 1×10¹¹ ions/cm² to 6×10¹⁵ ions/cm². Vibrational modes of irradiated pyrochlore are analyzed by using Raman spectrum. Infrared active modes F_1u at 192, 308, and 651 cm^-1 appear in Raman spectra, and the F_2g band at 265 cm^-1 rises up due to the irradiation by 200-MeV Kr ions with (dE/dx)_e of 16.0 keV/nm. Differently, for the pyrochlore irradiated by 1750-MeV Bi ions with (dE/dx)_e of 39.6 keV/nm, in spite of the appearance of infrared active mode F_1u 651 cm^-1, the amorphous structure occurs according to the vibrational mode variations of pyrochlore irradiated at higher ion fluences. Amorphous tracks are observed in the samples, which confirm the occurrence of pyrochlore-amorphous transition in pyrochlore irradiated with (dE/dx)_e of 39.6 keV/nm.

Key words: pyrochlore, heavy ion irradiation, vibrational spectra, phase transition

中图分类号: (Physical radiation effects, radiation damage)

61.80.-x

61.82.-d (Radiation effects on specific materials)

张胜霞, 刘杰, 谢华, 徐丽君, 胡培培, 曾健, 李宗臻, 刘丽, 艾文思, 翟鹏飞. Vibrational modes in La₂Zr₂O₇ pyrochlore irradiated with disparate electrical energy losses[J]. 中国物理B, 2019, 28(11): 116102-116102.

Sheng-Xia Zhang(张胜霞), Jie Liu(刘杰), Hua Xie(谢华), Li-Jun Xu(徐丽君), Pei-Pei Hu(胡培培), Jian Zeng(曾健), Zong-Zhen Li(李宗臻), Li Liu(刘丽), Wen-Si Ai(艾文思), Peng-Fei Zhai(翟鹏飞). Vibrational modes in La₂Zr₂O₇ pyrochlore irradiated with disparate electrical energy losses[J]. Chin. Phys. B, 2019, 28(11): 116102-116102.

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Vibrational modes in La₂Zr₂O₇ pyrochlore irradiated with disparate electrical energy losses

Vibrational modes in La₂Zr₂O₇ pyrochlore irradiated with disparate electrical energy losses

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