期刊
CHINESE PHYSICS B
卷 28, 期 11, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1674-1056/ab43bf
关键词
pyrochlore; heavy ion irradiation; vibrational spectra; phase transition
资金
- National Natural Science Foundation of China [11705246, 11675233, 11690041]
- Natural Science Foundation of Gansu Province, China [17JR5RA316]
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 & xfffd; 10(11) ions/cm(2) to 6 & xfffd; 10(15) ions/cm(2). 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.
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