Xinlei Zhang,Bin-Bin Zhang,Xiao Ma,Maosen Fu,Gangqiang Zha,Wanqi Jie
Irradiation damage in halide perovskites usually enhances ion migration, decomposition, formation of intermediate phases, etc., which further decrease the working stability of halide perovskite optoelectronic devices. For example, due to the beam-sensitive nature of halide perovskites, the artifact information about local structures and microstructures is difficult to avoid during transmission electron microscopy (TEM) characterization. The interaction mechanism between high-energy electron beams and halide perovskites is still unclear. In this work, the electron-beam irradiation effect on solution-grown halide double perovskite Cs2AgBiBr6 crystals was systematically investigated by TEM. Depending on the different orientations of Cs2AgBiBr6, two kinds of electron beam irradiation damage were observed. When the irradiation on Cs2AgBiBr6 is along the [110]pc zone axis, a new phase Cs2Ag0.5BiBr6 with a vacancy-ordered superstructure forms, which is attributed to the “knock-on displacement” mechanism. In contrast, when the electron beams are along the [111]pc zone axis of Cs2AgBiBr6, an amorphous phase is gradually generated due to the “radiolysis” mechanism. Our finding clearly reveals the characteristics of irradiation damage in representative halide perovskites and further provides a new understanding of the working instability of halide perovskite optoelectronic devices.
Xiaoyan Shu,Long Fan,Yi Xie,Weidong Zhu,Sheqi Pan,Yi Ding,Fangting Chi,Yanlin Wu,Xirui Lu
It is necessary to study the self-irradiation effects of nuclear waste forms under α-decay in the long term storage. In the present work, accelerated irradiation experiments were performed on (Gd 1-4 x U 2 x ) 2 (Zr 1- x U x ) 2 O 7 ( x = 0, 0.10, 0.14) samples using 0.5 MeV alpha-particle irradiation at fluences ranging from 1 × 10 14 to 1 × 10 17 ions/cm 2 at room temperature . Irradiation induced microstructural evolution was examined by grazing incidence X-ray diffraction (GIXRD), Raman spectroscopy and Field-emission scanning electron microscopy (FESEM). The results show that the main crystal structure is kept, however, weaker structural ordering is leaded as a result of intensified irradiation. And the radiation resistance is enhanced by the growing uranium content in the discussed range. Moreover, the irradiation effects as a function of depth have been discussed. Raman spectra reveal that the vibration intensity of atomic bonds are changed due to increased irradiation. In addition, the microtopography and element distribution have been kept after irradiation.
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