Effect of high-energy electron irradiation in an electron microscope column on fluorides of alkaline earth elements (CaF _2, SrF _2, and BaF _2)

Nikolaichik V.I.; Sobolev B.P.; Zaporozhets M.A.; Avilov A.S.

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Effect of high-energy electron irradiation in an electron microscope column on fluorides of alkaline earth elements (CaF _2, SrF _2, and BaF _2)

机译：电子显微镜柱中高能电子辐照对碱土元素（CaF _2，SrF _2和BaF _2）氟化物的影响

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The effect of high-energy (150 eV) electron irradiation in an electron microscope column on crystals of fluorides of alkaline earth elements CaF _2, SrF _2, and BaF _2 is studied. During structural investigations by electron diffraction and electron microscopy, the electron irradiation causes chemical changes in MF _2 crystals such as the desorption of fluorine and the accumulation of oxygen in the irradiated area with the formation of oxide MO. The fluorine desorption rate increases significantly when the electron-beam density exceeds the threshold value of ~2 × 10 ~3 pA/cm ~2). In BaF _2 samples, the transformation of BaO into Ba(OH) _2 was observed when irradiation stopped. The renewal of irradiation is accompanied by the inverse transformation of Ba(OH) _2 into BaO. In the initial stage of irradiation of all MF _2 compounds, the oxide phase is in the single-crystal state with a lattice highly matched with the MF _2 matrix. When the irradiation dose is increased, the oxide phase passes to the polycrystalline phase. Gaseous products of MF _2 destruction (in the form of bubbles several nanometers in diameter) form a rectangular array with a period of ~20 nm in the sample.

机译：研究了电子显微镜柱中高能（150 eV）电子辐照对碱土元素CaF _2，SrF _2和BaF _2的氟化物晶体的影响。在通过电子衍射和电子显微镜进行结构研究期间，电子辐照引起MF _2晶体发生化学变化，例如氟的解吸和辐照区域中氧的积累，形成氧化物MO。当电子束密度超过阈值〜2×10〜3 pA / cm〜2时，氟的解吸速率显着增加。在BaF _2样品中，观察到停止照射后BaO转变为Ba（OH）_2的情况。 Ba（OH）_2反向转化为BaO伴随着辐照的更新。在所有MF _2化合物辐照的初始阶段，氧化物相处于单晶状态，晶格与MF _2基体高度匹配。当增加照射剂量时，氧化物相进入多晶相。 MF _2破坏的气体产物（直径为几纳米的气泡形式）形成一个矩形阵列，样品中的周期约为20 nm。

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《Crystallography reports》 |2012年第2期|共9页
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Nikolaichik V.I.; Sobolev B.P.; Zaporozhets M.A.; Avilov A.S.;
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中图分类晶体学;
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1. Effect of high-energy electron irradiation in an electron microscope column on fluorides of alkaline earth elements (CaF _2, SrF _2, and BaF _2) [J] . Nikolaichik V.I., Sobolev B.P., Zaporozhets M.A., Crystallography reports . 2012,第2期

机译：电子显微镜柱中高能电子辐照对碱土元素（CaF _2，SrF _2和BaF _2）氟化物的影响
2. Phase transitions and equations of state of alkaline earth fluorides CaF_2, SrF_2, and BaF_2 to Mbar pressures [J] . Susannah M. Dorfman, rnFuming Jiang, rnZhu Mao, Physical review . 2010,第17期

机译：碱土金属氟化物CaF_2，SrF_2和BaF_2到Mbar压力的相变和状态方程
3. Analysis of the Electronic Dipole Polarizability of Ions in Cubic Oxides, Fluorides, and Sulfides of Alkaline Earth Elements [J] . A. V. Yatsenko Crystallography reports . 2010,第4期

机译：碱土金属元素的氧化物，氟化物和硫化物中离子的电子偶极可极化性分析
4. Optical absorption of BaF2 crystals with different prehistory when irradiated by high-energy electrons [C] . E P Chinkov, S A Stepanov, V F Shtanko International Scientific Conference on Radiation-Thermal Effects and Processes in Inorganic Materials . 2016

机译：用高能电子照射时与不同预介质的BAF2晶体的光学吸收
5. Studies on photoionization and electron trapping process in rare earth codoped alkaline earth fluoride crystals. [D] . Mou, Wanfeng. 1995

机译：稀土共掺杂碱土金属氟化物晶体的光电离和电子俘获过程的研究。
6. Focused very high-energy electron beams as a novel radiotherapy modality for producing high-dose volumetric elements [O] . K. Kokurewicz, E. Brunetti, G. H. Welsh, -1

机译：聚焦非常高能量的电子束作为产生高剂量体积元素的新型放射疗法
7. Thermal and structural properties of high-energy electron irradiated poly(vinylidene fluoride-trifluoroethylene) copolymer blends [O] . Guo SS, Sun XH, Wang SX, 2005

机译：高能电子辐照聚偏二氟乙烯-三氟乙烯共聚物共混物的热和结构性能
8. Geometry and Vibrational Spectra of Alkaline-Earth Dihalides, Ii. CaF2, SrF2 and BaF2 [R] . Calder, V., Mann, D. E., Seshadri, K. S., 1969

机译：碱土金属二卤化物的几何和振动光谱，Ii。 CaF2，srF2和BaF2

Effect of high-energy electron irradiation in an electron microscope column on fluorides of alkaline earth elements (CaF _2, SrF _2, and BaF _2)

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