Letter: Ion irradiation of the TiO2 polymorphs and cassiterite
Letter: Ion irradiation of the TiO2 polymorphs and cassiterite
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信件：TiO2 多晶型物和锡石的离子辐照
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
P. Baldo
中科院分区：
文献类型：
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作者：
G. Lumpkin;M. Blackford;Katherine L. Smith;K. Whittle;N. Zaluzec;E. Ryan;P. Baldo
用1.0MeV的Kr离子在50-300 K温度下对金红石、板钛矿、金红石和绿柱石的薄晶体进行了原位辐照。含0.1- 0.2wt%杂质的人造金红石和天然水辉石在50 K时，在高达5 × 1015 ions cm-2的能量密度下仍保持结晶状态，无非晶化迹象。含0.3- 0.5wt%杂质的天然板钛矿和铌酸锂分别在8.1 × 10 ~（14）和2.3 × 10 ~（14）离子cm ~（-2）的注量下变为非晶态。我们还研究了两个天然金红石样品含有~1.7和1.2重量%的杂质。这些样品在50 K下分别在9.2 × 1014和8.6 × 1014离子cm-2处变为非晶。对天然板钛矿、金红石和金红石的注量-温度数据的进一步分析给出了临界非晶化温度分别为168 ± 11、209 ± 8和242 ± 6 K。结果进行了简要的讨论，就几个标准的抗辐射性，包括方面的结构，键合，和能量的缺陷形成和迁移。
Abstract Thin crystals of rutile, brookite, anatase, and cassiterite were irradiated in situ in the transmission electron microscope using 1.0 MeV Kr ions at 50-300 K. Synthetic rutile and natural cassiterite, with 0.1-0.2 wt% impurities, remain crystalline up to a fluence of 5 × 1015 ions cm-2 without evidence for amorphization at 50 K. Natural brookite and anatase, with 0.3-0.5 wt% impurities, become amorphous at fluences of 8.1 × 1014 and 2.3 × 1014 ions cm-2, respectively. We have also studied two natural rutile samples containing ~1.7 and 1.2 wt% impurities. These samples became amorphous at 9.2 × 1014 and 8.6 × 1014 ions cm-2 at 50 K, respectively. Further analyses of the fluence-temperature data for natural brookite, rutile, and anatase give critical amorphization temperatures of 168 ± 11, 209 ± 8, and 242 ± 6 K, respectively. Results are briefly discussed with respect to several criteria for radiation resistance, including aspects of the structure, bonding, and energetics of defect formation and migration.