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Irradiation-induced disordering and amorphization of Al<sub>3</sub>Ti-based intermetallic compounds
Park, Jeong-Yong,Kim, Il-Hyun,Motta, Arthur T.,Ulmer, Christopher J.,Kirk Jr., Marquis A.,Ryan Jr., Edward A.,Baldo Jr., Peter M. Elsevier 2015 JOURNAL OF NUCLEAR MATERIALS Vol.467 No.2
<P><B>Abstract</B></P> <P>An in situ ion-irradiation study, simultaneously examined using transmission electron microscopy, was performed to investigate irradiation-induced disordering and amorphization of Al<SUB>3</SUB>Ti-based intermetallic compounds. Thin foil samples of two crystalline structures: D0<SUB>22</SUB>-structured Al<SUB>3</SUB>Ti and L1<SUB>2</SUB>-structured (Al,Cr)<SUB>3</SUB>Ti were irradiated using 1.0 MeV Kr ions at a temperature range from 40 K to 573 K to doses up to 4.06 × 10<SUP>15</SUP> ions/cm<SUP>2</SUP>. The results showed that both the compounds underwent an order-disorder transformation under irradiation, where both Al<SUB>3</SUB>Ti and (Al,Cr)<SUB>3</SUB>Ti ordered structures were fully transformed to the disordered face-centered cubic (FCC) structure except at the highest irradiation temperature of 573 K. A slightly higher irradiation dose was required for order-disorder transformation in case of Al<SUB>3</SUB>Ti as compared to (Al,Cr)<SUB>3</SUB>Ti at a given temperature. However, their amorphization resistances were different: while the disordered FCC (Al,Cr)<SUB>3</SUB>Ti amorphized at the irradiation dose of 6.25 × 10<SUP>14</SUP> ions/cm<SUP>2</SUP> (0.92 dpa) at 40 K and 100 K, the Al<SUB>3</SUB>Ti compound with the same disordered FCC structure maintained crystallinity up to 4.06 × 10<SUP>15</SUP> ions/cm<SUP>2</SUP> (5.62 dpa) at 40 K. The critical temperature for amorphization of (Al,Cr)<SUB>3</SUB>Ti under Kr ion irradiation is likely between 100 K and room temperature and the critical temperature for disordering between room temperature and 573 K.</P>
Phillip A. Alviola,Marnelli S. Alviola,Kirk J. Taray,Cristian C. Lucañas,Anna Pauline O. de Guia,Aimee Lynn B. Dupo,Virginia C. Cuevas,Nelson M. Pampolina,Ireneo L. Lit Jr. 국립중앙과학관 2023 Journal of Asia-Pacific Biodiversity Vol.16 No.3
Food habits of eight insectivorous bat species from Puting Bato Cave Complex, Polillo Island, wereexamined. Fecal samples collected from eight species of cave-dwelling insectivorous bats containedculled fragments from seven prey taxa (six insect orders and one fish prey). Lepidoptera, Coleoptera, andHymenoptera were the most consumed group in both percentage volume and percentage frequency. Thediet of Hipposideros diadema, H. pygmaeus, Rhinolophus arcuatus, and R. philippinensis mostly concurswith previous studies but with varying proportions. Baseline information on the diets of H. coronatus,M. paululus, R. macrotis, and R. rufus is provided in this study.