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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Transmission electron microscopy experiments have been performed to investigate the lattice damage created by heavy-ion bombardments in GaAs. These experiments have been performed in situ by using the HVEM - Ion Accelerator Facility at Argonne National Laboratory. The ion bombardments (50 keV Ar and Kr) and the microscopy have been carried out at temperatures ranging from 30 to 300°K. Ion fluences ranged from 2 x 1011 to 5 x 1013 ions cm−2. Direct-impact amorphization is observed to occur in both n-type and semi-insulating GaAs irradiated to low ion doses at 30°K and room temperature. The probability of forming a visible defect is higher for low temperature irradiations than for room temperature irradiations. The amorphous zones formed at low temperature are stable to temperatures above 250°K. Post-implantation annealing is seen to occur at room temperature for all samples irradiated to low doses until eventually all visible damage disappears. 14 refs., 3 figs., 1 tab.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Transmission electron microscopy experiments have been performed to investigate the lattice damage created by heavy-ion bombardments in GaAs. These experiments have been performed in situ by using the HVEM - Ion Accelerator Facility at Argonne National Laboratory. The ion bombardments (50 keV Ar and Kr) and the microscopy have been carried out at temperatures ranging from 30 to 300°K. Ion fluences ranged from 2 x 1011 to 5 x 1013 ions cm−2. Direct-impact amorphization is observed to occur in both n-type and semi-insulating GaAs irradiated to low ion doses at 30°K and room temperature. The probability of forming a visible defect is higher for low temperature irradiations than for room temperature irradiations. The amorphous zones formed at low temperature are stable to temperatures above 250°K. Post-implantation annealing is seen to occur at room temperature for all samples irradiated to low doses until eventually all visible damage disappears. 14 refs., 3 figs., 1 tab.
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 380
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Simon A. Redfern Publisher: Walter de Gruyter GmbH & Co KG ISBN: 1501509152 Category : Science Languages : en Pages : 372
Book Description
Volume 39 of Reviews in Mineralogy and Geochemistry about Transformation Processes in Minerals summarises the current state of the art. The selection of transformation processes covered here is by no means comprehensive, but represents a coherent view of some of the most important processes which occur specifically in minerals. Contents: Rigid unit modes in framework structures Strain and elasticity at structural phase transitions in minerals Mesoscopic twin patterns in ferroelastic and co-elastic minerals High-pressure structural phase transitions Order-disorder phase transitions Phase transformations induced by solid solution Magnetic transitions in minerals NMR spectroscopy of phase transitions in minerals Insights into phase transformations from Mössbauer spectroscopy Hard mode spectroscopy of phase transitions Synchrotron studies of phase transformations Radiation-induced amorphization
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Author: Simon A. Redfern
Author: Michael J. Aziz