Creation and thermal annealing of structural defects in neutron-irradiated MgAl2O4 single crystals

A. Lushchik; S. Dolgov; E. Feldbach; R. Pareja; A. I. Popov; E. Shablonin; V. Seeman

doi:10.1016/j.nimb.2017.10.018

Creation and thermal annealing of structural defects in neutron-irradiated MgAl₂O₄ single crystals

A. Lushchik^*
, S. Dolgov
, E. Feldbach
, R. Pareja
, A. I. Popov
, E. Shablonin
, V. Seeman

^*Corresponding author for this work

Laboratory of Kinetics in Self-Organizing Systems, Institute of Solid State Physics

Research output: Contribution to journal › Article › peer-review

69 Citations (Scopus)

Abstract

Several novel hole-type defects (a hole localized at a regular oxygen ion near a negatively charged structural defect) have been revealed in fast neutron irradiated MgAl₂O₄ crystals using the EPR method. The pulse annealing of the EPR signal of these centers was compared to that of radiation induced optical absorption in the same crystals. Taking into account the determined models of V₁, V₂ and V₂₂ paramagnetic centers, the tentative scenario of the thermal annealing process of neutron-induced defects (hole-type and complementary electron F-type ones) is proposed. In addition, one more paramagnetic hole center consisting of an Al|_Mg as-grown antisite defect near an aluminum vacancy is created just by X-ray irradiation at room temperature.

Original language	English
Pages (from-to)	31-37
Number of pages	7
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	435
DOIs	https://doi.org/10.1016/j.nimb.2017.10.018
Publication status	Published - 15 Nov 2018

Keywords

EPR
Magnesium-aluminum spinel
Optical absorption
Radiation defects
Thermal annealing

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10.1016/j.nimb.2017.10.018

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title = "Creation and thermal annealing of structural defects in neutron-irradiated MgAl2O4 single crystals",

abstract = "Several novel hole-type defects (a hole localized at a regular oxygen ion near a negatively charged structural defect) have been revealed in fast neutron irradiated MgAl2O4 crystals using the EPR method. The pulse annealing of the EPR signal of these centers was compared to that of radiation induced optical absorption in the same crystals. Taking into account the determined models of V1, V2 and V22 paramagnetic centers, the tentative scenario of the thermal annealing process of neutron-induced defects (hole-type and complementary electron F-type ones) is proposed. In addition, one more paramagnetic hole center consisting of an Al|Mg as-grown antisite defect near an aluminum vacancy is created just by X-ray irradiation at room temperature.",

keywords = "EPR, Magnesium-aluminum spinel, Optical absorption, Radiation defects, Thermal annealing",

author = "A. Lushchik and S. Dolgov and E. Feldbach and R. Pareja and Popov, \{A. I.\} and E. Shablonin and V. Seeman",

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year = "2018",

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doi = "10.1016/j.nimb.2017.10.018",

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TY - JOUR

T1 - Creation and thermal annealing of structural defects in neutron-irradiated MgAl2O4 single crystals

AU - Lushchik, A.

AU - Dolgov, S.

AU - Feldbach, E.

AU - Pareja, R.

AU - Popov, A. I.

AU - Shablonin, E.

AU - Seeman, V.

PY - 2018/11/15

Y1 - 2018/11/15

N2 - Several novel hole-type defects (a hole localized at a regular oxygen ion near a negatively charged structural defect) have been revealed in fast neutron irradiated MgAl2O4 crystals using the EPR method. The pulse annealing of the EPR signal of these centers was compared to that of radiation induced optical absorption in the same crystals. Taking into account the determined models of V1, V2 and V22 paramagnetic centers, the tentative scenario of the thermal annealing process of neutron-induced defects (hole-type and complementary electron F-type ones) is proposed. In addition, one more paramagnetic hole center consisting of an Al|Mg as-grown antisite defect near an aluminum vacancy is created just by X-ray irradiation at room temperature.

AB - Several novel hole-type defects (a hole localized at a regular oxygen ion near a negatively charged structural defect) have been revealed in fast neutron irradiated MgAl2O4 crystals using the EPR method. The pulse annealing of the EPR signal of these centers was compared to that of radiation induced optical absorption in the same crystals. Taking into account the determined models of V1, V2 and V22 paramagnetic centers, the tentative scenario of the thermal annealing process of neutron-induced defects (hole-type and complementary electron F-type ones) is proposed. In addition, one more paramagnetic hole center consisting of an Al|Mg as-grown antisite defect near an aluminum vacancy is created just by X-ray irradiation at room temperature.

KW - EPR

KW - Magnesium-aluminum spinel

KW - Optical absorption

KW - Radiation defects

KW - Thermal annealing

UR - https://www.scopus.com/pages/publications/85032227779

U2 - 10.1016/j.nimb.2017.10.018

DO - 10.1016/j.nimb.2017.10.018

M3 - Article

AN - SCOPUS:85032227779

SN - 0168-583X

VL - 435

SP - 31

EP - 37

JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

ER -

Creation and thermal annealing of structural defects in neutron-irradiated MgAl₂O₄ single crystals

Abstract

Keywords

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