Optical absorption and Raman studies of neutron-irradiated Gd3Ga5O12 single crystals

N. Mironova-Ulmane; I. Sildos; E. Vasil'chenko; G. Chikvaidze; V. Skvortsova; A. Kareiva; J. E. Muñoz-Santiuste; R. Pareja; E. Elsts; A. I. Popov

doi:10.1016/j.nimb.2018.02.006

Optical absorption and Raman studies of neutron-irradiated Gd₃Ga₅O₁₂ single crystals

N. Mironova-Ulmane^*
, I. Sildos
, E. Vasil'chenko
, G. Chikvaidze
, V. Skvortsova
, A. Kareiva
, J. E. Muñoz-Santiuste
, R. Pareja
, E. Elsts
, A. I. Popov

^*Corresponding author for this work

University of Tartu
Vilnius University
Universidad Carlos III de Madrid
Institut Laue-Langevin

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

30 Citations (Scopus)

Abstract

In this work we have performed a comparative analysis of optical absorption and micro-Raman spectra for series of Gd₃Ga₅O₁₂ (GGG) single crystals irradiated by fast neutrons with fluences from 10¹⁶ n/cm² to 10¹⁸ n/cm². It was found that the optical absorption spectra of non-irradiated Czochralski grown GGG consist of the relatively narrow lines in the UV spectral range related to the 4f–4f transitions in Gd³⁺. Transitions from the ⁶S_7/2 ground state to the ⁶P, ⁶J and ⁶D states in a Gd³⁺ cation are clearly detected. For a GGG crystal containing Ca impurity ions, additional absorption band at 350 nm is observed, and it is tentatively ascribed to oxygen vacancies associated with Ca impurities. Several neutron-induced optical absorption bands, including ones related to F⁺ centres, were observed in fast neutron-irradiated Gd₃Ga₅O₁₂ single crystals. Furthermore, clear evolution of the Raman spectra with neutron dose is also found. In particular, fine structure observed between 1350 and 1550 cm⁻¹ is completely disappeared at high fluences, while several significant changes and the emergence of new transitions have been ascertained in spectral range of 100–850 cm⁻¹.

Original language	English
Pages (from-to)	306-312
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.2018.02.006
Publication status	Published - 15 Nov 2018

Keywords

GdGaO
Neutron irradiation
Optical absorption
Radiation defects
Raman
Thermal annealing

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10.1016/j.nimb.2018.02.006

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Mironova-Ulmane, N., Sildos, I., Vasil'chenko, E., Chikvaidze, G., Skvortsova, V., Kareiva, A., Muñoz-Santiuste, J. E., Pareja, R., Elsts, E., & Popov, A. I. (2018). Optical absorption and Raman studies of neutron-irradiated Gd₃Ga₅O₁₂ single crystals. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 435, 306-312. https://doi.org/10.1016/j.nimb.2018.02.006

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title = "Optical absorption and Raman studies of neutron-irradiated Gd3Ga5O12 single crystals",

abstract = "In this work we have performed a comparative analysis of optical absorption and micro-Raman spectra for series of Gd3Ga5O12 (GGG) single crystals irradiated by fast neutrons with fluences from 1016 n/cm2 to 1018 n/cm2. It was found that the optical absorption spectra of non-irradiated Czochralski grown GGG consist of the relatively narrow lines in the UV spectral range related to the 4f–4f transitions in Gd3+. Transitions from the 6S7/2 ground state to the 6P, 6J and 6D states in a Gd3+ cation are clearly detected. For a GGG crystal containing Ca impurity ions, additional absorption band at 350 nm is observed, and it is tentatively ascribed to oxygen vacancies associated with Ca impurities. Several neutron-induced optical absorption bands, including ones related to F+ centres, were observed in fast neutron-irradiated Gd3Ga5O12 single crystals. Furthermore, clear evolution of the Raman spectra with neutron dose is also found. In particular, fine structure observed between 1350 and 1550 cm−1 is completely disappeared at high fluences, while several significant changes and the emergence of new transitions have been ascertained in spectral range of 100–850 cm−1.",

keywords = "GdGaO, Neutron irradiation, Optical absorption, Radiation defects, Raman, Thermal annealing",

author = "N. Mironova-Ulmane and I. Sildos and E. Vasil'chenko and G. Chikvaidze and V. Skvortsova and A. Kareiva and Mu{\~n}oz-Santiuste, \{J. E.\} and R. Pareja and E. Elsts and Popov, \{A. I.\}",

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year = "2018",

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doi = "10.1016/j.nimb.2018.02.006",

language = "English",

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Mironova-Ulmane, N, Sildos, I, Vasil'chenko, E, Chikvaidze, G , Skvortsova, V, Kareiva, A, Muñoz-Santiuste, JE, Pareja, R, Elsts, E & Popov, AI 2018, 'Optical absorption and Raman studies of neutron-irradiated Gd₃Ga₅O₁₂ single crystals', Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, vol. 435, pp. 306-312. https://doi.org/10.1016/j.nimb.2018.02.006

TY - JOUR

T1 - Optical absorption and Raman studies of neutron-irradiated Gd3Ga5O12 single crystals

AU - Mironova-Ulmane, N.

AU - Sildos, I.

AU - Vasil'chenko, E.

AU - Chikvaidze, G.

AU - Skvortsova, V.

AU - Kareiva, A.

AU - Muñoz-Santiuste, J. E.

AU - Pareja, R.

AU - Elsts, E.

AU - Popov, A. I.

PY - 2018/11/15

Y1 - 2018/11/15

N2 - In this work we have performed a comparative analysis of optical absorption and micro-Raman spectra for series of Gd3Ga5O12 (GGG) single crystals irradiated by fast neutrons with fluences from 1016 n/cm2 to 1018 n/cm2. It was found that the optical absorption spectra of non-irradiated Czochralski grown GGG consist of the relatively narrow lines in the UV spectral range related to the 4f–4f transitions in Gd3+. Transitions from the 6S7/2 ground state to the 6P, 6J and 6D states in a Gd3+ cation are clearly detected. For a GGG crystal containing Ca impurity ions, additional absorption band at 350 nm is observed, and it is tentatively ascribed to oxygen vacancies associated with Ca impurities. Several neutron-induced optical absorption bands, including ones related to F+ centres, were observed in fast neutron-irradiated Gd3Ga5O12 single crystals. Furthermore, clear evolution of the Raman spectra with neutron dose is also found. In particular, fine structure observed between 1350 and 1550 cm−1 is completely disappeared at high fluences, while several significant changes and the emergence of new transitions have been ascertained in spectral range of 100–850 cm−1.

AB - In this work we have performed a comparative analysis of optical absorption and micro-Raman spectra for series of Gd3Ga5O12 (GGG) single crystals irradiated by fast neutrons with fluences from 1016 n/cm2 to 1018 n/cm2. It was found that the optical absorption spectra of non-irradiated Czochralski grown GGG consist of the relatively narrow lines in the UV spectral range related to the 4f–4f transitions in Gd3+. Transitions from the 6S7/2 ground state to the 6P, 6J and 6D states in a Gd3+ cation are clearly detected. For a GGG crystal containing Ca impurity ions, additional absorption band at 350 nm is observed, and it is tentatively ascribed to oxygen vacancies associated with Ca impurities. Several neutron-induced optical absorption bands, including ones related to F+ centres, were observed in fast neutron-irradiated Gd3Ga5O12 single crystals. Furthermore, clear evolution of the Raman spectra with neutron dose is also found. In particular, fine structure observed between 1350 and 1550 cm−1 is completely disappeared at high fluences, while several significant changes and the emergence of new transitions have been ascertained in spectral range of 100–850 cm−1.

KW - GdGaO

KW - Neutron irradiation

KW - Optical absorption

KW - Radiation defects

KW - Raman

KW - Thermal annealing

UR - https://www.scopus.com/pages/publications/85042026717

U2 - 10.1016/j.nimb.2018.02.006

DO - 10.1016/j.nimb.2018.02.006

M3 - Article

AN - SCOPUS:85042026717

SN - 0168-583X

VL - 435

SP - 306

EP - 312

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 -

Optical absorption and Raman studies of neutron-irradiated Gd₃Ga₅O₁₂ single crystals

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