Sciact
  • EN
  • RU

Structural Properties Investigation of Different Alumina Polymorphs (η-, γ-, χ-, θ-, α-Al2O3) Using Cr3+ as a Luminescent Probe Научная публикация

Журнал Journal of Luminescence
ISSN: 0022-2313
Вых. Данные Год: 2022, Том: 242, Номер статьи : 118554, Страниц : 7 DOI: 10.1016/j.jlumin.2021.118554
Ключевые слова alumina polymorphs, luminescence, Cr3+ luminescent probe, structure
Авторы Baronskiy M.G. 1 , Tsybulya S.V. 1 , Kostyukov A.I. 1 , Zhuzhgov A.V. 1 , Snytnikov V.N. 1
Организации
1 Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, 630090, Novosibirsk, Russia

Информация о финансировании (2)

1 Министерство науки и высшего образования Российской Федерации (с 15 мая 2018) 0239-2021-0003
2 Министерство науки и высшего образования Российской Федерации (с 15 мая 2018) 0239-2021-0011

Реферат: The structural properties of η-, γB-, γPb-, χ-, θ- and α-Al2O3 polymorphs were studied by X-ray diffraction and photoluminescence spectroscopy using Cr3+ ion as a luminescent probe in its natural concentration (<10−3 wt%). The analysis of photoluminescence (PL) and photoluminescence excitation (PLE) data within the crystal field theory revealed a decrease in the crystal field strength Dq from 1810 to 1740 cm−1, the Racah parameter B from 606 to 432 cm−1, and the covalence parameter β1 from 1.076 to 1.062 in the series α-Al2O3 → γ-, η-Al2O3. This indicates that the fraction of covalent bond increases for the low-temperature γ-Al2O3 and η-Al2O3 phases as compared to α-Al2O3 powder and ruby single crystal. The obtained values of crystal field strength Dq, Racah parameters B and C, and covalence degree β1 also differ from each other among low-temperature phases η-, γB-, γPb- and χ-Al2O3. This testifies that each low-temperature Al2O3 polymorph has different ionicity/covalence ratio. The analysis of PL and PLE data showed that the chromium ion in χ-Al2O3 occupies the local structural positions that are similar to those in α-Al2O3. This occurs because, according to XRD data, the cubic closest packing of oxygen anions in χ-Al2O3 partially transforms into the hexagonal closest packing, which is typical of α-Al2O3.
Библиографическая ссылка: Baronskiy M.G. , Tsybulya S.V. , Kostyukov A.I. , Zhuzhgov A.V. , Snytnikov V.N.
Structural Properties Investigation of Different Alumina Polymorphs (η-, γ-, χ-, θ-, α-Al2O3) Using Cr3+ as a Luminescent Probe
Journal of Luminescence. 2022. V.242. 118554 :1-7. DOI: 10.1016/j.jlumin.2021.118554 WOS Scopus РИНЦ CAPlus OpenAlex
Даты:
Поступила в редакцию: 27 мая 2021 г.
Принята к публикации: 23 окт. 2021 г.
Опубликована online: 26 окт. 2021 г.
Опубликована в печати: 1 февр. 2022 г.
Идентификаторы БД:
Web of science: WOS:000718510600005
Scopus: 2-s2.0-85117946903
РИНЦ: 47518495
Chemical Abstracts: 2021:2340746
OpenAlex: W3208739762
Цитирование в БД:
БД Цитирований
Scopus 11
Web of science 11
РИНЦ 12
OpenAlex 13
Альметрики: