Тип публикации: статья из журнала
Год издания: 2022
Идентификатор DOI: 10.1016/j.saa.2021.120244
Ключевые слова: dynamics, electronic excitations, hydrated iron fluoridotitanate, order-disorder, phase transition, raman
Аннотация: Raman and optical absorption spectra of disordered hydrated iron fluoridotitanate (HITF) single crystal were studied. Temperature transformations of the Raman spectra indicate independent ordering processes of the [TiF6]2− and [Fe(H2O)6]2+ complexes below the structural phase transition. The absorption spectrum in the near-infraredПоказать полностьюand visible ranges includes transitions from the high spin ground state 5T2 of Fe2+ ion to the excited 5E state and a set of excited triplets. Analysis by Tanabe-Sugano method gives crystal field Dq = 490 cm−1 and Racah parameters B = 340 cm−1 and C = 1904 cm−1. Considerable decrease of B parameter as compared to the free ion value indicates a decrease of interelectron repulsion in the disordered neighborhood of Fe2+ ions. © 2021
Журнал: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Выпуск журнала: Vol. 264
Номера страниц: 120244
ISSN журнала: 13861425
Издатель: Elsevier B.V.