Spectroscopy of structurally disordered hydrated iron fluoridotitanate in the regions of vibrational and electronic excitations

Описание

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

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Издание

Журнал: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy

Выпуск журнала: Vol. 264

Номера страниц: 120244

ISSN журнала: 13861425

Издатель: Elsevier B.V.

Персоны

  • Gerasimova Yu. V. (RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660079, Russia)
  • Aleksandrovsky A.S. (RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660079, Russia)
  • Laptash N.M. (RAS, Far Eastern Branch, Inst Chem, Vladivostok 690022, Russia)
  • Gerasimov M.A. (RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia)
  • Krylov A.S. (RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia)
  • Vtyurin A.N. (RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660079, Russia)
  • Dubrovskiy A.A. (RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia)