Crystallographic Features and Nature of Luminescence Centres of the Niobate and Tantalate Compounds with Layered Perovskite-Like Structure
Oksana Chukova1, *, Sergiy Nedilko1, Yuriy Titov1, Vadym Sheludko2
Identifiers and Pagination:Year: 2018
First Page: 2
Last Page: 13
Publisher Id: TOMSJ-12-2
Article History:Received Date: 09/12/2017
Revision Received Date: 18/2/2018
Acceptance Date: 22/2/2018
Electronic publication date: 28/02/2018
Collection year: 2018
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: (https://creativecommons.org/licenses/by/4.0/legalcode). This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Aim and Objectives
The ultrafine powders of the perovskite-like layered AII3LaM3O12 (AII = Sr, Ba; M = Nb, Ta) compounds have been synthesized by heat treatment of co-precipitated hydroxy-carbonates. The luminescence of these compounds is reported for the first time.
Luminescence spectra of all studied compounds are complex and contain two main wide bands with maxima near 2.9 and 2.5 eV. These luminescence bands were assigned to radiation electron transitions in the MoO67- molecular groups of different symmetry located in the various lattice positions.
The energy levels scheme of the MoO67- group and related radiation and absorption transitions had been proposed.