RESEARCH ARTICLE


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
1 Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Str., 01033, Kyiv, Ukraine
2 Oleksandr Dovzhenko National Glukhiv University, Sumy Region, 41400, Glukhiv, Ukraine


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© 2018 Chukova et al.

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.

* Address correspondence to this author at the Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Str., 01033, Kyiv, Ukraine; Tel: 380980611526; E-mail: chukova@univ.kiev.ua


Abstract

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.

Methods:

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.

Conclusion:

The energy levels scheme of the MoO67- group and related radiation and absorption transitions had been proposed.

Keywords: Tantalate, Niobate, Perovskite, Layer, Luminescence.