The Open Materials Science Journal
2018, 12 : 2-13Published online 2018 February 28. DOI: 10.2174/1874088X01812010002
Publisher ID: TOMSJ-12-2
RESEARCH ARTICLE
Crystallographic Features and Nature of Luminescence Centres of the Niobate and Tantalate Compounds with Layered Perovskite-Like Structure
1
Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Str., 01033, Kyiv,
2 Oleksandr Dovzhenko National Glukhiv University, Sumy Region, 41400, Glukhiv,
* 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
2 Oleksandr Dovzhenko National Glukhiv University, Sumy Region, 41400, Glukhiv,
* 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.