Indian Science Technology and Engineering facilities Map
Supplier Map
Service Map


Publication Details

Indian Institute of Technology (IIT) Patna 
L. K. Pradhan, R. Pandey, S. Kumar, S. Supriya and M Kar 
Corresponding Authors:
Manoranjan Kar 
DOI #:  
Octahedral distortion due to oxygen vacancy reduction in La3+ modified BNT-BTO solid solutions near morphotropic phase boundary 
J. Phys. D: Appl. Phys. 
Octahedral distortion, morphotropic phase boundary 
Currently, there is great interest in perovskite compounds (ABO3) due to their various applications as well as fundamental research that has taken place. However, oxygen vacancy in the perovskite is a very important parameter to control its physical properties. Hence, the polycrystalline ((Bi1−x La x )0.5Na0.5)0.94Ba0.06TiO3 (BLNBTO) with x  =  0.00, 0.02, 0.04, 0.06, 0.08 and 0.10 solid solutions was synthesized via a conventional solid-state reaction process to study the oxygen vacancies and its influence on dielectric property. Structural phase formation of the solid solutions has been studied by x-ray diffraction (XRD) technique. Rietveld analysis of the XRD pattern reveals the decrease of octahedral distortion with the increase of La3+ concentration in BNBTO (x  =  0.00) solid solution. The reduction of octahedral distortion in the solid solutions was also supported by Raman spectra analysis. The presence of oxygen vacancy has been observed from the analysis of x-ray photoelectron spectroscopy spectra corresponding to the different elements of the solid solutions. Furthermore, the distinct peak at high-temperature range (250 °C–350 °C) in impedance plots is ascribed to the presence of oxygen vacancy related dielectric relaxation phenomenon. The activation energy increases from 0.99 to 1.53 eV with the increase of La3+ mole fraction in BNBTO solid solution, which is obtained from impedance data using the Arrhenius equation. The increase of activation energy has been correlated with the reduction of oxygen vacancy. 
Entered by:
Venkata Dantham on 2020-08-02 
I-Mitra(आई-मित्र) Welcomes You..
It has always been the basic tenet of the Government of India, in generously funding R&D efforts at academic institutions over the years, that facilities established through such support be made available to those needing them and qualified to make use of them for their own research work

However, this was never easy or straightforward for, among other reasons, there was no ready source of information of what facility was available and where. Thanks to the Web, it is much easier today to have a national and regional “inventory of resources”, so as to match users with the resources they need, and to do all this in an efficient and transparent manner.

This can lead to a leap in R&D productivity and greatly enhance the effectiveness of public investment. This is the motivation behind I-STEM.
read less <<
Visitor Hit Counter
Hosted at Indian Institute of Science
Copyright © 2020 I-STEM. All rights reserved.
Audited by: STQC Bengaluru.