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Applicant:
Indian Institute of Technology (IIT) Patna 
Author:
Chandrakanta Panda, Pawan Kumar, Rajnish Kumar and M. Kar  
Corresponding Authors:
Manoranjan Kar 
DOI #:
10.1166/asl.2016.6962 
Title:
Enhanced Magnetic Properties near MPB in Ho and Mn Co-Substituted Nanocrystalline BiFeO3 
Journal:
Advanced Science Letters 
Year:
2016 
Volume:
22 
Page:
766 
Keywords:
Magnetic Properties 
Abstract:
The disappearance of characteristic superlattice reflections as (113) at 2 = 37.8° for R3c space group along with the appearance of the typical reflections of Pbnm space group as (111) at 2 = 25.5° have been observed for 10% of co-substitution (Ho in Bi site and Mn in Fe site of BiFeO3) where the contribution from the Pbnm phase becomes dominant. Analysis of XRD patterns by employing Rietveld method suggest the compositional driven crystallographic phase transition from rhombohedral (R3c space group) to orthorhombic (Pbnm space group) symmetry with the increase in substitution concentration. The co-substitution of Ho and Mn at Bi and Fe sites respectively in BiFeO3 significantly suppress the impurity phases (Bi25FeO40, Bi2Fe4O9 etc.) for 3% of co-substitution. The crystallographic results are well supported by the RAMAN as well as FTIR spectra analysis. The remnant magnetization for sample with 3% of co-substitution is around 13 times that of pure one due to the suppression of cycloid spin structure and uncompensated spins at the surface of nanocrystallites. Further increase in co-doping percentage results in the reduction of remnant magnetization due to the appearance of collinear antiferromagnetic ordering in the Pbnm space group. A correlation between the crystal symmetries and magnetic properties has been identified. 
Entered by:
Venkata Dantham on 2020-08-03 
 
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