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Lattice Defects Induce Multiferroic Responses in Ce, La‐Substituted BaFe 0.01 Ti 0.99 O 3 Nanostructures
Author(s) -
Verma Kuldeep Chand,
Kotnala Ravinder Kumar
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14130
Subject(s) - materials science , antiferromagnetism , rietveld refinement , condensed matter physics , tetragonal crystal system , multiferroics , raman spectroscopy , ferroelectricity , phase transition , magnetization , crystallography , crystal structure , magnetic field , dielectric , chemistry , physics , optoelectronics , quantum mechanics , optics
Single‐phase multiferroic Ba(Fe 0.67 Ce 0.33 ) 0.01 Ti 0.99 O 3 ( BFTO :Ce) and Ba(Fe 0.67 La 0.33 ) 0.01 Ti 0.99 O 3 ( BFTO :La) nanostructures were synthesized by a hydrothermal method (180°C/48 h). Rietveld refinement of X‐ray diffraction could confirm crystalline phase and lattice deformation by Ce, La into BFTO . The Ce and La doping induce nanoaggregation‐type BFTO nanostructural product due to their ionic size effect and chemical behavior with OH − ions. Raman active modes show tetragonal phase and defects due to vacancies in the BFTO lattice. Photoluminescence spectrum involves multiple visible emissions due to defects/vacancies. The observed ferroelectric polarization is enhanced due to shape/size effect of nanoparticles, lattice distortion, and filling of d orbital in the perovskite BaTiO 3 . The room‐temperature magnetic behavior is described due to antiferromagnetic interactions that strengthen by Ce and La doping. The zero‐field cooling and field cooling magnetic measurement at 500 Oe indicates antiferromagnetic to ferromagnetic transition. Dynamic magnetoelectric coupling was investigated, and maximum longitudinal magnetoelectric coefficient is 62.65 and 49.79 mV/cmOe, respectively, measured for BFTO :Ce and BFTO :La. The magnetocapacitance measurements induce negative values that described in terms of magnetoresistance and magnetic phase transition effects. The influence of oxygen vacancy on multiferroicity is evaluated by valance states of O ions.