Fabrication of magnetoelectric laminates of lead free
(0.5) BaCaTiO3 – (0.5) BaZrTiO3 / FeSiBNbCu for
field sensing applications
A Srinivas*, D. Aravindha Babu, K. Prabahar, B. Majumdar and S V Kamat
Advanced Magnetics Group, Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad –
500058 India
*
e-mail: adirajs@dmrl.drdo.in , Tel.: +91-40-24586835; Fax: +91-40-24340884
Abstract
Lead free magnetoelectric laminates has been prepared by
sandwiching (0.5) BCT – (0.5) BZT between two FeSiBNbCu
ribbons by epoxy bonding. The ferroelectric, magnetic and
magnetoelectric properties of the laminates have been
investigated. The objective of the present study is to
investigate the thickness dependent magnetoelectric nature.
clearly shows dense microstructure with a grain size in
the range between 8-10 m. The bulk density of the
sintered sample measured by Archimedes method is
about 92% of the theoretical density.
Keywords: Ferroelectric, Magnetic, Nano-crystalline,
Magnetoelectric, Sensors
Introduction
Multiferroics are materials which exhibit more than
one ferroic order. They exhibit induced electric
polarization on the application of magnetic field and
induced magnetization on the application of electric field
[1]. Magnetoelectric materials are a class of multiferroic
materials that display simultaneous magnetic and electric
ordering. Magnetoelectric laminates are expected to
produce an enhanced ME output when compared with
the single phase and particulate composites [2]. The
present study focuses on the development of lead free
piezoelectric/magnetostrictive laminates of (0.5)
BaCaTiO3- (0.5) BaZrTiO3 and Fe73.5Si13.5B9Nb3Cu1 to
attain an enhanced magnetoelectric output at low
magnetic fields for field sensing applications.
Fig.1. Microstructure of (0.5) BCT (0.5) BZT
Experimental procedure
(0.5) BaCaTiO3- (0.5) BaZrTiO3 was synthesized by
conventional solid state sintering route. The raw
materials were taken in a Stoichiometric ratio’s mixed,
ground and were pre-sintered at 1250˚C/h. The powders
were ground again for 3h and pellets were prepared and
final sintered at 1500˚C/3h.
Fe73.5Si13.5B9Nb3Cu1
ribbons were prepared by the melt-spinning technique.
The ME laminates were fabricated by stacking a layer of
FeSiBNbCu and then (0.5) BaCaTiO3- (0.5) BaZrTiO3
and FeSiBNbCu using a glue / epoxy. The
magnetoelectric output was measured by dynamic
technique. The d.c and a.c fields were superimposed and
using the lock-in-technique the o/p is measured at 1.0
kHz frequency.
Results and Discussion
Field emission scanning electron micrograph of the
sintered (0.5) BCT (0.5) BZT sample displayed in Fig. 1
Fig.2: M-H behavior of Fe73.5Si13.5B9Nb3Cu1
M-H behaviour of Fe73.5Si13.5B9Nb3Cu1 measured in
parallel and perpendicular directions of the magnetic
field that indicates very low coercivity values and high
permeability values. The magnetoelectric voltage
showed variations by varying thickness of the
piezoelectric/magnetostrictive phases.
Acknowledgment
We acknowledge DRDO for providing financial support
to this project.
References
[1]. H. Schmid, Ferroelectrics 162, 317, (1994)
[2]. G. A. Smolenskii and I.E. Chupis, Sov. Phys, Usp
25, 475 (1982).