Mannepalli, Venkateswara Rao and M M, Saj Mohan and Ramadurai, Ranjit
(2017)
Tailoring the Band gap and magnetic properties by Bismuth substitution in Neodymium Chromite.
Bulletin of Materials Science.
pp. 1-24.
ISSN 0250-4707
(In Press)
Abstract
The intrinsic distortions present in r
are earth
ortho
chromites (RCrO
3
)
observed from lanthanum to lutetium
(in
R
-
site) can
influence the magnetic properties
like Neel Transition and weak
ferromagnetic coupling
.
A n
on
-
magnetic
cation with
similar ionic radius
would
be
a
suitable candidate to
engineer
the inherent distortions of particular
orthochromite. In
this study
Bismuth (Bi
3+
)
with a 6s
2
lone pair was chosen to substitute
in Neodymium
(Nd
3+
)
site
of
NdCrO
3
(NCO)
to
tailor
the int
rinsic
structural distortions.
Th
e variation of optical absorption edge evidently
suggests that
Bi (
6
s
2
)
substituted in the m
agnetic rare earth Nd
+3
influences the Cr
-
O overlap integral.
Th
e
interaction of Bi cation with oxygen bonds influences the structural distortions through Cr
-
O polyhedra which are
evident from
Raman scattering studies
. The observed structural and magnetic properties of similar ionic radius of
Bi
3+
in Nd
3+
reveals that intrinsic structural distortions are interrelated to enhanced weak ferromagnetic component
and change in Neel and spin reorientation temperatures in our compou
nds
.
In addition a reduction in the optical band
gap of NCO from 3.1 eV to 2.
6
eV w
as observed.
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