Biomedical Engineering Reference
In-Depth Information
Bi0.99Dy0.01FeO
3
Bi0.95Dy0.05FeO
3
bfo.prf:
bdfo. prf:
Yobs
Yobs
Ycalc
Ycalc
Yobs-Ycalc
Bragg_position
Yobs-Ycalc
Bragg_position
10
20
30
40 50
2 Theta (deg)
60
70
80
90
10
20
30
40
50
2 Theta (deg)
60
70
80
90
Figure 13.13
Rietveld rei nement pattern of Bi
1-x
Dy
x
FeO
3
(x=0.01 & x=0.05)
Bi0.9Dy0.1FeO
3
bdfo.prf:
Yobs
Ycalc
Yobs-Ycalc
Bragg_position
10
20
30
40
50
2 Theta (deg)
60
70
80
90
Figure 13.14
Rietveld rei nement pattern of Bi
1-x
Dy
x
FeO
3
(x=0.10).
positions: 6a (Bi
3+
and Fe
3+
) and 18 b (O
2-
). h e tilt angle for the anti-phase
rotation of the oxygen octahedra is found to be 12.2
[94]. h e Fe magnetic
moments are coupled ferromagnetically within pseudo-cubic (111) planes
and antiferromagnetically between adjacent planes, leading to G-type anti-
ferromagnetic ordering.
h e Rietveld rei nement analysis using the pseudo-voigt function of all
the compounds coni rmed a hexagonal structure with space group R3c and
point group 3m. h ere is good agreement between observed and calculated
pattern, which is coni rmed by the dif erence pattern.
It is clear from the rei nement of pure BiFeO
3
(Figure 13.10) that all
the peaks (except three peaks) of observed X-ray dif raction pattern are
well matched with the standard X-ray dif raction data of pure compound
(JCPDS#20-0169). h is indicates that the solid-state reaction between
