CHEM01200604004 Shri Sanyasinaidu Boddu - Homi Bhabha ...

gallium to urea ratio (1:20) remained unchanged while concentration of lanthanide ions were
varied. Figure 20 (a-e) shows the XRD patterns of as prepared samples containing different
amounts of Eu 3+ ions. As prepared GaOOH sample without any Eu 3+ ions is crystalline with
orthorhombic crystal structure (JCPDS No. 06-0180). With increase in Eu 3+ concentration,
there is a slight increase in line width of diffraction peaks and for samples prepared in the
presence of more than 1 at % Eu 3+ , no sharp peak characteristic of the crystalline materials is
observed instead a broad hump characteristic of the amorphous nature appeared. The lattice
parameters have been calculated for the crystalline samples based on least square fitting of
the diffraction peaks and are same within experimental errors for all the samples prepared in
the presence of different amounts of Eu 3+ ions (Table 1).
Intensity(arb.units)
1000
500
0
600
300
0
200
100
0
100
50
0
60
30
0
(020)
(110)
(120)
(130)
(021)
(111)
(121)
(140)
(131)
(041)
(221)
(211)
(231)
(151)
(002)
(061)
(c)
(d)
(e)
20 30 40 50 60 70
2θ/°
(a)
(b)
Fig.20 XRD patterns of GaOOH sample prepared in presence of (a) 0 at % (b) 0.5 at % (c) 0.75
at % (d) 1 at % and (e) 2 at % of Eu 3+ ions.
60