CHEM01200604004 Shri Sanyasinaidu Boddu - Homi Bhabha ...

almost normal to the equatorial plane with Ga at the centre, while the other octahedral axis
formed with GaO b is slightly tilted from the normal. The inequivalent oxygen atoms (O a and
O b ) form two different kinds of OH linkages in the GaOOH structure, with one of the axial
oxygen atom (O b ) bonded directly to hydrogen, while another oxygen atoms (O a ) is hydrogen
bonded with hydrogen of the neighboring octahedron.
(a)
(b)
(c)
(d)
Fig.22. SEM images of GaOOH nanorods prepared in presence of (a) 0 at % Eu 3+ (b) 0.5 at
% Eu 3+ (c) 1 at % Eu 3+ and (d) 2 at % Eu 3+ .
GaOOH phase has a structure similar to the mineral diaspore (α-AlO(OH)) [183].
Detailed vibrational studies were carried out using infrared (IR) and Raman spectroscopic
techniques for understanding the effect of Eu 3+ incorporation on the structure of GaOOH
lattice. IR patterns corresponding to GaOOH samples prepared in presence of different
concentrations of Eu 3+ ions is shown in Fig.23 (A and B). For the purpose of direct
comparison the IR pattern of Ga(OH) 3 prepared by adding ammonium hydroxide to Ga 3+
solution is also shown in the same figure (Fig.23 A(f)). GaOOH nanorods prepared without
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