| Synthesis, Structural and Raman Investigations of
PbNi1/3Nb2/3O3 Ceramics |
Preeti,a Adityanarayan Pandey,b, c Rachna Selvamani,b Surya Mohan Guptab, c and Chander
Shekhara,*
Pages : 133-137
DOI : 10.1080/0371750X.2022.2123045 |
| Abstract |
| The Pb(Ni1/3Nb2/3)O3 (PNN) ceramics was synthesized by two different methods, viz.
(i) single step and (ii) double step. Phase formation of powders prepared by both the
methods at various temperatures and lead excess were analyzed by X-ray diffraction
(XRD) and Raman scattering experiments. The studies revealed that for single step
method the unreacted phases diminished with increase of firing temperature and
only impure nickel niobate phase remained at 1200oC. Addition of 4 wt% excess lead
oxide reduced the impure nickel niobate phase concentration from 8.9% to 4.2% for
the single step method. Addition of 2 wt% excess lead oxide was found sufficient to
remove pyrochlore nickel niobate phase for double step method. Temperature
dependent XRD showed pure phase throughout the temperature range of 35 to 350 K
indicating the stability of the phase formed. The Raman study also confirmed the
formation of pure perovskite phase.
[Keywords: Lead oxide, Lead nickel niobate, Raman studies, Low temperature XRD,
Coulmbite method] |
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