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Title of Journal: Pramana J Phys

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Abbravation: Pramana

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Springer-Verlag

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10.1002/chin.200507283

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0973-7111

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Effect of ZnO doping on the structural and optical

Authors: N Venugopalan Pillai R Vinodkumar V Ganesan Peter Koshy V P Mahadevan Pillai
Publish Date: 2011/07/12
Volume: 75, Issue: 6, Pages: 1157-1161
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Abstract

BaWO4 doped with ZnO 2 3 5 7 and 10 wt nanostructured films are prepared on quartz substrates by pulsed laser ablation The films are post annealed at 900°C GIXRD analysis of the postannealed films reveal the change of orientation of scheelite tetragonal crystal growth from 1 1 2 reflection plane to 0 0 4 planes when doping concentration is more than 3 wt The AFM images show that film with 7 wt ZnO doping concentration has good ceramic pattern with surface features giving a minimum value of rms surface roughness suitable for optoelectronic device applications The optical transmittance and bandgap energy of the films are found to decrease considerably on postannealing which can be due to the increase in grain size of the crystallites on annealing Thus doping with ZnO improves the surface features of the films and increases the optical bandgap energy

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