Furthermore, tanδ experiences a decreasing trend with increasing frequency and after that, remains stable at a higher frequency of 20 kHz and above for all the samples, except for x = 0.03.
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Effects of yttrium doping on structural, electrical and optical properties of barium titanate ceramics.
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The sentences
The optical bandgap energy (∼2.63–3.72 eV) estimated from UV-Vis-NIR diffuse reflection data shows an increasing trend with a higher concentration of yttrium doping.