An increasing trend of exponent (n) as a function of temperature is attributed to small polaron hopping, whilst the reverse trend as a function of temperature corresponds to large polaron hopping.
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Fortified relaxor ferroelectricity of rare earth substituted 4-layered BaBi<sub>3.9</sub>RE<sub>0.1</sub>Ti<sub>4</sub>O<sub>15</sub> (RE = La, Pr, Nd, and Sm) Aurivillius compounds.
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