A study on the thermopower and resistivity properties of Ti doped manganites Gd0.7Sr0.3Mn1-xTixO3 (x=0,0.1 and 0.15)

Thermoelectric power (TEP) along with temperature dependent resistivity of Ti doped Gd-Sr manganite (Gd0.7Sr0.3Mn1-xTixO3 (x = 0, 0.1 and 0.15) denoted by G, G(0.1) and G(0.15) respectively) are studied systematically. Significant Seebeck coefficients (S) are exhibited by all the three samples which is a most desirable quality of a good thermoelectric material. In the case of sample G, highest attained value of S is -35.57mVK(-1) at 91 K. For G(0.1) and G(0.15) highest attained values are -31.60 mVK(-1) at 114 K and 33.76 mVK(-1) at 133 K respectively. This reveals that Ti doping shifts the highest value of S to higher temperatures. Diffusion and magnon drag contribute to TEP at lower temperatures. Temperature dependence of thermopower at comparatively higher temperature region gives an insight of combined SPH and VRH models. Temperature dependent electrical resistivity is successfully analyzed within the interesting framework of variable range hopping of small polarons. (C) 2021 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the International Web Conference on Advanced Materials Science and Engineering.