I have prepared Vanadium doped Barium titanate and transition temperature (135 - 147°C) is slightly shifted towards higher temperature for 2 mol% Vanadium content. What can be the possible reasons?Application of increased Tc ?
I think you need more details about the interaction between the doping agent and the base material. Defects can do this, please read
Böttcher, R., H. T. Langhammer, T. Walther, F. Syrowatka, and S. G. Ebbinghaus. "Defect properties of vanadium doped barium titanate ceramics." Materials Research Express 6, no. 11 (2019): 115210.
Hanumaiah, A., T. Bhimasankaram, S. V. Suryanarayana, and G. S. Kumar. "Dielectric measurements in vanadium doped barium titanate." Bulletin of Materials Science 18, no. 1 (1995): 93-97.