Electrical properties of the Sr2Ru1−xTixO4 solid solutions

The Sr2Ru1−xTixO4 solid solution with the K2NiO4-type structure has been prepared by a conventional solid-state reaction method. The lattice constants of Sr2Ru1−xTixO4 refined by the whole-powder-pattern-decomposition (WPPD) method have increased a-axis and decreased c-axis with the substitution of Ti4+ for Ru4+. The change from metal to semi-conducting behavior has been confirmed between x = 0.2 and 0.4. Seebeck coefficient Q is positive for x = 0, 0.2, 0.4, 0.6 and 0.8. In addition, a large difference of Seebeck coefficient has been observed below 326.84 °C between x = 0.4 and 0.6. The electronic states of Sr2RuO4 have been covered to the Ru 4d state surrounding of Fermi level widely calculated by DV Xα method. The energy band gap of Sr2TiO4 have observed between the O 2p state and Ti 3d state. The experimental conductive behavior has been supported by DV Xα simulation results.