Thermoelectric power and resistivity are measured for the perovskite LaNi1-xTixO3 (x≤0.5) in thetemperature range 77K−300K. The measured thermoelectric power of LaNi1-xTixO3 (x≤0.5) increases linearlywith temperature and is represented by A+BT. The x=0.1 sample showed metallic behavior, the x=0.3showed metal and insulating transition around 150K, and x=0.5 showed insulating behavior the over thewhole temperature range. The electrical resistivity of x=0.1 shows linear temperature dependence over thewhole temperature range and T2 dependence. On the other hand, the electrical resistivity of x=0.3 shows alinear relation between lnρ and T−1/4 (variable range hopping mechanism) in the range of 77K to 150K. Forx=0.5, the temperature dependence of resistivity is characteristic of insulating materials; the resistivity datawas fitted to an exponential law, such as ln(ρ/T) and T−1, which is usually attributed to a small polaronhopping mechanism. These experimental results are interpreted in terms of the spin polaron (x=0.1) andvariable range hopping (x=0.3) or small polaron hopping (x=0.5) of an almost localized Ni3+ 3d polaron.

• 정우환 | Jung, Woo-Hwan