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We report the observation of metal-like to insulator transition (MTI) in the3dpyrochlore oxide Tb2Ti2O7 at 603 K due to the interaction of empty 3dorbitals of Ti4+ with O2- ions, evidenced by the transition in resistivity.Magnetisation, specific heat capacity and differential scanning calorimetrysupport the MTI, and the transition is of second order. An appreciable changein magnetisation with temperature, without any magnetic phase transition, is abehaviour typical in this family of compounds which is seldom observed in emptyd orbital pyrochlores. The possible mechanism that supports the MTI in Tb2Ti2O7is discussed. Subsequently, a broad change in magnetisation from 696 K is alsoseen. Thermogravimetric analysis confirms the observed MTI (603 K) and thebroad change in magnetisation (696 K)are not due to oxygen vacancy

First Observed Metal-like to Insulator Transition in the vacant 3d orbital Quantum Spin Liquid Tb$_2$Ti$_2$O$_7$