Synthesis of heat storage ceramic λ-Ti3O5 using titanium chloride as the starting material

Abstract

This study reports a simple method for synthesizing λ-Ti₃O₅ through hydrogen reduction calcination using titanium chloride as the starting material. Upon applying 300 MPa pressure, λ-Ti₃O₅ transitions to β-Ti₃O₅ as a pressure-induced phase transformation. The β-Ti₃O₅ produced under pressure reverts to λ-Ti₃O₅ at 462 K upon heating, accumulating 7.78 kJ mol⁻¹ of heat energy. An investigation of the influence of the crystalline size on the threshold pressure required for the phase transition and the values of transition enthalpy of the transition between λ-Ti₃O₅ and β-Ti₃O₅ reveals that larger crystalline sizes correlate with lower threshold pressures and higher transition enthalpies. Understanding the interplay between the crystalline size of λ-Ti₃O₅ and its heat storage properties is crucial for designing phase transition materials tailored to specific heat storage requirements. This research paves the way for the development of more efficient heat storage materials, potentially impacting various industrial applications and energy conservation methods.