Preparation of LiZn0.9PO4:Mn0.1·H2O via a simple and novel method and its non-isothermal kinetics using iso-conversional calculation procedure

The LiZn0.9PO4:Mn0.1·H2O was synthesized via solid-state reaction at room temperature using LiH2PO4·H2O, ZnSO4·7H2O, MnSO4·H2O and Na2CO3 as raw materials. The experimental results show that the synthesized product is orthorhombic LiZn0.9PO4: Mn0.1·H2O, monoclinic LiZn0.9PO4:Mn0.1 is a green-yellow emitting phosphor which can be obtained after calcining LiZn0.9PO4:Mn0.1·H2O at 600 °C in air. Based on the iterative iso-conversional procedure, the average values of the activation energies associated with the thermal dehydration of LiZn0.9PO4:Mn0.1·H2O, was determined to be 90.28 kJ mol−1. Dehydration of the crystal water molecule of LiZn0.9PO4:Mn0.1·H2O is single-step reaction mechanism. A method of multiple rate iso-temperature was used to determine the most probable mechanism g(α) of the dehydration step. It is Mample single model (g(α) = −ln(1 − α)) and is controlled by random nucleation and subsequent growth mechanism. The pre-exponential factor A was obtained on the basis of Ea and g(α). Besides, the thermodynamic parameters (ΔS≠, ΔH≠, and ΔG≠)) of the dehydration reaction of LiZn0.9PO4:Mn0.1·H2O were determined.