title: Kinetic Studies on the Synthesis of Monoclinic Li3V2(PO4)3via Solid-State Reaction.
abstract: The data obtained by thermogravimetry (TG), differential thermal analysis (DTA), and X-ray diffraction (XRD) measurements of the stoichiometric mixture of LiNO3, NH4VO3, and NH4H2PO4were analyzed by both the Flynn-Wall-Ozawa (FWO) and Friedman-Reich-Levi (FRL) methods. The whole solid state reaction process could be divided into four stages corresponding to α values of 0.03-0.20, 0.30-0.60, 0.70-0.80, and 0.90-0.99. The nucleation of LiVP2O7(α = 0.70-0.80) is a determining step of the four-reaction processes, for which the mechanism of random nucleation and subsequent growth, described by the Avrami-Erofeev equation (n = 4) G(α) = [-ln(1 - α)]4, was assumed. Moreover, the Gibbs free energy of activation ΔG*, enthalpy of activation ΔH*, and entropy of activation ΔS* at maximum temperature of the peak for the determining step were 99.24 kJ·mol-1, 199.97 kJ·mol-1, and 136.30 J·mol-1·K-1, respectively. Finally, XRD analyses confirmed that the Li3V2(PO4)3synthesized by the precursor route is a pure phase.
authors.affiliation: College of Materials and Chemistry and Chemical Engineering, Chengdu University of Technology , Chengdu 610059, P. R. China.
authors.forename: Shanhua
authors.initials: S
authors.lastname: Chen
authors.affiliation: College of Materials and Chemistry and Chemical Engineering, Chengdu University of Technology , Chengdu 610059, P. R. China.
authors.forename: Jun
authors.initials: J
authors.lastname: Wu
authors.affiliation: College of Materials and Chemistry and Chemical Engineering, Chengdu University of Technology , Chengdu 610059, P. R. China.
authors.forename: Zelong
authors.initials: Z
authors.lastname: Su
authors.affiliation: College of Materials and Chemistry and Chemical Engineering, Chengdu University of Technology , Chengdu 610059, P. R. China.
authors.forename: Ling
authors.initials: L
authors.lastname: Deng