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After [128] Schematic form of the principal thermodynamic parameters through a phase transformation at Tc. Column I = first order; column II =second order; column III = λ transformation with a small first order break at Tc ; column IV = λ transformation with no first order break. G = free energy, H = enthalpy, S = entropy, ηl = long range order parameter ηs= short range order parameter describing precursor ordering above Tc; CP = specific heat; Ik = integrated intensity of a superlattice reflection. D = disordered state, O= ordered state. LRO = long range order, SRO = short range order. Volume is not shown, but must be continuous or discontinuous in some manner analogous to H and S

After [128] Schematic form of the principal thermodynamic parameters through a phase transformation at Tc. Column I = first order; column II =second order; column III = λ transformation with a small first order break at Tc ; column IV = λ transformation with no first order break. G = free energy, H = enthalpy, S = entropy, ηl = long range order parameter ηs= short range order parameter describing precursor ordering above Tc; CP = specific heat; Ik = integrated intensity of a superlattice reflection. D = disordered state, O= ordered state. LRO = long range order, SRO = short range order. Volume is not shown, but must be continuous or discontinuous in some manner analogous to H and S

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