TQ properties of M
materials (M = Ca, Sr, Ba). (a) Temperature-dependent normalized-intensity curves are shown as functions of I
= [1 + D exp(−E
a/kT)]−1 where I
(the intensity at T = 0), D, and E
a (the activation energy) are refined variables. (b) The relations of the activation energies and components for different alkaline earth metal series. (Reprinted with permission from reference . Copyright 2012, American Chemical Society).