Peak Shift

The TL intensity for first (Randall and Wilkins model) and second (Garlick and Gibson model) order of kinetics are respectively

(1)

and

(2)

where n is the trapped carrier concentration, s is the frequency factor, is the so-called pre-exponential factor, with N the available trap concentration.

Equation (2) can be rewritten as

(3)

with s"=s ?n, which is equivalent to s in the first order case.

Considering Eqs. (1) to (3), it can be seen that the peak temperature at the maximum, T _M , depends on E and s, s ? or s ?; then, if n changes, increase or decreases, a first-order peak remains in the same position, but a second-order peak shifts, i.e., to higher temperatures as n decreases because the variation in s ?.

Figures (1) and (2) show the different behaviors expected for glow peaks following a first-order kinetics or a second-order.

Fig. 1: Glow curves of first-order kinetics as a function of the given dose; n ₀ increases from (1) to (5).

Fig. 2: Behavior of the second-order glow curves as a function of the given dose; n ₀ increases from (1) to (5).

Perovskite s Family (ABX ₃)

Perovskite compounds corresponding to the general formula ABX ₃ (where A is an alkali metal, B is an alkaline earth metal, and X...