Unraveling Thermoluminescence by C M Sunta

Author:C M Sunta
Language: eng
Format: epub
Publisher: Springer India, New Delhi

(4.20)

where c α and b α are constants in which α stands for τ, δ, or ω. Table 4.2 shows the values of the constants c α and b α for first- and second-order kinetics. For distinction between first- and second-order kinetics Halperin and Braner [20] suggested the use of the symmetry factor µ of the glow peak which is defined as µ = δ /ω. An FO peak is characterized by µ = 0.42 and a second-order peak by µ = 0.52. For the general case in which KO is not necessarily equal to 1 or 2, Chen [1] investigated the correlation between µ and the three parameters, namely the activation energy E, the pre-exponential factor , and the kinetics order b. Chen used the glow curve Eq. (3.​18) (refer Sect. 3.​3.​3) of the GO kinetics model for this study and found that µ is strongly dependent on b and practically independent of E and . The computations covered wide range of input values namely 0.7 ≤ b ≤ 2.5, 0.1 ≤ E ≤ 1.6 eV, and . The result is shown in Fig. 4.8. It may be seen that the deviations in µ values for various E and are within about ±7 %. Figure 4.8 may be used to find the value of b from the measured value of µ in an experimentally measured glow peak. To find the values of c α and b α in (4.20) for b ≠ 1 and ≠2, Chen [1] used the measured µ value as an interpolation parameter along with known values of µ = 0.42 and µ = 0.52 for b = 1 and b = 2 respectively. The expressions for c α and b α thus found are

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