Sample

Particle size

(μm)

Optical density of 778 cm−1 peak

Optical density of 695 cm−1 peak

Crystallinity index

Extinction coefficient (K)

G-1

<45

0.571

0.544

1.049

89.69

G-2

45 - 63

0.566

0.543

1.041

88.85

G-3

63 - 90

0.560

0.540

1.036

87.98

G-4

>90

0.557

0.543

1.026

87.53

K-1

<45

0.628

0.550

1.142

98.69

K-2

45 - 63

0.601

0.537

1.119

94.41

K-3

63 - 90

0.590

0.553

1.066

92.68

K-4

>90

0.582

0.561

1.038

91.46