Effect of substitution group on dielectric properties of 4H-pyrano [3, 2-c] quinoline derivatives thin films
Zeyada H M
1
, El-Taweel F M
2
, El-Nahass M M
3
, El-Shabaan M M
1, †,
Variation of the frequency exponent
s
with temperature for (a) Ph-HPQ and (b) Ch-HPQ.