To reveal the infrared absorption causes in wavelength region between electronic and lattice absorptions, we measured temperature dependence of coefficient $p$-type low-resistivity ($\sim 10^2~{\rm \Omega cm}$) CdZnTe crystals. We coefficients crystals four-wavelength bands ($\lambda=6.45$, 10.6, 11.6, 15.1$~\mu$m) over range $T=8.6-300$ K with an originally developed system. The was to be $\al...