  The transport properties of matter have been widely investigated. In
particular, shear viscosity over a wide parameter space is crucial for various
applications, such as designing inertial confinement fusion (ICF) targets and
determining the Rayleigh-Taylor instability. In this work, an extended
random-walk shielding-potential viscosity model (RWSP-VM) [Phys. Rev. E 106,
014142] based on the statistics of random-walk ions and the Debye shielding
effect is proposed to elevate the temperature limit of RWSP-VM in evaluating
the shear viscosity of metals. In the extended model, we reconsider the
collision diameter that is introduced by hard-sphere concept, hence, it is
applicable in both warm and hot temperature regions (10^1-10^7 eV) rather than
the warm temperature region (10^1-10^2 eV) in which RWSP-VM is applicable. The
results of Be, Al, Fe, and U show that the extended model provides a systematic
way to calculate the shear viscosity of arbitrary metals at the densities from
about 0.1 to 10 times the normal density (the density at room temperature and 1
standard atmosphere). This work will help to develop viscosity model in wide
region when combined with our previous low temperature viscosity model [AIP
Adv. 11, 015043].
