  In this paper, we have considered the interplay between phase transitions and
configuration mixing of intruder excitations in the 118-128Te isotopes. A
transitional interacting boson model Hamiltonian in both IBM-1 and IBM-2
versions which are based on affine Lie Algebra are employed to describe the
evolution from spherical to deformed gamma unstable shapes along the chain of
Te isotopes. The excitation energies, B(E0) and B(E2) transition rates are
rather well reproduced in comparison with experimental counterparts when the
weight of SO(6) limit is increased in Hamiltonian. Also our results show
obvious relations between the configuration mixing ratio and quadrupole,
hexadecapole and hexacontatetrapole deformation values in this isotopic chain.
