  We study the spin-1 Ising model with bilinear and biquadratic exchange
interactions and single-ion crystal field. In addition to the four usual
phases: disordered DIS, ferromagnetic FER, antiquadrupolar AQU and
ferrimagnetic FRI, we found three new phases in the case of a thin magnetic
film, namely: the sublattice A non magnetic phase NMA, the sublattice B non
magnetic phase NMB and the global non magnetic phase NMG. These phases are
studied, for each layer of the film, either in the temperature-crystal field
plane $(T,\Delta)$ or in the biquadratic coupling-crystal field plane
$(d,\Delta)$, for diferent film thicknesses. On the other hand, the thermal
behaviour of the layer quadrupolar moments $q_{A}, q_{B}$ and layer
magnetisations $m_{A}, m_{B}$ are investigated for negative values of the
biquadratic coupling and crystal field. It is also found that for fixed values
of the biquadratic coupling, the temperature and the crystal field, each layer
of the film can belong to a differnt phase. To illustrate this situation, an
example is given for $d=-3.0$, $\Delta =-3.0$ and $T=1.3$.
