  The charge ordering in La1.5Sr0.5NiO4 has been studied with neutron
diffraction technique. An interesting rearrangement of the charge ordering was
observed as a function of temperature. With decreasing temperature, a
checkerboard-type charge order is formed below T{CO-C} ~ 480 K. It is, however,
taken over by the stripe-type charge order with an incommensurability twice as
large as that of the spin order below T{CO-IC} ~ 180 K. Surprisingly, the
stripe phase persists up to x = 0.7 for highly hole-doped samples of
Nd{2-x}Sr{x}NiO{4} with 0.45 < x < 0.7.
