  SrTiO$_{3}$ is known to be an incipient ferroelectric. It is thought that
ferroelectric stability in SrTiO$_{3}$ is suppressed by a delicate competition
with quantum fluctuation and antiferrodistortion. The ferroelectric phase can,
however, be stabilized by doping, isotope manipulation and strain engineering
etc. Till date ferroelectricity in SrTiO$_{3}$ thin films was observed to exist
up to room temperature -- that was when the films were grown on specially
engineered substrates using complex growth techniques. It was possible to write
and erase ferroelectric domains on the specially engineered films at room
temperature. Here, we show remarkably similar ferroelectric behavior in bulk
(110) single crystals of SrTiO$_{3}$ with no special engineering well above
room temperature using piezoresponse force microscopy. Hysteretic switching of
local electric polarization was observed and electrically active domains could
be written and erased using lithographic techniques at remarkably high
temperatures up to $420K$.
