  We report the magnetic and dielectric behavior of Pb6Ni9(TeO6)5, a new
compound comprising the honeycomb-like layers of S=1 spins, through detailed
structural, magnetic and dielectric investigation. An antiferromagnetic-type
transition at 25 K (TN) with weak-ferromagnetic behavior is revealed.
Interestingly, a large value of coercive field of 1.32 T at 2 K is observed.
The isothermal magnetization after zero-field-cooled condition, it exhibits the
presence of large spontaneous exchange bias (SEB) with a magnitude of 0.19 T at
2 K; which is rare in single bulk materials, especially without external
doping. The value of |HEB| further enhances to 0.24 T under 16 T field-cooled
condition, confirming the presence of large exchange bias in the material. In
addition, the dielectric constant shows an anomaly at the onset of TN,
indicating the presence of magnetodielectric coupling.
