A new niobate Sr<sub>6</sub>Ti<sub>7</sub>Nb<sub>9</sub>O<sub>42</sub> was synthesized for the first time by solid state reaction in SrO-TiO<sub>2</sub>Nb<sub>2
The resistivity of conductive composites ofNBR(Butadiene nitrile rubber)filled with conductive car-bon black and two kinds of special organic fillers was mea-su