Effects of CuO and ZnO Additives on Sintering Temperature and Piezoelectric Properties of 0.41Pb(Ni<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub>–0.36PbTiO<sub>3</sub>–0.23PbZrO<sub>3</sub>CeramicsCheol‐Woo Ahn, Jae–Sung Song, Jungho Ryu et al.|Japanese Journal of Applied Physics|2004Cited by 50