Microstructure and Electrical Properties of Nonstoichiometric 0.94(Na0.5Bi0.5+x)TiO3-0.06BaTiO3 Lead-Free Ceramics - Qiao, Xiao-Shuang; Chen, Xiao-Ming; Lian, Han-Li; Chen, Wei-Ting; Zhou, Jian-Ping; Liu, Peng (Journal of the American Ceramic Society, 2016)