1 23 Journal of Electroceramics ISSN 1385-3449 Volume 28 Combined 2-3 J Electroceram (2012) 28:109-117 DOI 10.1007/s10832-012-9690-y Electrical and structural characterization of PTCR pure BaTiO 3 nanopowders synthesized by sol–gel emulsion technique Zubeda Bi H. Aga & Sutapa Roy Ramanan