Characteristics of Nanosize Spinel NixFe3-xO4 Prepared by Sol-Gel Method Using Egg White as Emulsifying Agent - Situmeang, Rudy; Department of Chemistry, University of Lampung, Jl. Prof. Soemantri Brodjonegoro No. 1 Bandar Lampung 35145 (Universitas Gadjah Mada, 2015)