Kerapatan, Kekerasan dan Koefisien Muai Panas Membran Penghantar Ion Oksigen LaCo0,8Fe0,2O3-δ Tersubstitusi Ca2+(La1-xCaxCo0,8Fe0,2O3-δ) - Fansuri, Hamzah (Dept. of Chemical Engineering, Diponegoro University, 2016)