TETRAGONAL ZrO2 - Y2O3 PART I : PREPARATION METHODS AND CHARACTERIZATION A.J.A. WINNUBST, M.A.C.G. VAN DE GRAAF, K. KEIZER et A.J. BURGGRAAF J. Phys. Colloques, 47 C1 (1986) C1-569-C1-573 DOI: 10.1051/jphyscol:1986186