LOCAL ENVIRONMENT OF Zr IN BARYUM FLUOROZIRCONATE GLASSES : THE EXAFS POINT OF VIEW B. BOULARD, A. LE BAIL, J.P. LAVAL et C. JACOBONI J. Phys. Colloques, 47 C8 (1986) C8-791-C8-794 DOI: 10.1051/jphyscol:19868151