EFFECTS ON PRESSURE ON THE SPECTRA, LIFETIMES AND ENERGY TRANSFER OF Eu P5O14, Tb P5O14 AND Eu1-xTbxP5O14 B. Blanzat, N. Tercier, J.P. Denis et C. Barthou J. Phys. Colloques, 45 C8 (1984) C8-71-C8-74 DOI: 10.1051/jphyscol:1984814