ESR study of U2centres in BaClF

Abstract

An X irradiation at 78 K, of a BaClF crystal containing OH^- ions leads to the formation of hydrogen atoms in interstitial sites (H_i⁰ or U₂ centres) thermally stable below T approximately 100K. The magnetic properties of the U₂ centres are compared with those observed in the case of U₂ centres in NaCl crystal. The thermal stability is studied and compared with those of the U₂ and U₃(H_s⁰) centres in NaCl.