ISSN:
1573-9171
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract The formation and stabilization of hole and electron centers at 77 K in γ-irradiated polycrystalline samples of Ba(OH)2·H2O, where x=7.4, 1, and O are studied. Several types of O− radical ions with different short-range order, electronic centers of the FA-center type, and hydrogen atoms are shown to be stabilized upon radiolysis of barium hydroxide crystal hydrates. The radiation-chemical yields of 0” radical ions increase and the yields of FA-centers decrease with increasing content of water of crystallization. Narrow singlets with g=2.019 and ΔH1/2=0.45 mT in the EPR spectrum of all samples appear with small radiation doses. These are thermally unstable (τ1/2=60 sec at 77 K). The annealing curves are linear in semilogarithmic coordinates. They are suggested to belong to clusters of the type Ba n 2n-x . A possible mechanism of radiolysis of barium hydroxide crystal hydrates is proposed.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00962093
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