SYNTHESIS OF A NEW MOSSBAUER ABSORBER

A method is developed for preparing Mg paraperiodate that consists of the oxidation by ozone of elemental I2 to iodic acid with subsequent p reparation of Mg(IO3)2 and thermal decomposition of it to Mg5(IO6)2. T his method enables semimicrogram quantities of the compound to be used and is directed toward the preparation of a I-129 Moessbauer absorber . X-ray structural data are presented for Mg iodate and paraperiodate. A sample of formula 19MgO.Mg5(IO6)2 is prepared. Preliminary Moessbau er measurements with a source 2MgO.(Mg3TeO6)-Te-129m suggest that the paraperiodate has a singlet absorption and a relatively large Debye-Wa ller factor that depends weakly on temperature.