Protactinium magnetic susceptibility

The magnetic susceptibility of protactinium tetrachloride has been measured between 3.2 and 296 K [25], as shown in Table 18.3, and exhibits a ferromagnetic transition at 182 2 K. A high degree of co valency has been suggested to explain this relatively high transition temperature. The magnetic susceptibility of protactinium tetraformate [26] has been measured from 80 to 300 K and follows... 

The susceptibility of tetrakis(cyclopentadienyl)protactinium has been measured between 4.2 and 300 K [18]. Above 90 K the magnetic susceptibility obeys the Curie-Weiss law with 0 = — 8.6 K, and the magnetic moment at room temperature is 0.725 p. A J = 5/2 state will split into at most three Kramers doublet levels, and in this compound it is reported that the first two levels are separated by approximately 15-30 cm and that the third level is at about 600 cm. J mixing cannot explain the low magnitude of the magnetic moment... 

Protactinium see also Elements electrical resistivity, 12-39 to 40 electron configuration, 1-18 to 19 heat capacity, 4-135 history, occurrence, uses, 4-1 to 42 ionization energy, 10-203 to 205 isotopes and their properties, 11-56 to 253 magnetic susceptibility, 4-142 to 147 physical properties, 4-133 to 134 thermal properties, 12-201 to 202 vapor pressure, high temperature, 4-136 to 137... 

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