The electrical resistivity and specific heat of samples of 241Am and 243Am are reported. The electrical resistivity at room temperature is reduced compared with the value for plutonium, while the power law exponent at low temperatures is increased. The electronic specific heat coefficient is lower than for the lighter actinides. These features lead to the conclusion that americium is the first of the actinides in which the 5 f electrons are essentially localized. Anomalies occur in the electrical resistivity and in the specific heat in the region of 60 K, the cause of which is unknown.
High‐pressure X‐ray diffraction studies have been performed on ThC powder up to 36 GPa. No structural phase transformation has been observed, the rock‐salt structure of ThC being stable over the whole pressure range. The equation of state can be described by the Murnaghan equation with the bulk modulus B0 = 109(7) GPa and its pressure derivative B′0 = 3.1(6). The high‐pressure behaviour of ThC is compared with that of other actinide carbides and nitrides and correlated with the occupation of the 5f electron shell.
Experimental high-pressure X-ray diffraction studies have been performed on ThN powder for pressures up to 47 GPa using synchrotron radiation and a diamond anvil cell. The bulk modulus Bo and its pressure derivative B~ have been determined: Bo = 175(15) GPa and B~ = 4.0(4). No structural phase transition has been found in contrast to UN studied previously.
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