Abstract
Pressure-induced transitions in lanthanum, uranium and thorium were investigated by measuring the room temperature thermoelectric power ( S) of these elements in the pressure range zero to one hundred kbar in a Bridgman anvil apparatus. In lanthanum two isostructural electronic transitions that are precursors to the structural changes at 23 kbar and 62 kbar are observed. Subtle electronic transitions are observed in uranium and thorium at 43 kbar and 30 kbar respectively. A schematic phase diagram of lanthanum and its similarity to that of uranium is discussed.
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