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allotropes of plutonium
Plutonium occurs in a variety of allotropes, even at ambient pressure. These allotropes differ widely in crystal structure and density; the α and δ allotropes differ in density by more than 25% at constant pressure.
==Overview==
Plutonium normally has six allotropes and forms a seventh (zeta, ζ) under high temperature and a limited pressure range.〔 These allotropes have very similar energy levels but significantly varying densities and crystal structures. This makes plutonium very sensitive to changes in temperature, pressure, or chemistry, and allows for dramatic volume changes following phase transitions.〔
〕 Unlike most materials, plutonium ''increases'' in density when it melts, by 2.5%, but the liquid metal exhibits a linear decrease in density with temperature. Densities of the different allotropes vary from 16.00 g/cm3 to 19.86 g/cm3.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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