Americium
Silicides and borides

Americium monosilicide (AmSi) and "disilicide" (nominally AmSi with: 1.87 < x < 2.0) were obtained by reduction of americium(III) fluoride with elementary silicon in vacuum at 1050 °C (AmSi) and 1150−1200 °C (AmSi). AmSi is a black solid isomorphic with LaSi, it has an orthorhombic crystal symmetry. AmSi has a bright silvery lustre and a tetragonal crystal lattice (space group I 4 /amd), it is isomorphic with PuSi and ThSi. Borides of americium include AmB and AmB. The tetraboride can be obtained by heating an oxide or halide of americium with magnesium diboride in vacuum or inert atmosphere.
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