Editing Americium (section)

===Silicides and borides===
Americium [[silicide|monosilicide]] (AmSi) and "disilicide" (nominally AmSi<sub>x</sub> with: 1.87 < x < 2.0) were obtained by reduction of americium(III) fluoride with elementary [[silicon]] in vacuum at 1050&nbsp;°C (AmSi) and 1150−1200&nbsp;°C (AmSi<sub>x</sub>). AmSi is a black solid isomorphic with LaSi, it has an orthorhombic crystal symmetry. AmSi<sub>x</sub> has a bright silvery lustre and a tetragonal crystal lattice (space group ''I''4<sub>1</sub>/amd), it is isomorphic with PuSi<sub>2</sub> and ThSi<sub>2</sub>.<ref>{{cite journal|last1=Weigel|first1=F.|last2=Wittmann|first2=F.|last3=Marquart|first3=R.|title=Americium monosilicide and "disilicide"|journal=Journal of the Less Common Metals|volume=56|page=47|date=1977|doi=10.1016/0022-5088(77)90217-X}}</ref> [[Boride]]s of americium include AmB<sub>4</sub> and AmB<sub>6</sub>. The tetraboride can be obtained by heating an oxide or halide of americium with [[magnesium diboride]] in vacuum or inert atmosphere.<ref>Lupinetti, A. J. ''et al''. {{US patent|6830738}} "Low-temperature synthesis of actinide tetraborides by solid-state metathesis reactions", Filed 4 Apr 2002, Issued 14 December 2004</ref><ref>{{cite journal|last1=Eick|first1=Harry A.|last2=Mulford|first2=R. N. R.|title=Americium and neptunium borides|journal=Journal of Inorganic and Nuclear Chemistry|volume=31|page=371|date=1969|doi=10.1016/0022-1902(69)80480-X|issue=2}}</ref>