Plutonium borides


Plutonium borides

At least four borides can be formed by direct combination of plutonium and boron powders in an inert atmosphere at reduced pressure.

PuB is formed at 1200C with a range 40-70%at boron, and has the NaCl structure, as do TiB, ZrB and HfB, with a Pu-B bond length of 2.46A.

PuB2 is formed at 800C in at least the range 60-65%at boron, and has the structure of AlB2, as does UB2.

At 1200C with 70-85%at boron, mixtures of PuB4 and PuB6 are formed, with more of the latter as the temperature increases; PuB4 has the UB4 structure tetragonal, and PuB6 the CaB6 cubic one (isomorphous with ThB6).

[cite journal | title=The crystal structures of some plutonium borides |author=B J McDonald |coauthors=W I Stuart| journal=Acta Cryst. |year=1960 |volume=13 |pages=447-448]

References


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Boride — In chemistry a boride is a chemical compound between boron and a less electronegative element. This is a very large group of compounds that are generally high melting and are not ionic in nature. Some borides exhibit very useful physical… …   Wikipedia

  • Plutoniumboride — Struktur des PuB2 Die Plutoniumboride sind eine Stoffgruppe von Verbindungen, die aus den Elementen Bor und Plutonium bestehen. Die bis heute 4 bekannten Plutoniumboride bilden sich durch direkte Reaktion beider Elemente (Bor in Pulverform) unter …   Deutsch Wikipedia

  • Americium — Eigenschaften …   Deutsch Wikipedia

  • Leo Brewer — Infobox Scientist name = Leo Brewer |50px caption = Leo Brewer in 1948 birth date = June 13 1919 birth place = St. Louis,Missouri death date = February 22 2005 (aged 85) death place = Lafayette, California residence = Berkeley, California… …   Wikipedia

  • Samarium — promethium ← samarium → europium ↑ Sm ↓ …   Wikipedia