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Sc, Y, La-Lu. Rare Earth Elements - Compounds with Boron (Paperback, 8th ed. 1989. Softcover reprint of the original 8th ed. 1989)
Loot Price: R1,637
Discovery Miles 16 370
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Sc, Y, La-Lu. Rare Earth Elements - Compounds with Boron (Paperback, 8th ed. 1989. Softcover reprint of the original 8th ed. 1989)
Series: Gmelin Handbook of Inorganic and Organometallic Chemistry - 8th edition, S-c... / C / 11 / a
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The volume Rare Earth Elements C 11 deals with the compounds and
systems of the rare earth elements with boron, i.e. borides,
borates, and associated alkali double compounds. As in all earlier
volumes of "Rare Earth Elements" Series C (Seltenerdelemente Reihe
C) comparative data are presented in sections preceding treatment
of the individual compounds and systems. Topics of the present
volume C 11 a are the comparative data on the borides and the
individual sections on the systems and borides containing Sc, Y,
and La. The individual sections for the systems and borides with Ce
to Lu can be found in the following volume C 11 b together with the
borates, its alkali double compounds and other compounds containing
Ce to Lu, boron and elements related by the Gmelin system. The most
extensively studied borides treated in the comparative sections are
of the type MB6. These rare earth hexaborides are refractory
compounds and some of them, especially LaB6, are good thermionic
emissive materials or exhibit other interesting physical
properties. The most comprehensive chapter in the individual
sections of volume C 11 a deals with LaB6, which is a well-known
thermionic material of great practical importance with high
electron emission efficiency and an excellent stability in the
surface composition at high temperatures. The effects of
preparation conditions, composition, temperature, surface
structures, surface treatment, and of the atmosphere on the
thermionic emission are studied thoroughly. Another important item
of the LaB6 chapter is the electronic structure, which often serves
as an example for the other rare earth hexaborides.
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