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The present volume, Thorium C5, deals with the compounds of thorium
and sulfur, selenium, tellurium, and boron, as well as with oxoacid
compounds of the three chalcogen elements. Thorium borates have
already been treated in Thorium C2. In contrast to the
corresponding compounds of uranium the thorium sulfides, etc. , do
not show any nuclear or other technological application; they are
only of academic interest, despite some very interest ing
electronic properties, especially of the 1 : 1 compounds. The
thorium-sulfur and the thorium boron systems in particular were
studied in detail, so that we have a clear picture of them, whereas
there are still a lot of open questions in the systems Th-Se and
Th-Te - not very different from other metal chalcogenide systems.
Thorium sulfates are of some technological importance because they
are formed in solution during recovery of thorium from monazite by
sulfuric acid leaching. The very detailed and critical treatment of
the chemical and physical properties of the compounds discussed
also enables us to find gaps still remaining in our knowledge and
thus to initiate new research in this field. I want to thank the
two authors, Dr. Horst Wedemeyer (Karlsruhe) and Dr. David Brown
(Harwell), for their excellent contributions, the
"Literaturabteilung" of the Karlsruhe Nuclear Research Center for
its help in providing reports and other documents difficult to
procure, as well as the staff of the Gmelin-Institute, especially
to Dr. K. -C.
Alloys of Uranium with Alkali Metals, Alkaline Earths, and Elements
of Main Groups III and IV. The description of uranium and its
compounds, for which the Gmelin Institute has started a series of
volumes supplementing the main volume of 1936, follows in its
arrangement closely the order chosen for the transuranium volumes.
Part A treats "The Element," Part B "The Metal and its Alloys,"
Part C "The Compounds," Part D "The Chemistry in Solution," and
finally Part E "The Coordination Compounds." Part E, "The
Coordination Compounds" comprises two volumes which already have
been finished and are available - completely written in English.
Series A comprises 7 volumes which are all available. Series C will
comprise 14 volumes of which only volume 6 is missing. Series D
consists of 4 volumes dealing with the chemistry in solution, which
already have been finished and are available. The present volume
describes the alloys and the intermetallic compounds with the
metals of main groups I to IV - those systems with semimetals such
as boron and germanium are to be found in corresponding volumes in
Uranium C series. In the volume B 2 main emphasis is given to the
binary systems. The most frequently investigated systems are
uranium-beryllium and uranium-aluminium because of their special
scientific (U-Be) and technological (U-Al) importance.
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