Acknowledgements
Page: ii-ii (1)
Author: Mikail Aslan and Cengiz Bozada
DOI: 10.2174/9789815124576123010002
The Rare-Earth Elements
Page: 1-29 (29)
Author: Mikail Aslan and Cengiz Bozada
DOI: 10.2174/9789815124576123010003
PDF Price: $15
Abstract
In this section, the elemental forms of rare-earth elements are iron gray to
silvery lustrous metals that are typically soft, malleable, ductile, and usually reactive,
especially at elevated temperatures or when finely divided. rare-earth elements are
examined in terms of physical and chemical properties. This makes them essential
components of diverse defense, energy, industrial, military technology, and low-carbon
technologies. Furthermore, REEs are rapidly being used in magnet applications. For
example, magnets produced by Neodymium-iron, the strongest known type of magnet,
are used widely. Thus, their application areas vary from the electronic to glass industry.
Also, information about the sources of rare-earth elements is given in this part.
The Rare-Earth Hexaborides
Page: 30-42 (13)
Author: Mikail Aslan and Cengiz Bozada
DOI: 10.2174/9789815124576123010004
PDF Price: $15
Abstract
Rare-earth hexaborides (REB6) are composed of rare-earth elements and octahedral 3D boron units. In Chapter 1, rare-earth elements were examined in detail; in this part, the REB6 will be explained. Hence, rare-earth hexaborides (REB6) consisting of rare-earth elements and octahedral bor units are a group of ceramic materials that have a simple cubic structure with Pm3m symmetry. Their low electronic work function, low electrical resistance, and thermal expansion coefficient (in some temperature ranges), as well as high hardness and stiffness, high chemical and thermal stability, and melting points, provide a wide range of industrial uses from metallurgy to electronics.
The Structures of Rare-Earth Hexaborides
Page: 43-62 (20)
Author: Mikail Aslan and Cengiz Bozada
DOI: 10.2174/9789815124576123010005
PDF Price: $15
Abstract
The structures of rare-earth hexaborides can be nanoparticles, nanowires, nanotubes, nanorods, nano-obelisks, nanocubes, nanocrystals and nanocons. These types of structures indicate superior properties, such as excellent mechanical, electronic, and optical properties. For these reasons, they are used in thermionic materials, electrical coating for resistors, sensors, and high-energy optical systems. Furthermore, their low work functions make them special for the design of optical devices, such as a cathode substance for cold (field) emission
The Rare-Earth Hexaborides Production Methods
Page: 63-80 (18)
Author: Mikail Aslan and Cengiz Bozada
DOI: 10.2174/9789815124576123010006
PDF Price: $15
Abstract
To produce rare-earth hexaborides, some methods exist: direct solid phase,
carbothermal reduction, borothermal reduction, self-propagating synthesis, aluminum
flux method, spark plasma sintering, and mechanochemical synthesis, floating zone
method, and chemical vapor deposition. In this section, the drawbacks and advantages
of these production methods will be discussed.
The Rare-Earth Hexaboride-Based Alloys
Page: 81-93 (13)
Author: Mikail Aslan and Cengiz Bozada
DOI: 10.2174/9789815124576123010007
PDF Price: $15
Abstract
The rare-earth hexaboride can be both alloyed with alkaline earth hexaboride
and rare-earth hexaborides. Both alloying types have different types of advantages. For
example, large-size triple LaxCe1-xB6
single crystals produced by the floating zone
method showed excellent field emission and thermionic emission characteristics. Thus,
these types of alloys indicate superior performance (electronic, magnetic, excellent
field emission, thermionic emission properties) when compared to their pure
counterparts.
The Rare-Earth Hexaboride Based Composites
Page: 94-118 (25)
Author: Mikail Aslan and Cengiz Bozada
DOI: 10.2174/9789815124576123010008
PDF Price: $15
Abstract
Rare-Earth metal hexaborides (REB6) can be composited with some kind of ceramics, such as SiC, MgO, Carbon Nanotube, and Alumina. These types of composites can show excellent mechanical, optical, and thermionic properties. For example, SiC ceramics have high condensation behavior, high corrosion resistance, high thermal shock resistance, and high hardness properties; MgO ceramics have high fire resistance, high thermal conductivity, and low electrical conductivity properties; Carbon nanotubes have high optical and mechanical properties and Al2O3 ceramics have high abrasion and corrosion resistance and low density. The sizes of these materials are also significant as nano, and micro-sized ceramic materials have different properties when forming a composite with REB6 or any materials.
Conclusion
Page: 119-119 (1)
Author: Mikail Aslan and Cengiz Bozada
DOI: 10.2174/9789815124576123010009
Subject Index
Page: 120-125 (6)
Author: Mikail Aslan and Cengiz Bozada
DOI: 10.2174/9789815124576123010010
Introduction
Rare-earth hexaborides are a group of materials composed of octahedral boron units. They are useful for making advanced ceramics that have a wide range of industrial applications due to their low electronic work functions, hardness, refractory properties, low electrical resistances and specific thermal expansion coefficients. Rare-Earth Metal Hexaborides: Synthesis, Properties, and Applications provides a quick reference on rare-earth metal hexaborides and their engineering applications. It provides a primer on rare earth elements followed by details of rare-earth hexaboride structures, synthetic methods, and information about their alloys and ceramic composites. References to scholarly research are also provided for assisting advanced readers. This reference is a handy source of information for chemical engineering and materials science scholars, and anyone interested in the applied chemistry of rare-earth metals and borides.