On the growth and properties of single crystal LaB4

Deacon, J. A.; Hiscocks, S. E. R.

doi:10.1007/bf02403097

Cited by 14 publications

(2 citation statements)

References 6 publications

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“…The crystals were prepared according to the method described by Deacon & Hiscocks (1971). The unit-cell dimensions were obtained by the leastsquares method based on the 20 angles measured on a four-circle diffractometer (Rigaku) using monochromated Mo Kc~ radiation (2=0.70926 ./~); they agree with the values reported by Fisk, Cooper, Schmidt & Castellano (1972).…”

supporting

confidence: 66%

Lanthanum tetraboride

Kato¹,

Kawada²,

Oshima³

et al. 1974

Acta Crystallogr Sect B

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supporting

confidence: 66%

Lanthanum tetraboride

Kato¹,

Kawada²,

Oshima³

et al. 1974

Acta Crystallogr Sect B

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“…PrB 4 is the only ferromagnetic tetraboride . LaB 4 seems to have very similar electron emitter qualities to those of LaB 6 …”

Section: Introductionmentioning

confidence: 87%

Calcium TetraborideDoes It Exist? Synthesis and Properties of a Carbon-Doped Calcium Tetraboride That Is Isotypic with the Known Rare Earth Tetraborides

et al. 2006

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Crystalline samples of carbon-doped CaB4 were synthesized by solid-state reactions in sealed niobium ampules from the elements Ca, B, and C. The structure was determined by single-crystal X-ray diffraction (P4/mbm, Z = 4, a = 7.0989(7) A, c = 4.1353(5) A, R1 = 0.026, and wR2 = 0.058) revealing an atom arrangement containing a three-dimensional boron network built up from B6 octahedra and B2 dumbbells which is well-known from the structures of rare earth tetraborides. Crystals of CaB(4-x)Cx are black with a metallic luster and behave stable against mineral acids. Band structure calculations indicate that CaB4 is a stable semiconducting compound with a narrow band gap and that carbon should not necessarily be required for the stability of this compound. The presence of carbon in the crystalline samples of CaB(4-x)Cx was indicated by electron energy loss spectroscopy, but the carbon content in the samples was estimated to be less than 5% according to inductively coupled plasma-atomic emission spectrometry measurements. The distribution of boron and carbon atoms in the structure was investigated by means of 11B and 13C solid-state magic angle spinning NMR. Measurements of the magnetic susceptibility indicate a temperature-independent paramagnetism down to 20 K.

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Lanthanides: Boride, Carbide, and Nitride Compounds

Mori

2012

Encyclopedia of Inorganic and Bioinorganic Chemistry

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Rare earth elements form a rich variety of compounds with boron, carbon, and nitrogen. The rare earth borides, carbides, and nitrides tend to be highly refractory compounds, typically with melting points above 2300 K. One way of looking at the less metal‐rich compounds is that the boron, carbon, and nitrogen atoms, respectively, form strongly covalent atomic networks in which rare earth atoms occupy particular spaces/voids. The strong covalent bonding among the network atoms is the origin for the high temperature stability, while the rare earth elements typically play a critical role in the physical properties, namely, functionalization of the material. For example, especially in the case of boron, boron has one less electron than carbon and therefore it is electron deficient when forming atomic networks compared to carbon networks such as graphite and fullerenes. However, this causes boron to have an especially good affinity with the rare earth elements, which are localized and can occupy voids in the boron network while readily supplying electrons to stabilize novel structures, providing a wide variety of compounds that are introduced in this chapter, together with carbides and nitrides. Furthermore, the shell of f electrons can provide interesting physical properties such as magnetism and luminescence and also provide possible tuning of the electronic properties. In this sense, as functional materials, the rare earth elements play a critical role in the functionalization, although their content may be low in the higher borides, carbides, and nitrides. This is one important direction in which to strive in the current world where natural resources are limited, namely, to highly functionalize materials that are mainly composed of abundant light elements through the innovative use of a small amount of rare element. In this chapter, I briefly review what is known of the rare earth borides, carbides, and nitrides. This review would particularly like to showcase interesting features of the crystal structure and intriguing physical properties ranging from the fundamental to the very applicable, with an emphasis on recent emerging results in important functionalities such as magnetism, thermoelectricity, and superconductivity.

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On the growth and properties of single crystal LaB4

Cited by 14 publications

References 6 publications

Lanthanum tetraboride

Lanthanum tetraboride

Calcium TetraborideDoes It Exist? Synthesis and Properties of a Carbon-Doped Calcium Tetraboride That Is Isotypic with the Known Rare Earth Tetraborides

Lanthanides: Boride, Carbide, and Nitride Compounds

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