The Crystal Structure of CrB4.

Andersson, Sven; Lundström, Torsten; Andresen, Arne F.; Pearson, W. B.

doi:10.3891/acta.chem.scand.22-3103

Cited by 83 publications

(44 citation statements)

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“…The unit cell contains three independent atoms: one M(1) atom in the (0, 0, 0) position at the center of inversion and two boron atoms, B(1) and B(2) in the 4g position. The major difference from the Immm structure (used by Andersson and Lundstroem [29] to describe the CrB 4 structure) is a distortion of the threedimensional boron network [ Fig. 1(b)].…”

Section: A Crystal Structurementioning

confidence: 99%

Peierls distortion, magnetism, and high hardness of manganese tetraboride

et al. 2014

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We report crystal structure, electronic structure, and magnetism of manganese tetraboride, MnB 4 , synthesized under high-pressure, high-temperature conditions. In contrast to superconducting FeB 4 and metallic CrB 4 , which are both orthorhombic, MnB 4 features a monoclinic crystal structure. Its lower symmetry originates from a Peierls distortion of the Mn chains. This distortion nearly opens the gap at the Fermi level, but despite the strong dimerization and the proximity of MnB 4 to the insulating state, we find indications for a sizable paramagnetic effective moment of about 1.7 μ B /f.u., ferromagnetic spin correlations, and, even more surprisingly, a prominent electronic contribution to the specific heat. However, no magnetic order has been observed in standard thermodynamic measurements down to 2 K. Altogether, this renders MnB 4 a structurally simple but microscopically enigmatic material; we argue that its properties may be influenced by electronic correlations.

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Section: A Crystal Structurementioning

confidence: 99%

Peierls distortion, magnetism, and high hardness of manganese tetraboride

et al. 2014

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“…[304] In CrB 4(ortho) (Figure 15) the structural type is similar to UB 4(tetr) in the sense that the boron atoms form three dimensional nets, penetrated by channels of chromium atoms along the c direction. [168,170] The squares of boron atoms, parallel to the (001) plane along the c direction are connected into zig-zag layers by boron-boron bonds (1.91 Å). [169] By deforming the CrB 4(ortho) unit cell in the c-axis direction, an MnB 4(mono) cell can be created ( Figure 15).…”

Section: Borides With a Skeleton/backbone Of Boron Atomsmentioning

confidence: 99%

Rediscovering the Crystal Chemistry of Borides

2017

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For decades, borides have been primarily studied as crystallographic oddities. With such a wide variety of structures (a quick survey of the Inorganic Crystal Structure Database counts 1253 entries for binary boron compounds!), it is surprising that the applications of borides have been quite limited despite a great deal of fundamental research. If anything, the rich crystal chemistry found in borides could well provide the right tool for almost any application. The interplay between metals and the boron results in even more varied material's properties, many of which can be tuned via chemistry. Thus, the aim of this review is to reintroduce to the scientific community the developments in boride crystal chemistry over the past 60 years. We tie structures to material properties, and furthermore, elaborate on convenient synthetic routes toward preparing borides.

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“…[6] At the other end of the compositional scale, metal clusters with interstitial boron atoms have been identified which have the local bonding environment of boron in metal-rich borides. [7] However, the borides of intermediate compositions, for example, CrB 4 [8] , find no models in the molecular world. To date there has been no need to invoke a comparison as nearly all known metallaboranes contain late transition metal fragments and follow the same structural paradigm as the boranes.…”

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confidence: 99%