Structure refinements of iron borides Fe<sub>2</sub>B and FeB

Kapfenberger, Christine; Albert, Barbara; Pöttgen, Rainer; Huppertz, Hubert

doi:10.1524/zkri.2006.221.5-7.477

Cited by 56 publications

(29 citation statements)

References 13 publications

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“…The prisms containing a boron atom form an infinite column of prisms and share two faces (rectangular) with nearby prisms. [290] LiB x is an interesting example of a boride with linear chains of boron (containing a borynide chain [B -] n ), which is isoelectronic to carbyne (Table 2). [7] …”

Section: Borides With Ordinary Chains Of Boron Atomsmentioning

confidence: 99%

“…A boron-rich boride of sodium, Na 2 B 29(mono) , also belongs to this class (Table 2). [14] For the AlB 12(tetr) (Figure 18 [290] and (middle) Ni 3 B (ICSD 409893, Fe 3 C (ortho) structure). [238] ICSD -Inorganic Crystal Structure Database.…”

Section: Borides With Boron Icosahedra (B 12 ) Unitsmentioning

confidence: 99%

“…Cr 2 B possesses isolated boron atoms, which fill the parent metal structure voids, while the metal atoms are arranged in square antiprisms; this structure also possesses the longest B-B bonds related to other metal boride phases (Figure 2). [290] In o-Mn 2 B, eight Mn atoms are arranged in an archimedean antiprism, which surrounds each boron atom. [191] For the F 3 C structure, the boron atoms are located in threefoldly capped trigonal prisms formed by the metal atoms, which are situated at the centers of 15-and 14-vertices polyhedra (Figure 2).…”

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confidence: 99%

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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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Section: Borides With Ordinary Chains Of Boron Atomsmentioning

confidence: 99%

Section: Borides With Boron Icosahedra (B 12 ) Unitsmentioning

confidence: 99%

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confidence: 99%

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Rediscovering the Crystal Chemistry of Borides

2017

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“…Die Metallatom-Prismen sind dreifach überdacht von Boratomen. Handelte es sich um nur zweifach mit Boratomen überdachte Prismen, resultierte eine Zickzack-Kette aus Boratomen (wie im FeB [299] [300] Überraschenderweise fanden Burckhardt et al für Aluminiumdiborid, dass diese Verbindung grundsätzlich eine etwa 10-proz. Unterbesetzung auf der Metallatom-Position aufweist, also eher als Al 0.9 B 2 zu bezeichnen ist.…”

Section: Bor Und Borideunclassified

Bor – elementare Herausforderung für Experimentatoren und Theoretiker

Albert

Hillebrecht

2009

Angewandte Chemie

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Auch mehr als zweihundert Jahre nach der Entdeckung des Elementes Bor gibt es auf viele grundlegende Fragen in der Festkörperchemie von Bor noch keine eindeutigen Antworten. In jüngster Zeit zeigten theoretische Arbeiten zur Stabilität und Existenz bekannter und neuer Modifikationen des Elements in Verbindung mit Hochdruck‐ und Hochtemperaturexperimenten neue Aspekte. Auch auf dem Gebiet der Reaktionen von Bor mit Hauptgruppenelementen hat sich in den letzten Jahren viel getan. Aufsehen haben binäre Verbindungen wie B6O, MgB2, LiB1−x, Na3B20 oder CaB6 erregt, aber auch die elektronenpräzisen, farblosen Boridcarbide Li2B12C2, LiB13C2 und MgB12C2 sowie Graphit‐analoges BeB2C2 verdienen besonderes Augenmerk. Physikalische Eigenschaften wie Härte, Supraleitfähigkeit, Neutroneneinfangquerschnitt und Thermoelektrizität machen borreiche Verbindungen auch für Materialforschung und Anwendung attraktiv. Die größten wissenschaftlichen Herausforderungen bestehen jedoch weiterhin in der Synthese einphasiger Produkte in makroskopischen Mengen und in Form von Einkristallen, in der zweifelsfreien Identifizierung und Bestimmung von Zusammensetzung und Kristallstruktur sowie im Verständnis der elektronischen Situation. Verknüpfte Polyeder sind das dominierende Strukturelement in borreichen Verbindungen der Hauptgruppenelemente. In vielen Fällen leiten sich deren Strukturen von denen ab, die den Elementmodifikationen zugeschrieben werden. Auch diese bedürfen allerdings einer neuen, kritischen Durchsicht und Diskussion.

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“…Interatomic distances in Table 3 show that boron-boron distances, d B-B = 0.188 nm, in Ta 0.78 Zr 0.22 B appear somewhat increased with respect to the boron chain in binary FeB with significantly smaller metal (Fe) atoms: d B-B = 0.1785 nm (from x-ray SC data; [23] or d B-B = 0.1783 nm, from unpolarized neutron diffraction SC data [24] ). Bonds from B to the six Ta/Zr atoms within the trigonal prisms are rather homogeneous, 0.240 nm < d B-Ta/ Zr < 0.243 nm, and are close to the sum of radii (R Ta = 0.1467 nm, R Zr = 0.1602, R B = 0.088 nm [25] ) documenting a strong metal-boron interaction.…”

Section: Formation Of Feb-type Compounds In the Systemsmentioning

confidence: 99%

High Temperature FeB-type Phases in the Systems Ta-{Ti,Zr,Hf}-B

Failamani

Göschl

Reisinger

et al. 2015

J. Phase Equilib. Diffus.

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Novel FeB-type phases have been evaluated in the systems Ta-{Ti,Zr,Hf}-B either from as cast or arc treated samples by x-ray powder and single crystal diffraction as well as electron probe microanalysis. In each of the three systems the formation of the FeB-type phase suggests a high temperature stabilization of a binary group IV metal monoboride with FeB-type. This holds true for Ti and Hf, while for Zr the single crystal study of (Ta,Zr)B proves that it is a true ternary phase, as no stable monoboride exists in the binary Zr-B system. EPMA analyses reveal that the FeB-type phases Ta{Ti,Zr,Hf}B are formed by substitution of Ta in TaB by rather small amounts of group IV elements ($3 at.% of Zr, $7 at.% Hf, and $10 at.% Ti).

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Structure refinements of iron borides Fe₂B and FeB

Abstract: Crystals of the iron borides FeB and Fe

Cited by 56 publications

References 13 publications

Rediscovering the Crystal Chemistry of Borides

Rediscovering the Crystal Chemistry of Borides

Bor – elementare Herausforderung für Experimentatoren und Theoretiker

High Temperature FeB-type Phases in the Systems Ta-{Ti,Zr,Hf}-B

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Structure refinements of iron borides Fe2B and FeB

Abstract: Crystals of the iron borides FeB and Fe

Cited by 56 publications

References 13 publications

Rediscovering the Crystal Chemistry of Borides

Rediscovering the Crystal Chemistry of Borides

Bor – elementare Herausforderung für Experimentatoren und Theoretiker

High Temperature FeB-type Phases in the Systems Ta-{Ti,Zr,Hf}-B

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Structure refinements of iron borides Fe₂B and FeB