Room-temperature synthesis of metal borides

Kapfenberger, Christine; Hofmann, Kathrin; Albert, Barbara

doi:10.1016/s1293-2558(03)00117-1

Cited by 41 publications

(48 citation statements)

References 18 publications

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“…Annealing the precipitates of borides above 300 °C transforms the disordered structure into crystalline Ni 3 B. [315] Unfortunately, the disorder obscures the role of boron toward catalytic activity; ostensibly, the high metal content is responsible for the catalytic activity. More recently, it has been hypothesized that boron may provide a stabilizing role against sintering.…”

Section: Catalysismentioning

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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Section: Catalysismentioning

confidence: 99%

Rediscovering the Crystal Chemistry of Borides

2017

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“…[40] Nanoparticles of metal borides are less amenable to synthesis than, for example, sulfides, since borides cannot normally be obtained from solution and precipitated at low temperatures (exception in Ref. [41]). We shall discuss selected work which has described nanoboron and nanoborides.…”

Section: àmentioning

confidence: 99%

Boron: Elementary Challenge for Experimenters and Theoreticians

Albert¹,

Hillebrecht²

2009

Angew Chem Int Ed

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558

436

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Many of the fundamental questions regarding the solid-state chemistry of boron are still unsolved, more than 200 years after its discovery. Recently, theoretical work on the existence and stability of known and new modifications of the element combined with high-pressure and high-temperature experiments have revealed new aspects. A lot has also happened over the last few years in the field of reactions between boron and main group elements. Binary compounds such as B(6)O, MgB(2), LiB(1-x), Na(3)B(20), and CaB(6) have caused much excitement, but the electron-precise, colorless boride carbides Li(2)B(12)C(2), LiB(13)C(2), and MgB(12)C(2) as well as the graphite analogue BeB(2)C(2) also deserve special attention. Physical properties such as hardness, superconductivity, neutron scattering length, and thermoelectricity have also made boron-rich compounds attractive to materials research and for applications. The greatest challenges to boron chemistry, however, are still the synthesis of monophasic products in macroscopic quantities and in the form of single crystals, the unequivocal identification and determination of crystal structures, and a thorough understanding of their electronic situation. Linked polyhedra are the dominating structural elements of the boron-rich compounds of the main group elements. In many cases, their structures can be derived from those that have been assigned to modifications of the element. Again, even these require a critical revision and discussion.

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“…Nanopartikel von Metallboriden sind einer Synthese weniger leicht zugänglich als beispielsweise Sulfide, da Boride im Normalfall nicht aus Lösung erhalten und bei niedrigen Temperaturen präzipitiert werden können (Ausnahme in Lit. [41]). Wir diskutieren unten ausgesuchte Arbeiten, in denen Nanobor und Nanoboride beschrieben wurden.…”

Section: Introductionunclassified

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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Room-temperature synthesis of metal borides

Cited by 41 publications

References 18 publications

Rediscovering the Crystal Chemistry of Borides

Rediscovering the Crystal Chemistry of Borides

Boron: Elementary Challenge for Experimenters and Theoreticians

Bor – elementare Herausforderung für Experimentatoren und Theoretiker

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