A Study of Some Binary Hafnium Compounds

Glaser, Frank W.; Moskowitz, D.; Post, B.

doi:10.1007/bf03397598

Cited by 21 publications

(21 citation statements)

References 6 publications

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“…The successful synthesis of metal borides using powders of pure metals and amorphous or crystalline boron via arc-melting includes such classes of borides as: 1) Lower metal borides and their alloys, e.g., TiB; [122] W 1−x Ta x B; [293] [51,268] and ZrB 12 ; [268,332] 4) β-rhombohedral boron [311] and its transition metal doping phases (HfB 50 , ScB 50 ); [50,55] and 5) YPtB 50 ; [388] Another common boride synthesis technique is hot-pressing of mixtures of transition metal and boron powders; using this method boride tools can also be readily made. [56,130,389] In addition this technique can be used to make metal boride composites with other compounds, such as a TiB 2 -B 4 C composite. [127] High-frequency induction furnace melting of sintered samples can be used to synthesize metal borides, especially in single-crystal form.…”

Section: ) Carbothermal Reduction (Reduction Of Metal Oxides and Bormentioning

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: ) Carbothermal Reduction (Reduction Of Metal Oxides and Bormentioning

confidence: 99%

Rediscovering the Crystal Chemistry of Borides

2017

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“…4, left). This arrangement may be viewed as layered sections of the rocksalt-type structure of the binary nitrides MN [57,58] (see Fig. 6, left), which are separated by halide double layers and stacked along the [001] direction [2].…”

Section: Crystal Structures and Properties Of The Prototypic Mnx Compmentioning

confidence: 99%

Superconducting nitride halides MNX (M = Ti, Zr, Hf; X = Cl, Br, I)

Schurz

Shlyk

Schleid

et al. 2011

Zeitschrift Für Kristallographie

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Abstract. Two different polymorphs of the metal nitride halides MNX (M ¼ Ti, Zr, Hf; X ¼ Cl, Br, I) are known to crystallize in layered structures. The two crystal structures differ in the way 2 1 {X[M 2 N 2 ]X} slabs are stacked along the c-axes. Metal atoms and/or organic molecules can be intercalated into the van-der-Waals gap between these layers. After such an electron-doping via intercalation the prototypic band insulators change into superconductors with moderate high critical temperatures T c up to 25.5 K. This review gathers information on synthesis routes, structural characteristics and properties of the prototypic nitride halides and the derivatives after electron-doping with a focus on superconductivity.

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“…Cubic phase (C 11 , C 44 , and C 12 ) and for hexagonal phase are [19]: Hexagonal phase (C 11 , C 33 , C 44 , C 12 , and C 12 ) experimental data (a = 4.62 Å for NaCl-type HfB [5] and a = 2.876 Å, c = 2.871 Å for WC-type OsB [7]). Some differences between theoretical results (a = 3.006 Å, c = 2.692 Å for WC-type IrB and a = 3.760 Å, c = 3.569 Å for anti-NiAs-type PtB) and experimental data (a = 2.851 Å, c = 2.823 Å for WC-type IrB [7] and a = 3.358 Å, c = 4.058 Å for anti-NiAs-type PtB [8] and a = 3.3445 Å, c = 4.0645 Å for anti-NiAs-type PtB [21]) are found for IrB and PtB.…”

Section: Resultsmentioning

confidence: 99%

“…Through the insertion of light elements into transition metals, the non-directional metallic bonding changes to highly directional covalent bonding, creating high hardness. For 4d and 5d transition metal monoborides, the experimental studies indicated that ZrB [4] and HfB [5] were synthesized in NaCl-type structure, RuB [6], OsB [7] and IrB [7] in hexagonal WC-type structure, as well as RhB and PtB in anti-NiAs-type structure [8]. In addition, the theoretical studies on WB, IrB, ReB and OsB with WC-type structure and ReB with NaCl, CsCl, WC, NiAs and antiNiAs-type structures were performed [9,10].…”

Section: Introductionmentioning

confidence: 98%