Preparation and Some Properties of ScB₂ Single Crystals.

Abstract

Scandium I 2500Preparation and Some Properties of ScB 2 Single Crystals. -Single crystals of the title compound are synthesized by inductive floating zone melting using Sc2O3 and boron as starting materials. As revealed by single crystal and powder XRD ScB2 crystallizes in the hexagonal space group P6/mmm (AlB2-type structure) with Z = 1. Ultrasound measurements reveal a Young modulus of 480 GPa and a Debye characteristic temperature of 1020 K for the compound. -(LEVCHENKO*, G.; LYASHCHENKO, A.; BAUMER, V.; EVDOKIMOVA, A.; FILIPPOV, V.; PADERNO, Y.; SHITSEVALOVA, N.; J. Solid State

Preparation and Properties of Metallic, Superhard Rhenium Diboride Crystals

“…Similarly, Lyashchenko et al reported a Vickers hardness of 37.2 GPa under a load of 0.98 N for zonemelted ReB 2 compared to the 36.2 GPa obtained here for the (002) plane of flux-grown ReB 2 under an equivalent load. 18 Part of the decrease in hardness can be attributed to the boron-deficient structure of the flux-grown crystals. Additionally, the smaller lattice parameters presented above suggest a higher vacancy of boron atoms compared to arc-melted ReB 2 (a ) 2.900, c ) 7.478).…”

“…[11][12][13][14][15][16][17] To date, ReB 2 crystals have been synthesized by arc melting, by zone melting, and using an optical floating zone furnace. 9,18,19 However, an extended study of the physical properties of ReB 2 has not been performed.…”

“…Recently, thin films of ReB 2 were prepared by pulsed laser deposition that were also shown to be superhard . Since our initial publication, there have been several theoretical studies reported on the electrical, thermal, and rheological properties of ReB 2 to better understand this material’s unique combination of properties. − To date, ReB 2 crystals have been synthesized by arc melting, by zone melting, and using an optical floating zone furnace. ,, However, an extended study of the physical properties of ReB 2 has not been performed.…”

Advancements in the Search for Superhard Ultra‐Incompressible Metal Borides

“…[68,69] Additionally, several theoretical studies have reported on the electrical, thermal, and rheological properties of ReB 2 in an effort to better understand this material's unique combination of properties. [54,[70][71][72][73][74][75] The use of single crystals is clearly necessary to experimentally verify these results because many of the properties are altered by grain boundaries in polycrystalline samples.…”

Hexagonal OsB2: Sintering, microstructure and mechanical properties

“…The synthesis and discovery of novel metastable ceramic compounds is of major importance both from a fundamental science point of view and in advancing industrial applications. Borides are an important class of the ceramic materials exhibiting many unique properties [10][11][12][13][14][15][16][17][18][19][20][21][22] and, therefore, much research has been performed to design and develop new boride compositions by different routes [13,14,[23][24][25][26][27][28][29][30][31][32]. Recently, the mechanochemical synthesis of hexagonal ReB 2 -type OsB 2 ceramics has been reported [33][34][35].…”