In situ synchrotron X-ray diffraction study of the formation of TaB2 from the elements in a laser heated diamond anvil cell

Elastic stability and electronic structure of tantalum boride investigated via first-principles density functional calculations

“…TaB has the similar mechanical and chemical prosperities with other borides of tantalum metals such as TaB 2 , Ta 3 B 4 , Ta 2 B and Ta 5 B 6 [1,20,31]. The obtained bulk modulus B 0 of TaB is close to the data from TaB 2 by Winkler et al [32]. From Zhao et al [17], they calculated the bulk modulus of hexagonal (P6 3 /mmc) structure TaB were 291 GPa (LDA) and 267 GPa (GGA), respectively.…”

In situ study of the formation of rhenium borides from the elements at high-(p, T) conditions: Extreme incompressibility of Re7B3 and formation of new phases

“…A PBE-GGA value computed by Ref. [27] is slightly lower (378 GPa), which is also expected according to experience [33,15]. In contrast to the results for Re 3 B, for Re 7 B 3 the DFT model is elastically stable.…”

“…Small pieces of rhenium foil (Aldrich Chemical, purity 99.98%) with a thickness of 25 mm and boron powder (w325 mesh, Alpha Aesar, 98 %) were used as starting materials. Both materials had been characterized earlier [33,15]. The samples were pressurized in BoehlereAlmax diamond anvil cells and were double sided laser heated with fiber lasers.…”

Synthesis of Binary Transition Metal Nitrides, Carbides and Borides from the Elements in the Laser-Heated Diamond Anvil Cell and Their Structure-Property Relations

“…We have shown that on laser heating a sample of tantalum foil and boron powder at pressures of 12–24 GPa and temperatures of 1600–2000 K tantalum and boron reacted immediately, already after a brief irradiation with a weak laser beam, and that pure tantalum was not present any more in the sample. The same synthesis product, TaB${}_2$ (AlB${}_2$-type, $P6/mmm$, a = 3.1018(2) Å, c = 3.2836(4) Å) as a single stable phase, was observed independently of the pressure (11.9 or 23.7 GPa) or the temperature used (laser heating with different laser power was attempted) (Figure 18, left) [147]. …”

“…Only one synthesis experiment has been published in a laser-heated DAC, namely the synthesis of TaB by our group [ 147 ]. Two further synthesis experiments in the Ti-B and Re-B systems have been successful and will be discussed here.…”