Phase equilibria in tantalum ? Titanium ? Boron and tantalum ? Molybdenum ? Boron systems

Sobolev, Arkadij; Kuz’ma, Yu. B.; Soboleva, T. E.; Fedorov, T. F.

doi:10.1007/bf00776109

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…30 This behavior is in contrast to such diborides such as TaB 2 and MoB 2 in which a wide homogeneity region was reported. 31 The enlarged value for the displacement parameter of Tm is caused by anisotropy ͑B 33 ӷ B 11 ͒. The anisotropy may correlate with the defects in the boron sublattice.…”

Section: Synthesis Methods and Crystal Structurementioning

confidence: 99%

Ferromagnetism and electronic structure ofTmB2

et al. 2009

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The magnetic properties and electronic structure of thulium diboride were investigated as it is a magnetically unknown phase between ferromagnetic ͑FM͒ REB 2 ͑RE =Tb,Dy,Ho,Er͒ and antiferromagnetic YbB 2. TmB 2 adopts the AlB 2-type crystal structure ͑P6 / mmm͒ with a = 3.26016͑5͒ Å and c = 3.75351͑8͒ Å and exhibits long-range FM order with the specific heat C p exhibiting a peak at T C = 7.2 K at the Curie temperature. A Curie-Weiss fit of the magnetic susceptibility yielded eff = 7.49 B / Tm ͑Tm 3+ ͒ and weak FM interactions. A Schottky anomaly in C p was used to investigate crystal electric field ͑CEF͒ effects. From a measurement of C p ͑T͒ of the isostructural LuB 2 the magnetic entropy S mag of TmB 2 is determined. The ordered state of the Tm ions involves three CEF levels. Electronic-structure calculations, performed within the local spin density approximation, indicate a Ruderman-Kittel-Kasuya-Yoshida-type mechanism for the magnetic order. With respect to the total energy, ferromagnetic order is found to be more stable than the A-type antiferromagnetically ordered state, in agreement with the experiment.

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Section: Synthesis Methods and Crystal Structurementioning

confidence: 99%

Ferromagnetism and electronic structure ofTmB2

et al. 2009

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“…While Kuz’ma et al reported a solid solution phase for the (Ta 1– x Mo x ) 3 B 2 , we consider the ordered structure for the stoichiometric TaMo 2 B 2 compound to investigate its superconductivity. The B 2 dumbbell in TaMo 2 B 2 has a B–B bond length of ∼1.89 Å.…”

Section: Resultsmentioning

confidence: 99%

High-Throughput Screening for Boride Superconductors

Chen,

Wu,

Zhang

et al. 2024

Inorg. Chem.

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A high-throughput screening using density functional calculations is performed to search for stable boride superconductors from the existing materials database. The workflow employs the fast frozen-phonon method as the descriptor to evaluate the superconducting properties quickly. Twenty-three stable candidates were identified during the screening. The superconductivity was obtained earlier experimentally or computationally for almost all found binary compounds. Previous studies on ternary borides are very limited. Our extensive search among ternary systems confirmed superconductivity in known systems and found several new compounds. Among these discovered superconducting ternary borides, TaMo2B2 shows the highest superconducting temperature of ∼12 K. Most predicted compounds were synthesized previously; therefore, our predictions can be examined experimentally. Our work also demonstrates that the boride systems can have diverse structural motifs that lead to superconductivity.

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“…B-pieces-although wrapped in the corresponding Fig. 3 Phase relations in isothermal sections as shown in the literature for the ternary diagrams Ti-Ta-B (1250°C), [8] Zr-Ta-B (1500°C), [9] and Hf-Ta-B (1400°C). [10] The small circles represent the composition of samples investigated in this work mass of Ta-foil-tend to shatter under the arc and were replenished in several meltings so that overall weight losses were kept below 1%, however, the Ta:T ratio after synthesis was always within 0.1% of the nominal values (as monitored by EPMA-see below).…”

Section: Methodsmentioning

confidence: 99%

“…3) and, for the sections TaB-{Ti,Zr,Hf}B, have revealed extended solution phases of Ti,Zr,Hf in TaB and Ta in TiB. [8][9][10] It should be noted here that HfB (FeB-type) was not considered for the equilibria at 1400°C, [10] although earlier studies have documented its existence and peritectic decomposition at 2218°C. [11][12][13] ZrB with NaCl-type is impurity (C,N,O) stabilized, but the degree of thermodynamic stability of the ZrB-phase with FeB-type has been evaluated.…”

Section: Introductionmentioning

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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Phase equilibria in tantalum ? Titanium ? Boron and tantalum ? Molybdenum ? Boron systems

Cited by 9 publications

References 6 publications

Ferromagnetism and electronic structure ofTmB2

Ferromagnetism and electronic structure ofTmB2

High-Throughput Screening for Boride Superconductors

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

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