Investigation of ternary metal dodecaborides (M1M2M3)B12 (M1, M2 and M3 = Zr, Y, Hf and Gd)

Georgiy Akopov; Inwhan Roh; Zachary C. Sobell; Michael T. Yeung; Richard B. Kaner

doi:10.1039/c8dt00563j

Investigation of ternary metal dodecaborides (M₁M₂M₃)B₁₂ (M₁, M₂ and M₃ = Zr, Y, Hf and Gd)

Georgiy Akopov
, Inwhan Roh
, Zachary C. Sobell
, Michael T. Yeung
, Richard B. Kaner

Chemistry

University at Albany

University of California at Los Angeles

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

Samples of metal borides with a nominal composition of ((M₁)_(1-x-z)(M₂)_(x)(M₃)_(z)):20B (M₁, M₂ and M₃ = Zr, Y, Hf and Gd) were prepared by arc-melting and studied for phase composition (using powder X-ray diffraction (PXRD) and energy dispersive X-ray spectroscopy (EDS)) and mechanical properties (Vickers hardness). Ternary metal dodecaboride phases were successfully synthesized for the majority of compositions, including stabilization of two high-pressure (6.5 GPa) phases (cubic-UB₁₂ structure), HfB₁₂ and GdB₁₂, in (Zr_1-x-zHf_xGd_z):20B and (Y_1-x-zHf_xGd_z):20B nominal alloy compositions. Unit cell refinement for the samples showed solid solution formation in most cases. Vickers hardness measurements indicated that most samples possess enhanced hardness in comparison to their parent phases, with the alloy (Zr_0.50Y_0.25Gd_0.25):20B having a hardness of 46.9 ± 2.4 GPa compared to 41.3 ± 1.1 and 41.6 ± 1.3 GPa for alloy compositions of 1.0 Zr:20B and 1.0 Y:20B, respectively, at 0.49 N of applied load. Using the data from this manuscript as well as previous work, pseudo-ternary phase diagrams (at a constant boron content) have been constructed.

Original language	English
Pages (from-to)	6683-6691
Number of pages	9
Journal	Dalton Transactions
Volume	47
Issue number	19
DOIs	https://doi.org/10.1039/c8dt00563j
State	Published - 2018

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title = "Investigation of ternary metal dodecaborides (M1M2M3)B12 (M1, M2 and M3 = Zr, Y, Hf and Gd)",

abstract = "Samples of metal borides with a nominal composition of ((M1)(1-x-z)(M2)(x)(M3)(z)):20B (M1, M2 and M3 = Zr, Y, Hf and Gd) were prepared by arc-melting and studied for phase composition (using powder X-ray diffraction (PXRD) and energy dispersive X-ray spectroscopy (EDS)) and mechanical properties (Vickers hardness). Ternary metal dodecaboride phases were successfully synthesized for the majority of compositions, including stabilization of two high-pressure (6.5 GPa) phases (cubic-UB12 structure), HfB12 and GdB12, in (Zr1-x-zHfxGdz):20B and (Y1-x-zHfxGdz):20B nominal alloy compositions. Unit cell refinement for the samples showed solid solution formation in most cases. Vickers hardness measurements indicated that most samples possess enhanced hardness in comparison to their parent phases, with the alloy (Zr0.50Y0.25Gd0.25):20B having a hardness of 46.9 ± 2.4 GPa compared to 41.3 ± 1.1 and 41.6 ± 1.3 GPa for alloy compositions of 1.0 Zr:20B and 1.0 Y:20B, respectively, at 0.49 N of applied load. Using the data from this manuscript as well as previous work, pseudo-ternary phase diagrams (at a constant boron content) have been constructed.",

author = "Georgiy Akopov and Inwhan Roh and Sobell, \{Zachary C.\} and Yeung, \{Michael T.\} and Kaner, \{Richard B.\}",

note = "Publisher Copyright: {\textcopyright} 2018 The Royal Society of Chemistry.",

year = "2018",

doi = "10.1039/c8dt00563j",

language = "English",

volume = "47",

pages = "6683--6691",

journal = "Dalton Transactions",

issn = "1477-9226",

publisher = "Royal Society of Chemistry",

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T1 - Investigation of ternary metal dodecaborides (M1M2M3)B12 (M1, M2 and M3 = Zr, Y, Hf and Gd)

AU - Akopov, Georgiy

AU - Roh, Inwhan

AU - Sobell, Zachary C.

AU - Yeung, Michael T.

AU - Kaner, Richard B.

PY - 2018

Y1 - 2018

N2 - Samples of metal borides with a nominal composition of ((M1)(1-x-z)(M2)(x)(M3)(z)):20B (M1, M2 and M3 = Zr, Y, Hf and Gd) were prepared by arc-melting and studied for phase composition (using powder X-ray diffraction (PXRD) and energy dispersive X-ray spectroscopy (EDS)) and mechanical properties (Vickers hardness). Ternary metal dodecaboride phases were successfully synthesized for the majority of compositions, including stabilization of two high-pressure (6.5 GPa) phases (cubic-UB12 structure), HfB12 and GdB12, in (Zr1-x-zHfxGdz):20B and (Y1-x-zHfxGdz):20B nominal alloy compositions. Unit cell refinement for the samples showed solid solution formation in most cases. Vickers hardness measurements indicated that most samples possess enhanced hardness in comparison to their parent phases, with the alloy (Zr0.50Y0.25Gd0.25):20B having a hardness of 46.9 ± 2.4 GPa compared to 41.3 ± 1.1 and 41.6 ± 1.3 GPa for alloy compositions of 1.0 Zr:20B and 1.0 Y:20B, respectively, at 0.49 N of applied load. Using the data from this manuscript as well as previous work, pseudo-ternary phase diagrams (at a constant boron content) have been constructed.

AB - Samples of metal borides with a nominal composition of ((M1)(1-x-z)(M2)(x)(M3)(z)):20B (M1, M2 and M3 = Zr, Y, Hf and Gd) were prepared by arc-melting and studied for phase composition (using powder X-ray diffraction (PXRD) and energy dispersive X-ray spectroscopy (EDS)) and mechanical properties (Vickers hardness). Ternary metal dodecaboride phases were successfully synthesized for the majority of compositions, including stabilization of two high-pressure (6.5 GPa) phases (cubic-UB12 structure), HfB12 and GdB12, in (Zr1-x-zHfxGdz):20B and (Y1-x-zHfxGdz):20B nominal alloy compositions. Unit cell refinement for the samples showed solid solution formation in most cases. Vickers hardness measurements indicated that most samples possess enhanced hardness in comparison to their parent phases, with the alloy (Zr0.50Y0.25Gd0.25):20B having a hardness of 46.9 ± 2.4 GPa compared to 41.3 ± 1.1 and 41.6 ± 1.3 GPa for alloy compositions of 1.0 Zr:20B and 1.0 Y:20B, respectively, at 0.49 N of applied load. Using the data from this manuscript as well as previous work, pseudo-ternary phase diagrams (at a constant boron content) have been constructed.

UR - https://www.scopus.com/pages/publications/85047398524

U2 - 10.1039/c8dt00563j

DO - 10.1039/c8dt00563j

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JO - Dalton Transactions

JF - Dalton Transactions

IS - 19

ER -

Investigation of ternary metal dodecaborides (M₁M₂M₃)B₁₂ (M₁, M₂ and M₃ = Zr, Y, Hf and Gd)

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