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In Situ Synthesis of RMB 6 -TMB 2 Composite Nanopowders via One-Step Solid-State Reduction.

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Title: In Situ Synthesis of RMB 6 -TMB 2 Composite Nanopowders via One-Step Solid-State Reduction.
Authors: Guo, Xiaogang1 (AUTHOR), Wang, Linyan2 (AUTHOR), Zhou, Hang1,3 (AUTHOR), Xu, Jun1,4 (AUTHOR), Liu, An1,3 (AUTHOR) gyf@ysu.edu.cn, Ma, Mengdong2,3 (AUTHOR), Sun, Rongxin3,4 (AUTHOR) ydl@ysu.edu.cn, Qin, Weidong1,4 (AUTHOR), Gao, Yufei1 (AUTHOR), Liu, Bing1 (AUTHOR), Li, Baozhong1 (AUTHOR), Sun, Lei1 (AUTHOR), Yu, Dongli1 (AUTHOR)
Source: Nanomaterials (2079-4991). Sep2025, Vol. 15 Issue 17, p1341. 12p.
Subjects: Eutectic structure, Solid-phase synthesis, Nanocomposite materials, Sodium borohydride, Phase equilibrium, Field emission, Biosynthesis
Abstract: RMB6-TMB2 (RM = rare earth elements, TM = transition metal elements) composites retain superior field emission properties of RMB6 while addressing its inherent mechanical limitations by constructing a eutectic structure with TMB2. Herein, an in situ route for synthesizing RMB6-TMB2 composite nanopowders with homogeneous phase distribution using reduction reactions was proposed. The LaB6-ZrB2 composite nanopowders were synthesized in situ for the first time using sodium borohydride (NaBH4) as both a reducing agent and boron source, with lanthanum oxide (La2O3) and zirconium dioxide (ZrO2) serving as metal sources. The effects of the synthesis temperature on phase compositions and microstructure of the composites were systematically investigated. The LaB6-ZrB2 system with a eutectic weight ratio exhibited an accelerated reaction rate, achieving a complete reaction at 1000 °C, 300 °C lower than that of single-phase ZrB2 synthesis. The composite phases were uniformly distributed even at nanoscale. The composite powder displayed an average particle size of ~170 nm when synthesized at 1300 °C. With the benefit of the in situ synthesis method, LaB6-TiB2, CeB6-ZrB2, and CeB6-TiB2 composite powders were successfully synthesized. This process effectively addresses phase separation and contamination issues typically associated with traditional mixing methods, providing a scalable precursor for high-performance RMB6-TMB2 composites. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
  Group: Ti
  Data: In Situ Synthesis of RMB 6 -TMB 2 Composite Nanopowders via One-Step Solid-State Reduction.
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  Data: <searchLink fieldCode="AR" term="%22Guo%2C+Xiaogang%22">Guo, Xiaogang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Linyan%22">Wang, Linyan</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhou%2C+Hang%22">Zhou, Hang</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xu%2C+Jun%22">Xu, Jun</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+An%22">Liu, An</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<i> gyf@ysu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Ma%2C+Mengdong%22">Ma, Mengdong</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sun%2C+Rongxin%22">Sun, Rongxin</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<i> ydl@ysu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Qin%2C+Weidong%22">Qin, Weidong</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gao%2C+Yufei%22">Gao, Yufei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Bing%22">Liu, Bing</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Baozhong%22">Li, Baozhong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sun%2C+Lei%22">Sun, Lei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yu%2C+Dongli%22">Yu, Dongli</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Sep2025, Vol. 15 Issue 17, p1341. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Eutectic+structure%22">Eutectic structure</searchLink><br /><searchLink fieldCode="DE" term="%22Solid-phase+synthesis%22">Solid-phase synthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Nanocomposite+materials%22">Nanocomposite materials</searchLink><br /><searchLink fieldCode="DE" term="%22Sodium+borohydride%22">Sodium borohydride</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+equilibrium%22">Phase equilibrium</searchLink><br /><searchLink fieldCode="DE" term="%22Field+emission%22">Field emission</searchLink><br /><searchLink fieldCode="DE" term="%22Biosynthesis%22">Biosynthesis</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: RMB6-TMB2 (RM = rare earth elements, TM = transition metal elements) composites retain superior field emission properties of RMB6 while addressing its inherent mechanical limitations by constructing a eutectic structure with TMB2. Herein, an in situ route for synthesizing RMB6-TMB2 composite nanopowders with homogeneous phase distribution using reduction reactions was proposed. The LaB6-ZrB2 composite nanopowders were synthesized in situ for the first time using sodium borohydride (NaBH4) as both a reducing agent and boron source, with lanthanum oxide (La2O3) and zirconium dioxide (ZrO2) serving as metal sources. The effects of the synthesis temperature on phase compositions and microstructure of the composites were systematically investigated. The LaB6-ZrB2 system with a eutectic weight ratio exhibited an accelerated reaction rate, achieving a complete reaction at 1000 °C, 300 °C lower than that of single-phase ZrB2 synthesis. The composite phases were uniformly distributed even at nanoscale. The composite powder displayed an average particle size of ~170 nm when synthesized at 1300 °C. With the benefit of the in situ synthesis method, LaB6-TiB2, CeB6-ZrB2, and CeB6-TiB2 composite powders were successfully synthesized. This process effectively addresses phase separation and contamination issues typically associated with traditional mixing methods, providing a scalable precursor for high-performance RMB6-TMB2 composites. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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    Identifiers:
      – Type: doi
        Value: 10.3390/nano15171341
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 12
        StartPage: 1341
    Subjects:
      – SubjectFull: Eutectic structure
        Type: general
      – SubjectFull: Solid-phase synthesis
        Type: general
      – SubjectFull: Nanocomposite materials
        Type: general
      – SubjectFull: Sodium borohydride
        Type: general
      – SubjectFull: Phase equilibrium
        Type: general
      – SubjectFull: Field emission
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      – SubjectFull: Biosynthesis
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      – TitleFull: In Situ Synthesis of RMB 6 -TMB 2 Composite Nanopowders via One-Step Solid-State Reduction.
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            – D: 01
              M: 09
              Text: Sep2025
              Type: published
              Y: 2025
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