Superhardness Induced by Grain Boundary Vertical Sliding in (001)-textured ZrB<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si3.svg"><mml:msub><mml:mrow/><mml:mn>2</mml:mn></mml:msub></mml:math> and TiB<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si3.svg"><mml:msub><mml:mrow/><mml:mn>2</mml:mn></mml:msub></mml:math> Nano Films

Guo, Shukuan; Sun, Hong

doi:10.1016/j.actamat.2021.117212

Cited by 18 publications

(8 citation statements)

References 54 publications

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“…Transition metal diborides (TMDBs) have attracted a lot of attention over the past few decades due to their diverse properties, [1][2][3] including high hardness and shear strength, [4][5][6][7] excellent corrosion resistance, 8,9 superior catalytic performance, 10,11 notrivial band topology, 12,13 high electrical conductivity and even superconductivity. [14][15][16][17][18] Among existing TMDBs, molybdenum diboride is unique in that it exists in both hexagonal AlB 2 -type and rhombohedral structures.…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon doping on the structure and superconductivity in AlB₂‐type (Mo0.96Ti0.04)0.8${(\text{Mo}_{0.96}\text{Ti}_{0.04})}_{0.8}$B₂

et al. 2023

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We report the effect of carbon doping in Ti-stabilized nonstoichiometric molybdenum diboride (Mo 0.96 Ti 0.04 ) 0.8 B 2 , which exhibits bulk superconductivity below 𝑇 c = 7.0 K. It is found that (Mo 0.96 Ti 0.04 ) 0.8 (B 1−𝑥 C 𝑥 ) 2 maintains the AlB 2type phase with a uniform elemental distribution for 𝑥 = 0.12 and 0.16. The substitution of carbon for boron leads to a slight increase in 𝑎-axis, a remarkable reduction in 𝑐-axis, the formation of planar defects along the (100) crystallographic planes, and a shift of the B 1𝑠 peaks toward higher binding energies. Contrary to (Mo 0.96 Ti 0.04 ) 0.8 B 2 , however, no superconductivity is observed down to 1.8 K for the C-doped samples, which is ascribed to the electron filling of boron 𝜋 bands resulting from the carbon doping.

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Section: Introductionmentioning

confidence: 99%

Effect of carbon doping on the structure and superconductivity in AlB₂‐type (Mo0.96Ti0.04)0.8${(\text{Mo}_{0.96}\text{Ti}_{0.04})}_{0.8}$B₂

et al. 2023

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“…Transition metal diborides (TMDBs) have attracted a lot of attention over the past few decades due to their diverse properties [1][2][3], including high hardness and shear strength [4][5][6][7], excellent corrosion resistance [8,9], superior catalytic performance [10,11], notrivial band topology [12,13], high electrical conductivity and even superconductivity [14][15][16][17][18]. Among existing TMDBs, molybdenum diboride is unique in that it exists in both hexagonal AlB 2 -type and rhombohedral structures [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon doping on the structure and superconductivity in AlB$_{2}$-type (Mo$_{0.96}$Ti$_{0.04}$)$_{0.8}$B$_{2}$

Yang¹,

Xiao²,

Zhu³

et al. 2023

Preprint

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We report the effect of carbon doping in Ti-stabilized nonstoichiometric molybdenum diboride (Mo 0.96 Ti 0.04 ) 0.8 B 2 , which exhibits bulk superconductivity below T c = 7.0 K. It is found that (Mo 0.96 Ti 0.04 ) 0.8 (B 1−x C x ) 2 maintains the AlB 2 -type phase with a uniform elemental distribution for x = 0.12 and 0.16. The substitution of carbon for boron leads to a slight increase in a-axis, a remarkable reduction in c-axis, the formation of planar defects along the (100) crystallographic planes, and a shift of the B 1s peaks towards higher binding energies. Contrary to (Mo 0.96 Ti 0.04 ) 0.8 B 2 , however, no superconductivity is observed down to 1.8 K for the C-doped samples, which is ascribed to the electron filling of boron π bands resulting from the carbon doping.

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“…Additionally, polycrystalline microstructures of ZnO have been mechanically explored in thin film studies , which demonstrate a classic brittle ceramic behavior similar to bulk ZnO [17][18][19]. Broader investigations of nanocrystalline ceramics highlight the role of grain boundary (GB) sliding in plasticity [28][29][30][31][32]. This deformation mechanism gives rise to the inverse Hall-Petch effect where a material softens with decreasing grain size [28,29].…”

Section: Introductionmentioning

confidence: 99%

“…This deformation mechanism gives rise to the inverse Hall-Petch effect where a material softens with decreasing grain size [28,29]. The role of GB orientation and point defects in GB-mediated plasticity has also been widely explored in nanoceramics [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Microstructure-driven mechanical and electromechanical phenomena in additively manufactured nanocrystalline zinc oxide

Gallivan,

Aitken,

Chamoun-Farah

et al. 2023

Nanotechnology

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Advances in nanoscale additive manufacturing (AM) offer great opportunities to expand nanotechnologies; however, the size effects in these printed remain largely unexplored. Using both in-situ nanomechanical and electrical experiments and MD simulations, this study investigates additively manufactured nano-architected nanocrystalline ZnO (nc-ZnO) with ~7 nm grains and dimensions spanning 0.25-4 µm. These nano-scale ceramics are fabricated through printing and subsequent burning of metal ion-containing hydrogels to produce oxide structures. Electromechanical behavior is shown to result from random ordering in the microstructure and can be modeled through a statistical treatment. A size effect in the failure behavior of AM nc-ZnO is also observed and characterized by the changes in deformation behavior and suppression of brittle failure. MD simulations provide insights to the role of grain boundaries and grain boundary plasticity on both electromechanical behavior and failure mechanisms in nc-ZnO. The frameworks developed in this paper extend to other AM nanocrystalline materials and provide quantification of microstructurally-drive limitations to precision in materials property design.

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Superhardness Induced by Grain Boundary Vertical Sliding in (001)-textured ZrB2 and TiB2 Nano Films

Cited by 18 publications

References 54 publications

Effect of carbon doping on the structure and superconductivity in AlB₂‐type (Mo0.96Ti0.04)0.8${(\text{Mo}_{0.96}\text{Ti}_{0.04})}_{0.8}$B₂

Effect of carbon doping on the structure and superconductivity in AlB₂‐type (Mo0.96Ti0.04)0.8${(\text{Mo}_{0.96}\text{Ti}_{0.04})}_{0.8}$B₂

Effect of carbon doping on the structure and superconductivity in AlB$_{2}$-type (Mo$_{0.96}$Ti$_{0.04}$)$_{0.8}$B$_{2}$

Microstructure-driven mechanical and electromechanical phenomena in additively manufactured nanocrystalline zinc oxide

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Superhardness Induced by Grain Boundary Vertical Sliding in (001)-textured ZrB2 and TiB2 Nano Films

Cited by 18 publications

References 54 publications

Effect of carbon doping on the structure and superconductivity in AlB2‐type (Mo0.96Ti0.04)0.8${(\text{Mo}_{0.96}\text{Ti}_{0.04})}_{0.8}$B2

Effect of carbon doping on the structure and superconductivity in AlB2‐type (Mo0.96Ti0.04)0.8${(\text{Mo}_{0.96}\text{Ti}_{0.04})}_{0.8}$B2

Effect of carbon doping on the structure and superconductivity in AlB$_{2}$-type (Mo$_{0.96}$Ti$_{0.04}$)$_{0.8}$B$_{2}$

Microstructure-driven mechanical and electromechanical phenomena in additively manufactured nanocrystalline zinc oxide

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Product

Resources

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Effect of carbon doping on the structure and superconductivity in AlB₂‐type (Mo0.96Ti0.04)0.8${(\text{Mo}_{0.96}\text{Ti}_{0.04})}_{0.8}$B₂

Effect of carbon doping on the structure and superconductivity in AlB₂‐type (Mo0.96Ti0.04)0.8${(\text{Mo}_{0.96}\text{Ti}_{0.04})}_{0.8}$B₂