Elastic modulus of amorphous SiO2 nanowires

Ni, Hai; Li, Xiaodong; Gao, Hongsheng

doi:10.1063/1.2165275

Cited by 147 publications

(120 citation statements)

References 44 publications

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“…To determine the elastic modulus of the amorphous SiO x nanowires, nano-scale three-point bending tests can be performed directly on individual amorphous SiO x nanowires using an atomic force microscope (AFM). Ni and Gao (2006) found that the elastic modulus of the amorphous SiO 2 nanowires was 76.6 ± 7.2 GPa. The amorphous SiO 2 nanowires also exhibited brittle fracture failure in bending.…”

Section: Elastic Modulus Of Sio X Nanowiresmentioning

confidence: 99%

“…Some of these properties are summarized in the (Wei et al, 2006, Jin et al, 2008, Ni et al, 2006and Bilalbegović, 2006.…”

Section: Properties Of Sio X Nanowiresmentioning

confidence: 99%

“…The amorphous SiO 2 nanowires also exhibited brittle fracture failure in bending. Based on the assumption that the nanowire follows linear elastic theory of an isotropic material, the elastic modulus of the SiO 2 nanowire, E n , can be calculated from the following equation (Ni and Gao, 2006).…”

Section: Elastic Modulus Of Sio X Nanowiresmentioning

confidence: 99%

See 2 more Smart Citations

Advances of SiOx and Si/SiOx Core-Shell Nanowires

Cheong¹,

Chiew²

2010

Nanowires Science and Technology

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Section: Elastic Modulus Of Sio X Nanowiresmentioning

confidence: 99%

“…Some of these properties are summarized in the (Wei et al, 2006, Jin et al, 2008, Ni et al, 2006and Bilalbegović, 2006.…”

Section: Properties Of Sio X Nanowiresmentioning

confidence: 99%

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Advances of SiOx and Si/SiOx Core-Shell Nanowires

Cheong¹,

Chiew²

2010

Nanowires Science and Technology

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“…For various a-SiO x compositions, these two moduli were successfully evaluated by first-principles calculations using a statistical approach in our previous work 63 and the endpoint cases (x = 0 and 2) have been wellcharacterized through experimental measurements. [64][65][66][67][68][69] Additional mechanical properties, such as the Poisson ratio (ν) and shear modulus (G), can be calculated once Y and B are known because only two of these four quantities are independent in isotropic materials. 63 We apply our previously reported moduli calculation method to VFF total energy data to evaluate Y and B based on both KT(LH) and KT(TT) potentials for a-Si and a-SiO 2 in order to quantify the degree of rigidity in respective a-Si and a-SiO 2 matrices.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Ab initioparameterized valence force field for the structure and energetics of amorphous SiOx(0 ⩽x
Lee
¹
,
Bondi
²
,
Hwang
³

2011
Phys. Rev. B

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We present a modified valence force field model for the structure and energetics of amorphous silicon suboxides (a-SiO x , 0 ≤ x ≤ 2). The parameters are optimized to fit the results from cluster and periodic density functional theory (DFT) calculations of various model structures. The potential model well reproduces the DFT energetics of various a-SiO x systems for all O/Si composition ratios. We also examine how the choice of force fields affects the atomic-level description of phase separation in a-SiO x and a-Si/a-SiO 2 interfaces using a continuous random network model-based Monte Carlo approach. The results highlight the critical role of the relative rigidity between Si and SiO 2 matrices in determination of the structural properties of the Si/SiO 2 composite system, such as interface bond topology, degree of phase separation, and abruptness of the interface.

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“…In our systematic studies, an approximately 13% elastic strain limit for silica NWs with diameters around 50 nm was confirmed. The uniaxial tensile stress corresponding to such an elastic strain limit would be 9.5 GPa (assuming a Young's modulus of 73 GPa for silica NWs [22]). Recent results have revealed that the movement of atomic clusters (or atoms) and open volumes directly results in large elastic strain [19].…”

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confidence: 99%

Origin of high elastic strain in amorphous silica nanowires

et al. 2015

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An understanding of the origin of elastic strain is extremely important for both crystalline materials and amorphous materials. Owing to the lack of a long range order in their structure, it is arduous to dynamically study the elastic mechanism of amorphous materials experimentally at atomic scale compared with their crystalline counterparts. Here, the elastic deformation mechanism of amorphous silica nanowires (NWs) has been studied for the first time via in situ elastic tensile tests in a transmission electron microscope. Radial distribution functions (RDFs) calculated from the corresponding selected area electron diffraction patterns (SAEDPs) at different strains were used to reconstruct a structural model based on the reverse Monte-Carlo (RMC) method. The result interestingly indicates that the elastic strain of silica glass NWs can be mainly attributed to the elastic elongation of the bond length accompanied by a change in the bond angle distribution. This work is useful for understanding the high strength of amorphous materials.The two most crucial properties of a structural material are its elastic strain limit and plasticity. Plasticity is the property indicating the flexibility of a material, while the elastic strain limit represents the maximum stress that the material can withstand before yielding. The development of materials with high elastic strain limit and excellent plasticity is an urgent target for researchers [1−4]. Amorphous materials such as oxide glasses and metallic glasses are widely used in military applications. Unlike for their crystalline counterparts, there is still inadequate comprehension of the extraordinary behaviors of such glasses [5−10]. In nano-sized objects, smaller is stronger, owing to the combination of their decreased defect density and increased strength and elastic strain. Experimental elastic strain limits of more than 7.8% for ZnO nanowires (NWs) [11,12] the size of such glasses minimizes flaw size and maximizes their strength (i.e., elastic strain). Elimination of extrinsic flaws and decreased internal structural defects can lead to an outstanding large elastic strain limit of more than 3-6% for submicro-sized glasses [16−19], in which shear bands are suppressed owing to the reduction in size [16]. The ultimate strength of silica NWs is higher than 10 GPa and increases with decreasing NW diameter. The reduced possibility of having large cracks in small samples is the main reason for their high strength [20]. Molecular dynamic simulations also indicate such a size-dependent elasticity for amorphous silica NWs originating from coupling between core softening and surface stiffening of each NW the structure of which is different from its bulk counterpart [21]. In our systematic studies, an approximately 13% elastic strain limit for silica NWs with diameters around 50 nm was confirmed. The uniaxial tensile stress corresponding to such an elastic strain limit would be 9.5 GPa (assuming a Young's modulus of 73 GPa for silica NWs [22]). Recent results have revealed that the...

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Elastic modulus of amorphous SiO2 nanowires

Cited by 147 publications

References 44 publications

Advances of SiOx and Si/SiOx Core-Shell Nanowires

Advances of SiOx and Si/SiOx Core-Shell Nanowires

Ab initioparameterized valence force field for the structure and energetics of amorphous SiOx(0 ⩽x
Lee
¹
,
Bondi
²
,
Hwang
³

2011
Phys. Rev. B

Origin of high elastic strain in amorphous silica nanowires

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Elastic modulus of amorphous SiO2 nanowires

Cited by 147 publications

References 44 publications

Advances of SiOx and Si/SiOx Core-Shell Nanowires

Advances of SiOx and Si/SiOx Core-Shell Nanowires

Ab initioparameterized valence force field for the structure and energetics of amorphous SiOx(0 ⩽x Lee1, Bondi2, Hwang3 2011Phys. Rev. B

Origin of high elastic strain in amorphous silica nanowires

Contact Info

Product

Resources

About

Ab initioparameterized valence force field for the structure and energetics of amorphous SiOx(0 ⩽x
Lee
¹
,
Bondi
²
,
Hwang
³

2011
Phys. Rev. B