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Liu, G. B.; Fortune, H. T.

doi:10.1103/physrevc.42.167

Cited by 78 publications

(78 citation statements)

References 13 publications

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“…In the shell-model the corresponding bands in the SU(3) limit have (λ µ) = (2 1 The level scheme for states below 4 MeV shown in Fig. 3 is the same as that from Liu and Fortune's analysis of the 9 Be(t, p) 11 Be reaction [62] with the exception of the 3.956-MeV level. However, the L = 2 angular distribution observed for this level is consistent with a 5 2 − assignment and the discussion in the previous paragraph indicates that one of the two levels in this region is the first p-shell 5 2 − level.…”

Section: The Be Isotopesmentioning

confidence: 77%

“…3. However, the width of the 3.41 MeV level is over 100 keV [62] and this is inconsistent with the small d 3/2 spectroscopic predicted for the lowest All three states of the K π = 1 2 − band have large parentages for neutron removal from 12 N. The proton spectrum which results from the decay of the resulting 11 N states has been studied [65] and can be qualitatively reproduced using the calculated decay widths for the p-shell states of 11 N.…”

Section: The Be Isotopesmentioning

confidence: 99%

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Structure of unstable light nuclei

Millener

2001

Nuclear Physics A

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The structure of light nuclei out to the drip lines and beyond up to Z ∼ 8 is interpreted in terms of the shell model. Special emphasis is given to the underlying supermultiplet symmetry of the p-shell nuclei which form cores for neutrons and protons added in sd-shell orbits. Detailed results are given on the wave functions, widths, and Coulomb energy shifts for a wide range of non-normal parity states in the p-shell.

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Section: The Be Isotopesmentioning

confidence: 77%

Section: The Be Isotopesmentioning

confidence: 99%

Structure of unstable light nuclei

Millener

2001

Nuclear Physics A

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“…͓DOI: 10.1063/1.2158130͔ Bulk metallic glasses ͑BMGs͒ as a prominent class of functional and structural materials with unique properties have attracted intensive interests due to their considerable significance in science and technology. [1][2][3][4][5][6][7][8][9][10][11] In order to make the best use of these noncrystalline materials, the key problem is to develop BMGs with improved properties and excellent glass forming ability ͑GFA͒. It is commonly regarded that the formation of metallic glasses is controlled by two factors, i.e., the cooling rate and the composition of the alloys.…”

mentioning

confidence: 99%

“…3. The liquid temperature ͑T l ͒ for the alloy is about 1483 K. Therefore, the reduced glass transition temperature T rg ͑=T g / T l ͒, the supercooled liquid region ⌬T x ͑=T x1 − T g ͒, and parameter ␥͓=T x1 / ͑T g + T l ͔͒, which are usually employed to reflect the GFA of the alloys, [8][9][10][11] 13,14 and Ni 62 Nb 38 in the present work, has evoked tremendous interests recently. A phase selection diagram is proposed to explain the phenomena and it is suggested that the better glass former could be on the side with a steeper liquidus slope.…”

mentioning

confidence: 99%

Binary Ni–Nb bulk metallic glasses

Xia¹,

Li²,

Fang³

et al. 2006

Journal of Applied Physics

180

105

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We studied the glass forming ability of Ni-Nb binary alloys and found that some of the alloys can be prepared into bulk metallic glasses by a conventional Cu-mold casting. The best glass former within the compositional range studied is off-eutectic Ni 62 Nb 38 alloy, which is markedly different from those predicted by the multicomponent and deep eutectic rules. The glass formation mechanism for binary Ni-Nb alloys was studied from the thermodynamic point of view and a parameter ␥ * was proposed to approach the ability of glass formation against crystallization. © 2006 American Institute of Physics. ͓DOI: 10.1063/1.2158130͔ Bulk metallic glasses ͑BMGs͒ as a prominent class of functional and structural materials with unique properties have attracted intensive interests due to their considerable significance in science and technology. [1][2][3][4][5][6][7][8][9][10][11] In order to make the best use of these noncrystalline materials, the key problem is to develop BMGs with improved properties and excellent glass forming ability ͑GFA͒. It is commonly regarded that the formation of metallic glasses is controlled by two factors, i.e., the cooling rate and the composition of the alloys. The critical cooling rate, which is the most effective gauge for GFA of the alloys, is hard to be measured experimentally. Hence, a great deal of efforts have devoted to the investigation on the composition of glass forming alloys. Inoue et al. 11 and Johnson 1 framed the empirical rules to predict the element selection and compositional range of glass forming alloys. These rules have played an important role as a guideline for synthesis of BMGs for the last decade.Binary alloys are usually considered to have a lower GFA due to their lack of complicated structure with atomic configuration according to the "confuse principal." 2,3 However, recent experimental results have shown that binary Zr-Cu alloys can also be vitrified into BMGs. [12][13][14] In contrast with the deep eutectic rule, the better glass formers in Zr-Cu binary alloy system such as Zr 35.5 Cu 64.5 and Zr 50 Cu 50 are off eutectic. Therefore, the empirical rules for glass formation, that is, multicomponent alloys with composition near deep eutectic, could be no longer the major concern for designing BMGs.In this work, we reported that some of the Ni-Nb binary alloys can be prepared into fully glassy rods up to 2 mm in diameter by a conventional Cu-mold casting method. The best glass former within the compositional range studied is off-eutectic Ni 62 Nb 38 alloy, which is different from those predicted by the multicomponent and deep eutectic rules. The glass formation mechanism of the binary alloys was studied from the thermodynamic point of view based on Miedema's calculation model.Ingots of Ni-Nb binary alloys with different compositions were prepared separately by arc-melting of 99.9% ͑at. %͒ pure Ni and Nb in titanium-gettered argon atmosphere. The rods of 2 mm in diameter were prepared by suction casting under argon atmosphere. The structure of the samples was charact...

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“…7,8 In thermodynamics, the existence of an alloy liquid toward lower temperatures is a manifestation of its increasing thermodynamic stability when compared with its competing crystalline phases as the temperature is lowered. Although this is a necessary but not a sufficient condition, decreasing temperature increases the liquid's viscosity ͑with corresponding decreases in its diffusivity͒.…”

mentioning

confidence: 99%

Bulkier glass formability enhanced by minor alloying additions

Cao

Ding

et al. 2005

Applied Physics Letters

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In this study, we present a computational thermodynamic strategy to obtain a minor but optimum amount of additional element into a base alloy to improve its glass-forming ability, through thermodynamically calculating the maximum liquidus depressions caused by various alloying addition ͑or replacement͒ schemes. We demonstrate the successful use of Zr 56.2 Cu 31.3 Ni 4.0 Al 8.5 as the base alloy with the addition of 4.9% Ti, by observing a significant increase in the glass-forming ability of more than 100% in terms of the diameter of the glass formed from the base alloy to the one with the addition of 4.9% Ti. The approach presented here can be considered as a universal method to synthesize novel and bulkier metallic glasses not only of scientific interest but also potential technological applications. , respectively. This success has provided a fresh impetus to the idea that micro-or minor alloying represents an effective way to develop novel bulkier metallic glasses. However, due to the complex nature of the multicomponent interactions involved, the underlying mechanism upon the enhancement of glass-forming ability ͑GFA͒ by minor alloying still remains a puzzling mystery. It thus becomes difficult to identify the optimum amount of a potential element, a priori, for improving the GFA of a known glass-forming alloy. Neither the recent compelling structural model proposed by Miracle, 3 nor current atomistic simulation, such as reverse Monte Carlo and molecular dynamics simulation, is able to make such predictions. 4,5 Here, using Al-Cu-Ni-Zr-Ti as a model system, we present a robust computational thermodynamic approach to obtain multicomponent phase diagrams; 6 on the basis of which, we are able to formulate a practically useful strategy for pinpointing bulkier glass-forming compositions of Al-Cu-Ni-Zr with optimum Ti-alloying additions.A strong indication drawn from the aforementioned experimental works 1,2 is that the Y-enhanced GFA of the Cuand Fe-based alloys is accompanied by a substantial depression in the liquidus temperature caused by the addition of Y, and the bulkiest Y-alloyed BMGs are those possessing the deepest liquidus depressions compared with the base alloys. These findings are in accord with the known GFA criteria, such as T rg ͑=T g / T l , where T g is the glass transition temperature and T l is the liquidus temperature͒ andwhere T x is the temperature of the onset of crystallization͒, both of which indicate that decreasing the liquidus temperature facilitates easier glass formation. 7,8 In thermodynamics, the existence of an alloy liquid toward lower temperatures is a manifestation of its increasing thermodynamic stability when compared with its competing crystalline phases as the temperature is lowered. Although this is a necessary but not a sufficient condition, decreasing temperature increases the liquid's viscosity ͑with corresponding decreases in its diffusivity͒.9 This in turn, kinetically, also favors glass formation. Thus, in this letter, we use the liquidus temperature ͑or depression͒...

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Be9(t,p)11

Cited by 78 publications

References 13 publications

Structure of unstable light nuclei

Structure of unstable light nuclei

Binary Ni–Nb bulk metallic glasses

Bulkier glass formability enhanced by minor alloying additions

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