Critical Currents in Superconductors

Shmidt, Victoria

doi:10.1070/pu1970v013n03abeh004263

Cited by 16 publications

(57 citation statements)

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“…In the case of haloacetates, they were estimated by linear interpolation. A typical correlation between AH'f, 29s MAn(c) and the Edwards parameter of the correponding acids [8] are shown in Fig. 1.…”

Section: Ah'r 29s Man(c) = Ah~ 298 Man(c) -Ah~ ~+ (S) -N Ai-]~ 29sa(g)mentioning

confidence: 98%

“…Later it was demonstrated that this parametr is related to the log pI~ of the corresponding acid as H = pK, + 1,74; however, as indicated in the review [8], it is more universal than pK~, being determined for strong acids.…”

mentioning

confidence: 96%

“…It was shown in [6] that in the series of nitrate, trifluoroacetate, trichloroacetate, monochloroacetate, and acetate ions, in which the electron-donor power of the anion increases, the lattice enthalpies of the anhydrous uranyl salts and the dissociation enthalpies of the corresponding acids in the gaseous state under normal conditions linearly correlate with the Edwards parameter within experimental error. In turn, this parameter is linearly related to the logarithm of the acid dissociation constant in aqueous solution [8], if the corrected Edwards parameter is used for nitric acid [6].…”

mentioning

confidence: 99%

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Enthalpies of crystal lattices and standard enthalpies of formation of crystalline metal haloacetates

Baluev

1999

Czech J Phys

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A method for the calculation of the enthalpies of crystal lattices and standard enthalpies of formation of anhydrous metal nitrates and carboxylates is presented. The estimation of ~l-Ilat is based on interpolation of the linear plots of this value vs. the Edwards parameter, which, in turn, is a linear function of the logarithm of the acid dissociation constant. Linearity of the above dependence was previously found experimentally for the corresponding uranyl salts. Previously unknown lattice enthalpies and standard enthalpies of formation of a large set of anhydrous metal nitrates and carboxylates are calculated.Various aspects of the effect of the anionic characteristics, particularly electrondonor power, on the properties of salts both in crystalline state and solution were extensively studied. Anionic effects also contributes significantly to extraction processes. It was demonstrated with the example of haloacetate complexes that optimization of electron-donor characteristics of the anion in attraction to neutral extractants by solvation and hydration-solvation mechanisms allows an enhancement of the distribution coefficients, and in certain cases, of the cation partition coefficients [1][2][3][4].In Markus's classic work [5], devoted to determination of the enthalpies of crystal lattice (AHlat) of uranyl fluoride and standard formation enthalpy (AH0f, 298) of gaseous UO22 § and also in other works, it was demonstrated that thermodynamic calculations of extraction equilibria, prediction of the distribution coefficients, and, correspondingly, of element separation require information on the termodynamic characteristics of various salts.This study is devoted to the calculation of the lattice enthalpies and standard enthalpies of formation of metal nitrates, acetates, and haloacetates. It should be noted that the above thermodynamic functions are fundamental, and their importance is not restricted to problems of extraction [3,5].In [6], a thermochemical cycle was proposed for calculation of lattice enthalpies of uranyl haloacetates and dissociation enthalpies of the corresponding acids in the gaseous state. The lattice enthalpies ofuranyl salts were calculated from experimental calorimetric data [7] using the standard enthalpy of formation of gaseous uranyl ion calculated in [5]. It was shown in [6] that in the series of nitrate, trifluoroacetate, trichloroacetate, monochloroacetate, and acetate ions, in which the electron-donor power of the anion increases, the lattice enthalpies of the anhydrous uranyl salts and the dissociation enthalpies of the corresponding acids in the gaseous state under normal conditions linearly correlate with the Edwards parameter within experimental error. In turn, this parameter is linearly related to the logarithm of the acid dissociation constant in aqueous solution [8], if the corrected Edwards parameter is used for nitric acid [6].

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Section: Ah'r 29s Man(c) = Ah~ 298 Man(c) -Ah~ ~+ (S) -N Ai-]~ 29sa(g)mentioning

confidence: 98%

mentioning

confidence: 96%

mentioning

confidence: 99%

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Enthalpies of crystal lattices and standard enthalpies of formation of crystalline metal haloacetates

Baluev

1999

Czech J Phys

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“…It should be noted that in chemical handbooks the same values of the dissociation constants for benzenesulphonic and p-toluenesulphonic acids in aqueous solutions (2 x 10 -1 at 25~ are given. According to [4] in most cases the dissociation constants of acids correlate with the Edwards parameters reflecting variations of electron-donor power of anions.…”

Section: Introductionmentioning

confidence: 97%

“…Previously [1,2] for uranyl haloacetates as an example it has been shown that extremely small variations in the anion electron-donor power [3,4] give rise to significant variations in the characteristics of salts and their behaviour in extraction. In particular, the distribution coefficients of uranium and a series of rare-earth elements [5] in trichloroacetate media increase several tens or several hundred times in comparison with the corresponding nitrate media in extraction with ethers, ketones, and trim-butyl phosphate.…”

Section: Introductionmentioning

confidence: 99%

Uranyl p-toluenesulphonate and its crystal hydrates. Synthesis and dehydration-hydration processes

et al. 2003

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Lowest hydrates of uranyl p-toluenesulphonate (UPTS) and anhydrous salt were synthesised. The dehydration-hydration processes were studied by thermal gravimetric analysis. It has been established that the hydrate shell of UPTS has a layered structure. The IR spectra of UPTS and its hydrates were recorded. It was found that the IR spectra of UPTS crystal hydrates of the same composition, produced in dehydration-hydration, noticeably differ in the range of water vibrations and are the same in the range corresponding to vibrations of sulphonate groups.

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Large Enhancement of Critical Current in Superconducting Devices by Gate Voltage

et al. 2020

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Significant control over the properties of a high-carrier density superconductor via an applied electric field has been considered infeasible due to screening of the field over atomic length scales. Here, we demonstrate an enhancement of up to 30% in critical current in a back-gate tunable NbN micro- and nano superconducting bridges. Our suggested plausible mechanism of this enhancement in critical current based on surface nucleation and pinning of Abrikosov vortices is consistent with expectations and observations for type-II superconductor films with thicknesses comparable to their coherence length. Furthermore, we demonstrate an applied electric field-dependent infinite electroresistance and hysteretic resistance. Our work presents an electric field driven enhancement in the superconducting property in type-II superconductors which is a crucial step toward the understanding of field-effects on the fundamental properties of a superconductor and its exploitation for logic and memory applications in a superconductor-based low-dissipation digital computing paradigm.

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Critical Currents in Superconductors

Cited by 16 publications

References 0 publications

Enthalpies of crystal lattices and standard enthalpies of formation of crystalline metal haloacetates

Enthalpies of crystal lattices and standard enthalpies of formation of crystalline metal haloacetates

Uranyl p-toluenesulphonate and its crystal hydrates. Synthesis and dehydration-hydration processes

Large Enhancement of Critical Current in Superconducting Devices by Gate Voltage

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