High-pressure–high-temperature synthesis of magnesium diboride with different additions

Prikhna, T. A.; Gawalek, W.; Savchuk, Yaroslav; Sergienko, Nina; Moshchil, Viktor; Дуб, С. Н.; Sverdun, V. B.; Kovalev, L.K.; Penkin, V.T.; Zeisberger, Matthias; Wendt, Michael; Fuchs, G.; Habisreuther, T.; Litzkendorf, D.; Nagorny, Peter; Melnikov, V. S.

doi:10.1016/j.physc.2007.04.110

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…Since the discovery of the superconductive property of magnesium diboride (MgB 2 ) in 2001, its synthetic methods [1][2][3][4], single crystals growth [5], spectral properties [6], superconductive characteristics [7], applications [8] and synthesis reaction mechanism under vacuum [9] are widely researched lately. Up to now, the interactional properties between MgB 2 and solvents have never been investigated, however.…”

Section: Introductionmentioning

confidence: 99%

Study on Thermodynamics and Kinetics for the Reaction of Magnesium Diboride and Water by Microcalorimetry

Zhao¹,

Xiao²,

Xiao³

et al. 2011

AJAC

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An exothermic reaction between MgB2 and water was observed in our laboratory at high temperature, although no obvious reaction occurred at room temperature. The reaction process of MgB2 and water was therefore studied by using microcalorimetry. The results showed that the reaction enthalpies of MgB2 with water and the formation enthalpies of MgB2 at T = (323.15, 328.15, 333.15 and 338.15) K are (–313.15, –317.85, –322.09, –329.27) kJ?mol–1, and (–238.96, –237.73, –236.50, –234.30) kJ●mol–1, respectively. The standard enthalpy of formation and standard molar heat capacity of MgB2 obtained by extrapolation method are –245.11 kJ●mol–1 and 246 J●mol–1●K–1, respectively. The values of activation energy E, pre-exponential factor A and the reaction order for the reaction of MgB2 and water over the temperature range from 323.15 K to 338.15 K are 50.80 kJ●mol–1, 104.78 s–1 and about 1.346, respectively. The positive values of ΔG≠ and ΔH≠ and negative value of ΔS≠ indicate that the reaction can take place easily above 314.45 K

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Section: Introductionmentioning

confidence: 99%

Study on Thermodynamics and Kinetics for the Reaction of Magnesium Diboride and Water by Microcalorimetry

Zhao¹,

Xiao²,

Xiao³

et al. 2011

AJAC

View full text Add to dashboard Cite

show abstract

“…The substitution of C at B site by using various forms of C-containing dopants, such as SiC [5][6][7][8][9], C [10][11][12][13], B 4 C [14,15] and some organic compounds [16][17][18], has been very effective in improving Hc 2 . Metallic elements, such as Ca, Nb, Ti and Cu as a substitute for Mg, have also been used to improve T c and magnetic J c [19][20][21]. Introduction of fine non-superconducting particles as pinning centers is also believed to be an effective way to enhance the superconductivity [22].…”

Section: Introductionmentioning

confidence: 99%

Enhanced superconducting properties of Eu2O3-doped MgB2

Ojha

Malik

Bernhard

et al. 2009

Physica C: Superconductivity

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“…The improvement of the grain connections and the generation of new flux‐pinning centers dispersed in the MgB 2 matrix might be responsible for the improvement of J c . Since it has been reported that high pressure and high temperature have been actualized in synthesizing of MgB 2 24, our present work might provide another potential route to prepare high‐performance bulks and wires on an industrial scale.…”

Section: Discussionmentioning

confidence: 99%

Significant enhancement of critical current density in MgB₂ with HgO doping under high pressure

Cui

Chen

Yang

et al. 2010

Physica Status Solidi (a)

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A series of HgO-doped MgB 2 samples have been prepared under high pressure. Even 27 and 43 wt% impurities have been observed in the Mg 1.05Àx (HgO) x B 2 samples with x ¼ 0.05 and 0.075, the critical current density, J c , have been significantly improved under both low and high magnetic fields. XRD and scanning electron microscope (SEM) analyses revealed that HgO reacted with Mg to form MgHg alloy. The formation of MgHg alloy contributed not only to the refinement of MgB 2 grain size and improvement of grain connection, but also to homogeneous distribution of a large amount of impurities in the MgB 2 matrix. As a consequence, grain-boundary pinning was strengthened and new point pinning was generated. Effective improvement of flux pinning together with the very high impurity tolerance in HgO-doped MgB 2 samples might provide another potential route to prepare high-performance MgB 2 bulks and wires on an industrial scale.

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High-pressure–high-temperature synthesis of magnesium diboride with different additions

Cited by 6 publications

References 2 publications

Study on Thermodynamics and Kinetics for the Reaction of Magnesium Diboride and Water by Microcalorimetry

Study on Thermodynamics and Kinetics for the Reaction of Magnesium Diboride and Water by Microcalorimetry

Enhanced superconducting properties of Eu2O3-doped MgB2

Significant enhancement of critical current density in MgB₂ with HgO doping under high pressure

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High-pressure–high-temperature synthesis of magnesium diboride with different additions

Cited by 6 publications

References 2 publications

Study on Thermodynamics and Kinetics for the Reaction of Magnesium Diboride and Water by Microcalorimetry

Study on Thermodynamics and Kinetics for the Reaction of Magnesium Diboride and Water by Microcalorimetry

Enhanced superconducting properties of Eu2O3-doped MgB2

Significant enhancement of critical current density in MgB2 with HgO doping under high pressure

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Product

Resources

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Significant enhancement of critical current density in MgB₂ with HgO doping under high pressure