Synthesis, crystal structure and properties of Hg2Ba2(Y, Ca) Cu2O8−δ: the first cuprate superconductor containing a double mercury-oxygen layer

Radaelli, P. G.; Marezio, M.; Tholence, J.L.; Brion, S. de; Loureiro, S.M.; Santoro, A.; Huang, Qiang; Capponi, J.J.; Alario-Franco, M.Á.; Chaillout, C.

doi:10.1016/0921-4534(94)91687-x

Cited by 11 publications

(12 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…O75, O80 or SC, the Hg-2212 phase obtained after quenching was identical to the phase observed during the HP-HT synthesis. Preliminary calculations for refining the structure of the compound O75 showed an identical structure with that previously published [7].…”

Section: Resultssupporting

confidence: 72%

See 1 more Smart Citation

Present state of research on the sorption of inorganic compounds by oxide hydroxides from aqueous solutions

Pechenyuk¹

1992

Russ. Chem. Rev.

View full text Add to dashboard Cite

In this experiment we investigated the synthesis of the double mercury layer compound Hg 2 Ba 2 YCu 2 O 8−δ (Hg-2212) at 4 GPa and 900 • C by in situ x-ray diffraction performed at the high-pressure ID30 beam line at ESRF. The chemical path observed depends on the choice of the initial mixture. If one starts from a mixture of oxides and copper, an intermediate oxide phase (a high-pressure variety) containing barium and mercury is formed (we do not know if copper is present). This intermediate phase is then converted into the final Hg-2212 product. On the other hand, Hg-2212 grows directly from a pre-reacted precursor 'Ba 2 YCu 2 O y ' mixed with HgO. This in situ technique clearly shows its efficiency in identifying, in real time, a phase that would have been difficult to observe ex situ.

show abstract

Section: Resultssupporting

confidence: 72%

“…The prototype compound Hg 2 Ba 2 YCu 2 O 8−δ was first § Author to whom correspondence should be addressed. synthesized in 1994 by Radaelli et al [6,7]. Neutron powder diffraction characterizations revealed a charge reservoir containing Hg 2 O 2−δ layers.…”

Section: Introductionmentioning

confidence: 99%

Present state of research on the sorption of inorganic compounds by oxide hydroxides from aqueous solutions

Pechenyuk¹

1992

Russ. Chem. Rev.

View full text Add to dashboard Cite

show abstract

“…Two synthesis routes were tried, as explained in previous papers (9; 23 2 because it is very difficult to prepare BaCuO 2 without any trace of carbon contamination. The 95 % purity of the commercial BaO 2 , which contains traces of barium carbonate, was also not considered sufficient.…”

Section: Methodsmentioning

confidence: 99%

Enhancement of Tc by Sr substitution for Ba in Hg-2212 superconductor

Toulemonde¹,

Odier²

2004

Physica C: Superconductivity

View full text Add to dashboard Cite

The Ba substitution by Sr has been studied in two Hg-2212 The y = 0 compound of the first series is the non superconducting Hg 2 Ba 2 YCu 2 O 8−δ prototype. In the second series, this y = 0 compound is already superconducting at 21 K. Indeed the members of this series present a higher charge carrier density in their CuO 2 superconducting planes than their homologues of the first series due to the doping introduced by the substitution of 20 % of Y by Ca. The compounds of both series were synthesized in high pressure (3.5 GPa) -high temperature (950 -1050˚C) conditions. In both cases Sr substitution was successful up to the full replacement of Ba (y = 1.0). The Hg-2212 phases were characterized by XRD, SEM, EDX and a.c. susceptibility.

show abstract

“…The high pressure-high temperature (HP-HT) process allows one to obtain nearly pure HgBa 2 Ca n−1 Cu n O 2+2n+δ mercury based cuprate superconductors, even for n > 3 [1,2]. It is also efficient for the synthesis of the Hg 2 Ba 2 YCu 2 O 8−δ compound (Hg-2212) [3][4][5]. In Hg 2 Ba 2 YCu 2 O 8−δ a strong oxygen deficiency (δ ∼ 0.4-0.5) inhibits superconductivity.…”

Section: Introductionmentioning

confidence: 99%

The effect of Sr substitution on superconductivity in Hg₂(Ba_1 ySr_y)₂YCu₂O₈: I. A neutron powder diffraction study

Toulemonde¹,

Odier²,

Bordet³

et al. 2004

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

The effect of Sr chemical pressure on superconductivity was investigated in Hg 2 (Ba 1−y Sr y ) 2 YCu 2 O 8−δ . The samples were synthesized at high pressure and high temperature from y = 0.0 to full substitution, y = 1.0. These Sr substituted compounds are superconducting, without Ca doping on the Y site, and show a T c increasing with Sr, reaching 42 K for y = 1.0. A detailed neutron powder diffraction study compares the structural changes induced by this chemical Sr/Ba substitution and the mechanical pressure effects in the Hg-2212 system. It shows the strong decrease of the three Ba/Sr-O distances and consequently the shrinkage of Cu-O1 in−plane and Cu-O2 apical bonds. These structural changes, by affecting the charge transfer which occurs between the charge reservoir and the superconducting block, are responsible of the T c enhancement with Sr content.

show abstract

Synthesis, crystal structure and properties of Hg2Ba2(Y, Ca) Cu2O8−δ: the first cuprate superconductor containing a double mercury-oxygen layer

Cited by 11 publications

References 2 publications

Present state of research on the sorption of inorganic compounds by oxide hydroxides from aqueous solutions

Present state of research on the sorption of inorganic compounds by oxide hydroxides from aqueous solutions

Enhancement of Tc by Sr substitution for Ba in Hg-2212 superconductor

The effect of Sr substitution on superconductivity in Hg₂(Ba_1 ySr_y)₂YCu₂O₈: I. A neutron powder diffraction study

Contact Info

Product

Resources

About

Synthesis, crystal structure and properties of Hg2Ba2(Y, Ca) Cu2O8−δ: the first cuprate superconductor containing a double mercury-oxygen layer

Cited by 11 publications

References 2 publications

Present state of research on the sorption of inorganic compounds by oxide hydroxides from aqueous solutions

Present state of research on the sorption of inorganic compounds by oxide hydroxides from aqueous solutions

Enhancement of Tc by Sr substitution for Ba in Hg-2212 superconductor

The effect of Sr substitution on superconductivity in Hg2(Ba1 ySry)2YCu2O8 : I. A neutron powder diffraction study

Contact Info

Product

Resources

About

The effect of Sr substitution on superconductivity in Hg₂(Ba_1 ySr_y)₂YCu₂O₈: I. A neutron powder diffraction study