Synthesis of monophase HgBa2CuO4+δ under controlled partial oxygen pressure

Alyoshin, V. A.; Mikhailova, Daria; Антипов, Е.В.

doi:10.1016/0921-4534(95)00633-8

Cited by 47 publications

(9 citation statements)

References 13 publications

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“…At lower oxygen pressure inside the reaction vessel a larger temperature range can be chosen for the synthesis of Hg-1201. Earlier (13) we have shown that synthesis of monophase Hg-1201 samples is indeed much more successful if it is performed at P(O 2 )40.2 atm. Similar conclusions can be made for the synthesis of HgBa 2 CaCu 2 O >B and HgBa 2 Ca 2 Cu 3 O >B when thermodynamic data are available and compared with the data for CaHgO 2 obtained in the present work.…”

Section: Resultsmentioning

confidence: 86%

Thermogravimetric Study of MHgO2 (M=Ca, Sr, Ba) under Controlled Oxygen and Mercury Partial Pressures and Related Thermodynamics

Mikhailova

Alyoshin

Антипов

et al. 1999

Journal of Solid State Chemistry

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Section: Resultsmentioning

confidence: 86%

Thermogravimetric Study of MHgO2 (M=Ca, Sr, Ba) under Controlled Oxygen and Mercury Partial Pressures and Related Thermodynamics

Mikhailova

Alyoshin

Антипов

et al. 1999

Journal of Solid State Chemistry

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“…Partial oxygen pressure P(O 2 ) inside a sealed tube is also a very important synthesis parameter. Its variation leads to changes in partial mercury pressure P(Hg) as well as mercury mass in the gaseous phase and, finally, the phase composition of the product as a result [12].…”

Section: Synthesis In Sealed Silica Tubesmentioning

confidence: 99%

Chemistry and structure of Hg-based superconducting Cu mixed oxides

Антипов

Abakumov

Putilin

2002

Supercond. Sci. Technol.

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The most relevant aspects of thermodynamics, preparation, crystal structure and superconducting properties under ambient and high pressure of HgBa2Can−1CunO2n+2+δ superconductors are reviewed in this contribution. The ideas which inspired authors to search for the new superconductors among Hg-based complex cuprates are discussed as an example illustrating the benefit of the concept of intergrowth structure formation for the design of new layered materials. Recent results on solid–gas equilibriums useful for reproducible syntheses of different homologues are summarized. The crystal structures are discussed with main attention focused on features such as concentration and location of extra oxygen atoms, static atomic displacements due to partial occupation of oxygen site in a Hg-layer, substitution in a Hg position and a presence of stacking faults. It is shown that these factors have to be taken into account for a correct structure description. The relationships between Tc, doping level, amount and formal charge of extra anions and external pressure are outlined to predict possible paths for enhancement of the superconducting properties in complex cuprates.

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“…However, the method lacks sensitivity because of the low peroxidic oxygen content; for this reason, it is much more useful to simplify the problem by considering the polyvalent metal as being solely responsible for the oxygen non-stoichiometry . ), Gippius et al (1997) ; (^), Itoh et al (1993) ; ( ), Chmaissem et al (1993), Asab et al (1995) , Aksenov et al (1997a,b), Alyoshin et al (1995), Abakumov et al (1998), Tokiwa-Yamamoto et al (1997) and Bordet et al (1997). ), Gippius et al (1997) ; (^), Itoh et al (1993) ; ( ), Chmaissem et al (1993), Asab et al (1995) , Aksenov et al (1997a,b), Alyoshin et al (1995), Abakumov et al (1998), Tokiwa-Yamamoto et al (1997) and Bordet et al (1997).…”

Section: } 3 R Esults and Discussionmentioning

confidence: 97%

“…It is well known that the superconducting phase is sensitive to the oxygen content¯; Alyoshin et al (1996) have derived a complex equilibrium constant taking into account the partial pressure of O 2 and mercury. However, if we compare the results of several workers, some areas still have to be clari® ed.…”

Section: } 3 R Esults and Discussionmentioning

confidence: 99%

A contribution to the study of the Hg-Ba-Cu-O system

Costa¹

2000

Philosophical Magazine B

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This work aims to contribute to the study of the Hg± Ba± Cu± O diagram. Generally, we can see that high-temperature superconductor phase diagrams are far from complete. Of these, the Hg± Ba± Cu± O diagram is very interesting owing to the high mercury fugacity. However, to study this diagram it is necessary to control both the mercury and the oxygen activities. The importance of this check is evident in the preparation of single-phase samples, where competitive phases are often obtained; knowledge of these phases will provide an improvement. Even the famous superconductor phase HgBa 2 CuO 4 ‡¯i s still the subject of discussion. To study these compounds, thermogravimetric and di erential thermal analyses, X-ray di ractometry, scanning electron microscopy and oxygen titration are the most important analyses. In particular, we applied the well known e usion technique, a programmed decomposition by the saturated vapour method, rarely used for this purpose.

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Synthesis of monophase HgBa2CuO4+δ under controlled partial oxygen pressure

Cited by 47 publications

References 13 publications

Thermogravimetric Study of MHgO2 (M=Ca, Sr, Ba) under Controlled Oxygen and Mercury Partial Pressures and Related Thermodynamics

Thermogravimetric Study of MHgO2 (M=Ca, Sr, Ba) under Controlled Oxygen and Mercury Partial Pressures and Related Thermodynamics

Chemistry and structure of Hg-based superconducting Cu mixed oxides

A contribution to the study of the Hg-Ba-Cu-O system

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