BaZrO3: the solution for the crucible corrosion problem during the single crystal growth of high-Tc superconductors REBa2Cu3O7−δ; RE = Y, Pr

Erb, A.; Wałker, E.; Flükiger, R.

doi:10.1016/0921-4534(95)00123-9

Cited by 211 publications

(124 citation statements)

References 24 publications

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“…The solid obtained is a mixture of zirconia and barium zirconate phases. This means that after 1 2 h at 90 C, the barium carbonate precipitation seems to be not quantitative. ICP analyses performed on the calcined gel show in fact that the Ba/Zr ratio is close to 0.1.…”

Section: Resultsmentioning

confidence: 99%

“…Erb et al showed that high density barium zirconate could be used as a substrate in the synthesis of high-Tc superconductors because it does not react with the liquid phases produced at high temperature during the process. 1 A simple method to synthetise barium zirconate can be the traditional solid state reaction route in which an appropriate amount of zirconia and barium carbonate are mixed together, ball milled to both enhance the homogeneity and reduce the particle size, before performing the heat treatment. 2 However, for such refractory materials, it is necessary to make several cycles of grinding/firing during a rather long heating time in order to complete the reaction.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of nanosized barium zirconate powder by thermal decomposition of urea in an aqueous solution containing barium and zirconium, and by calcination of the precipitate

Boschini

Robertz

Rulmont

et al. 2003

Journal of the European Ceramic Society

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The synthesis of barium zirconate was initiated by urea induced homogeneous precipitation followed by a ''low temperature'' thermal treatment. The kinetic of the reaction and the optimum urea/cation ratio have been determined by means of X-ray diffraction and Inductive Coupled Plasma analyses. It has been demonstrated that an amorphous zirconium hydrated oxide starts to precipitate followed by the precipitation of barium carbonate. A calcination at 1200 C during 2 h gives rise to the formation of a pure barium zirconate phase. Microstructural characterisations have been performed in order to evaluate the sintering behaviour. Dilatometric measurements, coupled with scanning electron microscopy analyses clearly indicate that barium carbonate decomposition process leads to the formation of internal porosity which severely limits the density of the material, even if a sintering was performed at 1500 C. A careful control of the heating profile seems to be necessary in order to produce dense materials. #

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of nanosized barium zirconate powder by thermal decomposition of urea in an aqueous solution containing barium and zirconium, and by calcination of the precipitate

Boschini

Robertz

Rulmont

et al. 2003

Journal of the European Ceramic Society

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“…Section IV discusses the implications of the NEXAFS results and, finally, the conclusions are drawn in Sec. V. 41,42,44 Well-reflecting flat ͑001͒ surfaces of the samples were obtained by cutting off the crystals' top layers using the diamond knife of an ultramicrotome.…”

Section: Introductionmentioning

confidence: 99%

X-ray absorption spectroscopy of detwinnedPrxY1−

et al. 1997

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UvA-DARE is a service provided by the library of the University of Amsterdam (http://dare.uva.nl) UvA-DARE (Digital Academic Repository)X-ray absorption spectroscopy of detwinned PrxY1-xBa2Cu3O7-y single crystals: electronic structure and hole distribution Merz, M.; Nücker, N.; Pellegrin, E.; Schweiss, P.; Schuppler, S.; Kielwein, M.; Knupfer, M.; Golden, M.S.; Fink, J. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Substituting Y in orthorhombic ͑Y,R)Ba 2 Cu 3 O 7 by any rare-earth element R has generally little effect on the superconducting properties. For RϭPr, however, superconductivity is completely suppressed. To understand this effect we have studied the unoccupied electronic structure of Pr x Y 1Ϫx Ba 2 Cu 3 O 7Ϫy (xϭ0.0, 0.4, 0.8) using polarization-dependent O 1s near-edge x-ray absorption spectroscopy of detwinned single crystals. We identify the hole states in the CuO 2 planes and the CuO 3 chains and give estimates of the relative contributions of the O 2p x , O 2p y , and O 2p z orbitals to these states. Along with the comparison of oxygen-rich (yϷ0.1) to the oxygen-depleted materials (yϷ0.9), this allows a test of the current theoretical explanations for the Pr-induced suppression of superconductivity. While we can rule out models involving hole filling or charge transfer between the planes and the chains, our data are consistent with approaches based on Pr 4f -O 2p hybridization. ͓S0163-1829͑97͒03313-4͔

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“…The experiments were performed on crystals which were grown in the recently developed non-reactive crucible material BaZrO 3 [3]. Crystals obtained from such experiments exhibit a superior purity since they are not contaminated with metallic impurities from the container material [4].…”

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confidence: 99%

Experimental evidence for fast cluster formation of chain oxygen vacancies in YBa2Cu3O7−δ as the origin of the fishtail anomaly

Erb

Manuel

Dhallé

et al. 1999

Solid State Communications

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We report on three different and complementary measurements, namely magnetisation measurements positron annihilation spectroscopy and NMR measurements, which give evidence that the formation of oxygen vacancy clusters is on the origin of the fishtail anomaly in YBa 2 Cu 3 O 7−δ . While in the case of YBa 2 Cu 3 O 7.0 the anomaly is intrinsically absent, it can be suppressed in the optimally doped state where vacancies are present. We therefore conclude that the single vacancies or point defects can not be responsible for this anomaly but that clusters of oxygen vacancies are on its origin.

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BaZrO3: the solution for the crucible corrosion problem during the single crystal growth of high-Tc superconductors REBa2Cu3O7−δ; RE = Y, Pr

Cited by 211 publications

References 24 publications

Preparation of nanosized barium zirconate powder by thermal decomposition of urea in an aqueous solution containing barium and zirconium, and by calcination of the precipitate

Preparation of nanosized barium zirconate powder by thermal decomposition of urea in an aqueous solution containing barium and zirconium, and by calcination of the precipitate

X-ray absorption spectroscopy of detwinnedPrxY1−

Experimental evidence for fast cluster formation of chain oxygen vacancies in YBa2Cu3O7−δ as the origin of the fishtail anomaly

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