Growth and characterization of Y−yPryBa2Cu3O7−x single crystals

Nevřiva, M.; Pollert, E.; Hejtmánek, J.; Durčok, S.; Šimečková, M.; Diko, P.

doi:10.1016/0921-4534(91)92169-c

Cited by 13 publications

(4 citation statements)

References 34 publications

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“…This is reasonable, since the presence of the Cu ion, which has the ability to be in different valence states in these compounds, can ensure simple charge balance. originally derived for pure Y-123: because of the negligible influence of R-Pr replacement on the lattice parameters, this approach appears justifiable for a GdPr-123 crystal; see for example [19]) and our lattice parameters, an average oxygen content of ≈6.89 was obtained (table 2).…”

Section: Resultsmentioning

confidence: 71%

Preparation and physical properties of the GdPr-123 system

Yamani¹,

Akhavan²

1997

Supercond. Sci. Technol.

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The Gd - Pr solid solution of the `123' crystal structure, (GdPr-123) with has been prepared by the standard solid-state reaction technique. Details of sample preparation and results of XRD, SEM, TGA, DT, , and measurements are reported. For , GdPr-123 is non-superconducting down to 10 K and does not show `metallic' conduction. Samples have a predominantly single-phase orthorhombic structure with Pmmm symmetry and a small percentage () of the Ba sites are occupied by Pr ions in some Pr-rich samples. The lower critical field value measured lies in the range of 10 mT. The nominal valence of the Cu ion in the whole range of x is determined; at the metal - semiconductor boundary , which is smaller by only 0.18 than the value 2.33 of the fully oxygenated (Gd-123) system. However, the valence of Pr is 3.86+. We suggest that the increasing band filling and localization of states due to the disorder effects together with Pr doping could cause the observed metal - semiconducting transition; qualitatively this is the same as the oxygen depletion case.

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Section: Resultsmentioning

confidence: 71%

Preparation and physical properties of the GdPr-123 system

Yamani¹,

Akhavan²

1997

Supercond. Sci. Technol.

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“…In spite of this our crystal growth experiments, e.g. [9] and [10], have confirmed the competency of the soaking method for the solid-liquid phase equilibria studies.…”

Section: Soaking Experimentsmentioning

confidence: 60%

Determination of phase diagram cuts in the system

Nevřiva¹,

Knı́žek²,

Pollert³

1996

Supercond. Sci. Technol.

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The solid-liquid equilibria in the BiO 1.5 -SrO-CaO-CuO system were investigated using a soaking procedure accompanied by subsequent chemical and x-ray analysis. The obtained results completed by literature data were employed in the construction of the phase diagrams for the sections of BiO 1.5 -(2 SrO+CaO)/ 3-CuO, BiO 1.5 -(3 SrO+2 CaO)/ 5-CuO and Bi 1.5 -(SrO+CaO)/2-CuO at 860 • C. Further, the evolution of the CuO+L-L liquidus curves in the temperature range of 820-880 • C was proposed.

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“…In the early years 1988-92 we got successfully engaged in studying phase diagrams in the YBCO system [4][5][6][7][8][9][10][11][12] and succeeded to investigate the pseudobinary cut of YCuO2.5--YBa2Cu306.5--BaCuO2 and the characteristics of YBa2Cu306. 5 phase [4].…”

Section: Our Previous Studies On the Yba2cu30 ~ Related Phasesmentioning

confidence: 99%

“…An improved experimental determination of oxide phase equilibria was proposed being based on the separation of the melt from an equilibrated sample by soaking melt into the supportiong Y203 pellet and the consequent analysis of its solid residual [5]. This method has been applied to growing single crystals [6]. It matured to several review articles [8][9][10][11][12][13][14][15] and consequent attempt to prepare YBCO doped polycrystalline materials through fast melt solidification and glass recrystallization [15][16][17][18].…”

Section: Our Previous Studies On the Yba2cu30 ~ Related Phasesmentioning

confidence: 99%

Some thermodynamic aspects of highT c superconductors

Šesták

Sedmidubský

Moiseev

1997

Journal of Thermal Analysis

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Thermochemical and thermodynamical properties of HTSC phases are reviewed for the Y-Ba-Cu--O system and also presented for the newly calculated Bi--Sr-Cu--O system stressing out stoichiometric and phenomenological viewpoints. Simulated data are listed for (/-/~298--/~o), phase transformation temperatures, standard entropies, standard enthalpies of formation, heat capacities in crystalline phase, etc. Pseudobinary phase diagrams are treated showing the effect of oxygen partial pressure particularly illustrated on the (Sr, Bi, Ba)--Cu--O system.

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Growth and characterization of Y−yPryBa2Cu3O7−x single crystals

Cited by 13 publications

References 34 publications

Preparation and physical properties of the GdPr-123 system

Preparation and physical properties of the GdPr-123 system

Determination of phase diagram cuts in the system

Some thermodynamic aspects of highT c superconductors

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