Thermoanalytical features of YBa2Cu3O7 − x

Plewa, J.; Altenburg, H.; Hauck, J.

doi:10.1016/0040-6031(94)02135-b

Cited by 19 publications

(18 citation statements)

References 27 publications

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“…Instead of the desired phase composition 123+211, which as well as the pure 123-phase shows no DTA effects below 1000°C [20], the XRD curves reveal the existence of unwelcome 011-phase in almost all mixtures. Only in mixture (I) treated at 950°C there is no 011 phase.…”

Section: Influence Of a Preceding Thermal Treatmentmentioning

confidence: 92%

“…Concerning the mixtures, it has been shown by means of radiography [20,21], that 123 formation takes place during heating. Thus the second peak in Fig.…”

Section: Thermal Characteristics Of the Reactive Powder Mixturesmentioning

confidence: 99%

“…The phase transformation 7-BaCO3~I3 -BaCO3, taking place at about 810 o C reveal s a characteristic endothermal peak for carbon contents exceeding 1%. Lower carbon contents can only be detected coulometrically [20,21]. Figure 4 shows DTA plots of different precursor mixtures without (Fig.…”

Section: Influence Of Residual Bacomentioning

confidence: 99%

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Thermal investigations of reactive powder mixtures as precursors for melt-processing of YBa2Cu3O7−x

Plewa

Dibenedetto

Altenburg

et al. 1997

Journal of Thermal Analysis

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Section: Influence Of a Preceding Thermal Treatmentmentioning

confidence: 92%

“…Concerning the mixtures, it has been shown by means of radiography [20,21], that 123 formation takes place during heating. Thus the second peak in Fig.…”

Section: Thermal Characteristics Of the Reactive Powder Mixturesmentioning

confidence: 99%

See 1 more Smart Citation

Thermal investigations of reactive powder mixtures as precursors for melt-processing of YBa2Cu3O7−x

Plewa

Dibenedetto

Altenburg

et al. 1997

Journal of Thermal Analysis

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“…There are many attempts to use detailed models for description of the properties or the results of individual experiments with the Y123 phase, such as a temperature of transition between tetragonal and orthorhombic crystal phases, variation of the oxygen content with oxygen partial pressure and temperature, heat capacities with temperature, etc. [4,5,7]. This approach accounts for the particular phase behavior, but cannot be used for determination of data for thermodynamic equilibrium calculations, which need an appropriate characteristic function, such as the Gibbs energy.…”

Section: Thermodynamic Modelmentioning

confidence: 99%

“…Moreover, employment of several detailed models for description of one complete substance usually leads to discrepancies, because of the existence of rigorous interrelations between all thermodynamic properties. Hence, step-by-step consecutive interpretation of heat capacity, enthalpy, oxygen content, and other properties of the Y123 phase without employing any overall description results in equations that do not obey the thermodynamic laws [7,68]. In Ref.…”

Section: Thermodynamic Modelmentioning

confidence: 99%

Thermodynamic characterization of high-temperature superconductors in the yttrium-barium-copper-oxygen system. The Y123 solid solution (Technical Report)

Voronin

2000

Pure and Applied Chemistry

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Republication or reproduction of this report or its storage and/or dissemination by electronic means is permitted without the need for formal IUPAC permission on condition that an acknowledgment, with full reference to the source, along with use of the copyright symbol ©, the name IUPAC, and the year of publication, are prominently visible. Publication of a translation intoThermodynamic characterization of high-temperature superconductors in the yttrium-barium-copper-oxygen system. The Y123 solid solution Abstract: The aim of this report is to inform the chemical community about a selfconsistent thermodynamic data set for the YBa 2 Cu 3 O 6+z (1 ≥ z ≥ 0) solid solution, that is well known as the Y123 phase and possesses superconducting properties at z~1 and low temperatures. About 3300 experimental points obtained in 240 miscellaneous experiments published in 78 papers have been processed simultaneously in order to obtain the most reliable Gibbs energy function of the Y123 phase in the temperature range from 250 to 1300 K and pressures up to 100 kbar. A function is recommended for approximation of the Gibbs energy, which has 16 adjustable parameters. All other thermodynamic properties of the Y123 solution, including the conditions for its internal stability, can be derived from the assessed Gibbs energy. Brief descriptions of the thermodynamic model, experimental and data assessment methods as well as examples of self-consistent thermodynamic data applications are given.

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Synthesis and Physicochemical Properties of Nd‐, Sm‐, Eu‐Based Cuprate High‐Temperature Superconductors

Pęczkowski

Kowalik

Zachariasz

et al. 2018

Physica Status Solidi (a)

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The aim of the research is to create new high‐temperature superconductors (HTS) NdBa2Cu3O7−x, SmBa2Cu3O7−x, EuBa2Cu3O7−x, and Nd1/3Sm1/3Eu1/3Ba2Cu3O7−x based on light rare earth (LRE) metals. The superconducting materials are investigated for microstructural and physicochemical properties. The paper describes the preparation process of substrate powders and the granulation results of the raw material mixtures before the first calcination, as well as after the first and the second calcination. The granulation analysis of the raw materials are performed using a low‐angle laser light scattering (LALLS) method. Qualitative and quantitative phase analysis of the superconducting materials after the first and the second calcination and after annealing in oxygen atmosphere have been performed by X‐Ray diffraction (XRD) technique. A detailed structural investigations mainly shows the orthorhombic phase with small amounts of BaCuO2 and CuO compounds detected in all samples. A microstructural analysis of materials are carried out by using Raman spectroscopy and scanning electron microscopy (SEM), respectively. The magnetic properties of the superconducting materials are characterized by AC magnetic susceptibility as a function of temperature. The critical current densities at liquid nitrogen temperatures were also measured.

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Thermoanalytical features of YBa2Cu3O7 − x

Cited by 19 publications

References 27 publications

Thermal investigations of reactive powder mixtures as precursors for melt-processing of YBa2Cu3O7−x

Thermal investigations of reactive powder mixtures as precursors for melt-processing of YBa2Cu3O7−x

Thermodynamic characterization of high-temperature superconductors in the yttrium-barium-copper-oxygen system. The Y123 solid solution (Technical Report)

Synthesis and Physicochemical Properties of Nd‐, Sm‐, Eu‐Based Cuprate High‐Temperature Superconductors

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