Copper Deficiency - a Crystallochemical Nature of Ce-Doped Gd_2CuO_4 Phase. Part II

• Authors: R. Horyń , E. Bukowska , A. Sikora , M. Wołcyrz
• Languages of publication: EN

Abstracts

EN

Two samples of nominal composition Gd_{1.80}Ce_{0.15}CuO_{4.0} and Gd_{1.85}Ce_{0.15}CuO_{4.075} were subjected for a long-term treatment in air at 1100°C, comprised with a precise control of their weights vs. time of the treatment applied. The gravimetric analysis and the iodometric titration, both showed a deficiency on Cu-site, steadily increasing vs. time with a slight tendency to a saturation. The X-ray analysis of the resulting products showed that even after 272 h of sintering, the samples remained single phase of the "214" structure type. Refinement of their crystal structures as well as density measurements, both allowed confirming Cu deficient structure constitution of these samples. Results of dc-magnetization measurements, performed prior to reduction of the sample's overall oxygen content, did not show any sign of superconductivity down to 4.2 K. These preliminary results indicate that copper deficiency, developing during synthesis, may occur to be a decisive factor for the reported lack of superconductivity in Ce-doped Gd_2CuO_4 phase. Oxygen content reduction and further tests on the samples obtained are in progress.

Keywords

EN

64.75.+g; 81.40.Rs; 75.50.-y; 72.20.My

Discipline

• 75.50.-y: Studies of specific magnetic materials
• 72.20.My: Galvanomagnetic and other magnetotransport effects
• 81.40.Rs: Electrical and magnetic properties related to treatment conditions

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 106
• Issue: 5
• Pages: 733-738

Dates

published

2004-11

received

2004-06-06

Contributors

author

R. Horyń

• Institute for Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-420 Wrocław, Poland

author

E. Bukowska

• Institute for Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-420 Wrocław, Poland

author

A. Sikora

• Institute for Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-420 Wrocław, Poland

author

M. Wołcyrz

• Institute for Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-420 Wrocław, Poland

References

• 1. R. Horyń, A. Sikora, E. Bukowska, Acta Phys. Pol. A, 106, 727, 2004
• 2. A.I. Nazal, V.Y. Lee, E.M. Engler, R.D. Jacowitz, Y. Tokura, J.B. Torrance, Physica C, 153-155, 1367, 1988
• 3. R. Horyń, Z. Bukowski, M. Wolcyrz, J. Solid State Chem., 122, 321, 1996
• 4. J. Rodriguez-Carvayal, Physica B, 192, 55, 1993
• 5. E. Moran, A.I. Nazal, R.C. Huang, J.B. Torrance, Physica C, 160, 30, 1989

Identifiers

DOI

10.12693/APhysPolA.106.733