Measurements of anisotropic thermopower of magnetically aligned YBa2Cu3O7-δ ceramics: Evidence of successful texturing techniques

C. J. Liu, T. W. Wu, J. Downes, M. P. Staines

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Aligned YBa2Cu3O7-δ ceramics have been obtained using a field of 1 T without being embedded in epoxy. Thermopower, XRD, and SEM are used to characterize the aligned ceramics. For the sample with δ = 0.05, the thermopower exhibits a strong anisotropy. The ab-plane thermopower behaves distinctly from that along the c-axis. The ab-plane thermopower shows remarkable similarities to that along the b-axis in an untwinned single crystal. The magnitude and temperature dependence of the c-axis thermopower are almost identical to those of a twinned single crystal. For samples with larger oxygen deficiency, the anisotropy remains. These measurements indicate that these ceramics are well aligned along their crystallographic directions. This also makes available the anisotropic thermopower measurements of ceramic samples by aligning polycrystallites using magnetic forces.

Original languageEnglish
Pages (from-to)374-378
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume390
Issue number4
DOIs
Publication statusPublished - 2003 Jul 15

Fingerprint

Texturing
Thermoelectric power
ceramics
anisotropy
single crystals
hypoxia
Anisotropy
Single crystals
temperature dependence
scanning electron microscopy
barium copper yttrium oxide
Oxygen
Scanning electron microscopy

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

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abstract = "Aligned YBa2Cu3O7-δ ceramics have been obtained using a field of 1 T without being embedded in epoxy. Thermopower, XRD, and SEM are used to characterize the aligned ceramics. For the sample with δ = 0.05, the thermopower exhibits a strong anisotropy. The ab-plane thermopower behaves distinctly from that along the c-axis. The ab-plane thermopower shows remarkable similarities to that along the b-axis in an untwinned single crystal. The magnitude and temperature dependence of the c-axis thermopower are almost identical to those of a twinned single crystal. For samples with larger oxygen deficiency, the anisotropy remains. These measurements indicate that these ceramics are well aligned along their crystallographic directions. This also makes available the anisotropic thermopower measurements of ceramic samples by aligning polycrystallites using magnetic forces.",
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Measurements of anisotropic thermopower of magnetically aligned YBa2Cu3O7-δ ceramics : Evidence of successful texturing techniques. / Liu, C. J.; Wu, T. W.; Downes, J.; Staines, M. P.

In: Physica C: Superconductivity and its applications, Vol. 390, No. 4, 15.07.2003, p. 374-378.

Research output: Contribution to journalArticle

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