Correlation between crystal and transport properties in LnBa 0.5Sr0.5Co1.5Fe0.5O 5 + δ (Ln - Selected lanthanides, Y)

Konrad Świerczek, Naoya Yoshikura, Kun Zheng, Alicja Klimkowicz

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Selected LnBa0.5Sr0.5Co1.5Fe 0.5O5 + δ (Ln - Pr, Nd, Sm, Gd and Y) oxides were studied in terms of their phase composition, formation of cation-ordered crystal structure, oxygen nonstoichiometry and transport properties. Despite partial substitution of bigger Ba2 + by smaller Sr2 + cations, A-site (Ln-Ba,Sr) cation ordering in LnBa0.5Sr0.5Co 1.5Fe0.5O5 + δ is preserved, but only for smaller Ln cations (Y3 +, Gd3 +). In the case of SmBa0.5Sr0.5Co1.5Fe0.5O 5 + δ, the synthesis procedure yielded material partially ordered, while for Pr3 + and Nd3 + cations XRD measurements indicated formation of cation-disordered samples. Oxygen content in the disordered materials is close to stoichiometric one (δ ≈ 1) at room temperature, while for cation-ordered samples δ < 1. Thermogravimetric measurements indicated that above 250 °C a decrease of mass occurs for all of the studied materials. Except for Y-containing sample, larger mass loss at 800 °C occurs for materials with heavier Ln element. The ordered materials show higher activation energy of the electrical conductivity in 25-300 °C temperature range, as well as different temperature dependence of Seebeck coefficient, comparing to the disordered ones. The highest electrical conductivity was measured for PrBa0.5Sr0.5Co 1.5Fe0.5O5 + δ. For this compound the ionic conductivity at 800 °C was determined to be of the order of 0.03 S cm- 1.

Original languageEnglish
Pages (from-to)645-649
Number of pages5
JournalSolid State Ionics
Volume262
DOIs
Publication statusPublished - 2014 Sep 1

Fingerprint

Lanthanoid Series Elements
Rare earth elements
Transport properties
Cations
transport properties
Positive ions
cations
Crystals
crystals
Oxygen
electrical resistivity
Seebeck coefficient
heavy elements
oxygen
Ionic conductivity
Seebeck effect
Phase composition
Temperature
Oxides
ion currents

Keywords

  • Cation ordering in perovskites
  • Crystal structure
  • Mixed conductivity
  • Oxygen nonstoichiometry
  • Transport properties

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Correlation between crystal and transport properties in LnBa 0.5Sr0.5Co1.5Fe0.5O 5 + δ (Ln - Selected lanthanides, Y). / Świerczek, Konrad; Yoshikura, Naoya; Zheng, Kun; Klimkowicz, Alicja.

In: Solid State Ionics, Vol. 262, 01.09.2014, p. 645-649.

Research output: Contribution to journalArticle

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AU - Świerczek, Konrad

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AU - Zheng, Kun

AU - Klimkowicz, Alicja

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N2 - Selected LnBa0.5Sr0.5Co1.5Fe 0.5O5 + δ (Ln - Pr, Nd, Sm, Gd and Y) oxides were studied in terms of their phase composition, formation of cation-ordered crystal structure, oxygen nonstoichiometry and transport properties. Despite partial substitution of bigger Ba2 + by smaller Sr2 + cations, A-site (Ln-Ba,Sr) cation ordering in LnBa0.5Sr0.5Co 1.5Fe0.5O5 + δ is preserved, but only for smaller Ln cations (Y3 +, Gd3 +). In the case of SmBa0.5Sr0.5Co1.5Fe0.5O 5 + δ, the synthesis procedure yielded material partially ordered, while for Pr3 + and Nd3 + cations XRD measurements indicated formation of cation-disordered samples. Oxygen content in the disordered materials is close to stoichiometric one (δ ≈ 1) at room temperature, while for cation-ordered samples δ < 1. Thermogravimetric measurements indicated that above 250 °C a decrease of mass occurs for all of the studied materials. Except for Y-containing sample, larger mass loss at 800 °C occurs for materials with heavier Ln element. The ordered materials show higher activation energy of the electrical conductivity in 25-300 °C temperature range, as well as different temperature dependence of Seebeck coefficient, comparing to the disordered ones. The highest electrical conductivity was measured for PrBa0.5Sr0.5Co 1.5Fe0.5O5 + δ. For this compound the ionic conductivity at 800 °C was determined to be of the order of 0.03 S cm- 1.

AB - Selected LnBa0.5Sr0.5Co1.5Fe 0.5O5 + δ (Ln - Pr, Nd, Sm, Gd and Y) oxides were studied in terms of their phase composition, formation of cation-ordered crystal structure, oxygen nonstoichiometry and transport properties. Despite partial substitution of bigger Ba2 + by smaller Sr2 + cations, A-site (Ln-Ba,Sr) cation ordering in LnBa0.5Sr0.5Co 1.5Fe0.5O5 + δ is preserved, but only for smaller Ln cations (Y3 +, Gd3 +). In the case of SmBa0.5Sr0.5Co1.5Fe0.5O 5 + δ, the synthesis procedure yielded material partially ordered, while for Pr3 + and Nd3 + cations XRD measurements indicated formation of cation-disordered samples. Oxygen content in the disordered materials is close to stoichiometric one (δ ≈ 1) at room temperature, while for cation-ordered samples δ < 1. Thermogravimetric measurements indicated that above 250 °C a decrease of mass occurs for all of the studied materials. Except for Y-containing sample, larger mass loss at 800 °C occurs for materials with heavier Ln element. The ordered materials show higher activation energy of the electrical conductivity in 25-300 °C temperature range, as well as different temperature dependence of Seebeck coefficient, comparing to the disordered ones. The highest electrical conductivity was measured for PrBa0.5Sr0.5Co 1.5Fe0.5O5 + δ. For this compound the ionic conductivity at 800 °C was determined to be of the order of 0.03 S cm- 1.

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