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Title: Crystal Structure and Coordination of B-Cations in the Ruddlesden–Popper Phases Sr3-xPrx(Fe1.25Ni0.75)O7-δ(0 ≤ x ≤ 0.4)

Abstract

Compounds Sr3-xPrxFe1.25Ni0.75O7-δ with 0 ≤ x ≤ 0.4 and Ruddlesden–Popper n = 2 type structures were synthesized and investigated by X-ray and neutron powder diffraction, thermogravimetry, and Mössbauer spectroscopy. Both samples, prepared at 1300 °C under N2(g) flow and samples subsequently air-annealed at 900 °C, were studied. The structures contained oxygen vacancies in the perovskite layers, and the Fe/Ni cations had an average coordination number less than six. The oxygen content was considerably higher for air-annealed samples than for samples prepared under N2, 7 - δ = ~6.6 and ~5.6 per formula unit, respectively. Mössbauer data collected at 7 K, below magnetic ordering temperatures, were consistent with X-ray powder diffraction (XRD) and neutron powder diffraction (NPD) results. The electrical conductivity was considerably higher for the air-annealed samples and was for x = 0.1~30 S·cm-1 at 500 °C. The thermal expansion coefficients were measured in air between room temperature and 900 °C and was found to be 20–24 ppm·K-1 overall.

Authors:
 [1];  [2];  [3];  [4]; ORCiD logo [5];  [6];  [2]
  1. Stockholm Univ. (Sweden). Department of Materials and Environmental Chemistry
  2. Stockholm Univ. (Sweden). Department of Materials and Environmental Chemistry
  3. Stockholm Univ. (Sweden). Department of Materials and Environmental Chemistry; Catalonia Institute for Energy Research (Spain); STFC Rutherford Appleton Laboratory, Didcot (United Kingdom). The ISIS Facility
  4. Universitè de Liège (Belgium). GREENMAT, Institute of Chemistry B63APTIS, Institute of Physics
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  6. M.V. Lomonosov Moscow State University (Russia). Department of Chemistry
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1468058
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Inorganics
Additional Journal Information:
Journal Volume: 6; Journal Issue: 3; Journal ID: ISSN 2304-6740
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Ruddlesden–Popper structure; oxygen non-stoichiometry; crystal structure; Mössbauer spectroscopy; electrical conductivity; thermal expansion

Citation Formats

Svensson, Gunnar, Samain, Louise, Biendicho, Jordi, Mahmoud, Abdelfattah, Hermann, Raphaël, Istomin, Sergey, and Grins, Jekabs. Crystal Structure and Coordination of B-Cations in the Ruddlesden–Popper Phases Sr3-xPrx(Fe1.25Ni0.75)O7-δ(0 ≤ x ≤ 0.4). United States: N. p., 2018. Web. doi:10.3390/inorganics6030089.
Svensson, Gunnar, Samain, Louise, Biendicho, Jordi, Mahmoud, Abdelfattah, Hermann, Raphaël, Istomin, Sergey, & Grins, Jekabs. Crystal Structure and Coordination of B-Cations in the Ruddlesden–Popper Phases Sr3-xPrx(Fe1.25Ni0.75)O7-δ(0 ≤ x ≤ 0.4). United States. https://doi.org/10.3390/inorganics6030089
Svensson, Gunnar, Samain, Louise, Biendicho, Jordi, Mahmoud, Abdelfattah, Hermann, Raphaël, Istomin, Sergey, and Grins, Jekabs. 2018. "Crystal Structure and Coordination of B-Cations in the Ruddlesden–Popper Phases Sr3-xPrx(Fe1.25Ni0.75)O7-δ(0 ≤ x ≤ 0.4)". United States. https://doi.org/10.3390/inorganics6030089. https://www.osti.gov/servlets/purl/1468058.
@article{osti_1468058,
title = {Crystal Structure and Coordination of B-Cations in the Ruddlesden–Popper Phases Sr3-xPrx(Fe1.25Ni0.75)O7-δ(0 ≤ x ≤ 0.4)},
author = {Svensson, Gunnar and Samain, Louise and Biendicho, Jordi and Mahmoud, Abdelfattah and Hermann, Raphaël and Istomin, Sergey and Grins, Jekabs},
abstractNote = {Compounds Sr3-xPrxFe1.25Ni0.75O7-δ with 0 ≤ x ≤ 0.4 and Ruddlesden–Popper n = 2 type structures were synthesized and investigated by X-ray and neutron powder diffraction, thermogravimetry, and Mössbauer spectroscopy. Both samples, prepared at 1300 °C under N2(g) flow and samples subsequently air-annealed at 900 °C, were studied. The structures contained oxygen vacancies in the perovskite layers, and the Fe/Ni cations had an average coordination number less than six. The oxygen content was considerably higher for air-annealed samples than for samples prepared under N2, 7 - δ = ~6.6 and ~5.6 per formula unit, respectively. Mössbauer data collected at 7 K, below magnetic ordering temperatures, were consistent with X-ray powder diffraction (XRD) and neutron powder diffraction (NPD) results. The electrical conductivity was considerably higher for the air-annealed samples and was for x = 0.1~30 S·cm-1 at 500 °C. The thermal expansion coefficients were measured in air between room temperature and 900 °C and was found to be 20–24 ppm·K-1 overall.},
doi = {10.3390/inorganics6030089},
url = {https://www.osti.gov/biblio/1468058}, journal = {Inorganics},
issn = {2304-6740},
number = 3,
volume = 6,
place = {United States},
year = {2018},
month = {8}
}

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