Skip to content

Research at St Andrews

Phase transition in perovskite oxide La0.75Sr0.25Cr0.5Mn0.5O3-d observed by in situ high temperature neutron powder diffraction

Research output: Contribution to journalArticle

DOI

Author(s)

School/Research organisations

Abstract

(La0.75Sr0.25)Cr0.5Mn0.5O3-delta (LSCM) has recently been shown to be an efficient redox stable anode for solid oxide fuel cells (SOFCs). The structure of LSCM has been investigated by X-ray diffraction and neutron diffraction to further understand its properties under SOFC operating conditions. Samples were prepared with nominal A-site deficiency; however, neutron diffraction demonstrates that the A-site deficiency is actually minimal or even null, with spinel impurity compensating for low content of A-site species. This was not apparent from XRD. The perovskite oxide La0.75Sr0.25Cr0.5Mn0.5O3 ( LSCM) exhibits a rhombohedral structure with space group R3c (167), a = 5.4479(1)A, beta = 60.477(1)degrees, and V = 115.563 A(3) at room temperature. Conductivity and thermal expansion data in air exhibit an anomalous change starting at similar to 400 degrees C which we here demonstrate as being correlated to a phase transition. The perovskite phase undergoes a R3c -> Pm3m, rhombohedral to cubic phase transition over the temperature range from 500 to over 1100 degrees C as observed using in situ high-temperature neutron powder diffraction. The fraction of the cubic phase increases with increasing temperature and reaches 85% at 1000 degrees C. The phase transition is gradual; therefore, any sudden volume change due to a phase transition would be minimized, allowing a good electrolyte/anode interface on thermal cycling. The reduced form of La0.75Sr0.25Cr0.5Mn0.5O3-delta exhibits a primitive cubic structure with space group Pm3m, which is the same as the major phase of La0.75Sr0.25Cr0.5Mn0.5O3 in air at high temperatures; therefore, the stresses due to phase changes on redox cycling may be minimized.

Close

Details

Original languageEnglish
Pages (from-to)5453-5460
Number of pages8
JournalChemistry of Materials
Volume18
Issue number23
DOIs
Publication statusPublished - 14 Nov 2006

    Research areas

  • FUEL-CELLS, ANODE, SYSTEM

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. An FeNbO4-based oxide anode for a solid oxide fuel cell (SOFC)

    Liu, X., Xie, D., Irvine, J. T. S., Ni, J. & Ni, C., 11 Jan 2020, In : Electrochimica Acta. In press, 135692.

    Research output: Contribution to journalArticle

  2. Oxygen redox activity through a reductive coupling mechanism in the P3-type nickel-doped sodium manganese oxide

    Kim, E. J., Ma, L. A., Duda, L. C., Pickup, D. M., Chadwick, A. V., Younesi, R., Irvine, J. T. S. & Armstrong, R., 6 Jan 2020, In : ACS Applied Energy Materials. Early View

    Research output: Contribution to journalArticle

  3. A B-site doped perovskite ferrate for efficient anode of a solid oxide fuel cell with in situ metal exsolution

    Ni, C., Zeng, Q., He, D., Peng, L., Xie, D., Irvine, J. T. S., Duan, S. & Ni, J., 21 Dec 2019, In : Journal of Materials Chemistry A. 7, 47, p. 26944-26953 10 p.

    Research output: Contribution to journalArticle

  4. Lattice strain-enhanced exsolution of nanoparticles in thin films

    Han, H., Park, J., Nam, S. Y., Choi, G. M., Parkin, S. S. P., Jang, H. M. & Irvine, J. T. S., 1 Dec 2019, In : Nature Communications. 10, 8 p., 1471.

    Research output: Contribution to journalArticle

  5. Hexagonal perovskite related oxide ion conductor Ba3NbMoO8.5: phase transition, temperature evolution of the local structure and properties

    Chambers, M. S., McCombie, K. S., Auckett, J. E., McLaughlin, A. C., Irvine, J. T. S., Chater, P. A., Evans, J. S. O. & Evans, I. R., 28 Nov 2019, In : Journal of Materials Chemistry. 7, 44, p. 25503-25510 8 p.

    Research output: Contribution to journalArticle

Related by journal

  1. Large crystalline domains and enhanced exciton diffusion length enable efficient organic solar cells

    Zhang, Y., Sajjad, M. T., Blaszczyk, O., Parnell, A. J., Ruseckas, A., Serrano, L. A., Cooke, G. & Samuel, I. D. W., 10 Sep 2019, In : Chemistry of Materials. 31, 17, p. 6548-6557

    Research output: Contribution to journalArticle

  2. n-type doping of organic semiconductors: immobilization via covalent anchoring

    Reiser, P., Benneckendorf, F. S., Barf, M-M., Müller, L., Bäuerle, R., Hillebrandt, S., Beck, S., Lovrincic, R., Mankel, E., Freudenberg, J., Jänsch, D., Kowalsky, W., Pucci, A., Jaegermann, W., Bunz, U. H. F. & Müllen, K., 11 Jun 2019, In : Chemistry of Materials. 31, 11, p. 4213-4221 9 p.

    Research output: Contribution to journalArticle

  3. A reinvestigation of Na2Fe2(C2O4)2H2O: an iron-based positive electrode for secondary batteries

    Yao, W., Sougrati, M-T., Hoang, K., Hui, J., Lightfoot, P. & Armstrong, A. R., 14 Nov 2017, In : Chemistry of Materials. 29, 21, p. 9095-9101

    Research output: Contribution to journalArticle

  4. Assembly-diassembly-organization-reassembly synthesis of zeolites based on cfi-type layers

    Firth, D. S., Morris, S. A., Wheatley, P. S., Russell, S. E., Slawin, A. M. Z., Dawson, D. M., Mayoral, A., Opanasenko, M., Položij, M., Čejka, J., Nachtigall, P. & Morris, R. E., 11 Jul 2017, In : Chemistry of Materials. 29, 13, p. 5605-5611

    Research output: Contribution to journalArticle

  5. Controlling of structural ordering and rigidity of β-SiAlON:Eu through chemical cosubstitution to approach narrow-band-emission for light-emitting diodes application

    Zhang, X., Fang, M-H., Tsai, Y-T., Lazarowska, A., Mahlik, S., Lesniewski, T., Grinberg, M., Pang, W. K., Pan, F., Liang, C., Zhou, W., Wang, J., Lee, J-F., Cheng, B-M., Hung, T-L., Chen, Y-Y. & Liu, R-S., 22 Aug 2017, In : Chemistry of Materials. 29, 16, p. 6781-6792

    Research output: Contribution to journalArticle

Related by journal

  1. Chemistry of Materials (Journal)

    Finlay Morrison (Reviewer)
    2009 → …

    Activity: Publication peer-review and editorial work typesPeer review of manuscripts

ID: 365767

Top