TY - JOUR
T1 - Crystal structure and thermal expansion behavior of oxygen stoichiometric lanthanum strontium manganite at high temperature
AU - Shirai, Yoshikazu
AU - Hashimoto, Shin Ichi
AU - Sato, Kazuhisa
AU - Yashiro, Keiji
AU - Amezawa, Koji
AU - Mizusaki, Junichiro
AU - Kawada, Tatsuya
N1 - Funding Information:
This work was made as a part of the research project on development of systems and elemental technology of SOFC, which was supported by the New Energy and Industrial Technology Development Organization (NEDO), Japan .
PY - 2014/3/1
Y1 - 2014/3/1
N2 - In this study, the crystal structures and the thermal expansibilities of La1 - xSrxMnO3 + δ (LSM) with oxygen stoichiometric composition, δ = 0, were studied by an atmosphere and temperature controlled X-Ray diffractometer (XRD). Pre-heat-treatment conditions for the samples and oxygen partial pressures for XRD measurements at high temperature were carefully selected to keep oxygen stoichiometric composition. The crystal structures of La1 - xSrxMnO3 at room temperature were rhombohedral, tetragonal, and cubic symmetry for 0.2 ≤ x ≤ 0.45, 0.5 ≤ x ≤ 0.6, x = 0.7, respectively. The second order phase transition from rhombohedral to cubic symmetry was confirmed for x = 0.4 compound at 923-973 K. Meanwhile, the second order phase transition from tetragonal to cubic symmetry was confirmed for x = 0.5 compound at 623-673 K, x = 0.6 compound at 423-473 K, respectively. Furthermore, the pure thermal expansibilities of LSM without chemical expansion were discussed based on XRD analysis.
AB - In this study, the crystal structures and the thermal expansibilities of La1 - xSrxMnO3 + δ (LSM) with oxygen stoichiometric composition, δ = 0, were studied by an atmosphere and temperature controlled X-Ray diffractometer (XRD). Pre-heat-treatment conditions for the samples and oxygen partial pressures for XRD measurements at high temperature were carefully selected to keep oxygen stoichiometric composition. The crystal structures of La1 - xSrxMnO3 at room temperature were rhombohedral, tetragonal, and cubic symmetry for 0.2 ≤ x ≤ 0.45, 0.5 ≤ x ≤ 0.6, x = 0.7, respectively. The second order phase transition from rhombohedral to cubic symmetry was confirmed for x = 0.4 compound at 923-973 K. Meanwhile, the second order phase transition from tetragonal to cubic symmetry was confirmed for x = 0.5 compound at 623-673 K, x = 0.6 compound at 423-473 K, respectively. Furthermore, the pure thermal expansibilities of LSM without chemical expansion were discussed based on XRD analysis.
KW - Cathode
KW - LSM
KW - Lattice parameter
KW - Phase transition
KW - SOFC
KW - Thermal expansion
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U2 - 10.1016/j.ssi.2013.12.042
DO - 10.1016/j.ssi.2013.12.042
M3 - Article
AN - SCOPUS:84893123321
VL - 256
SP - 83
EP - 88
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
ER -