TY - JOUR
T1 - Ferroelastic domain reorientations and its influence on mechanical properties of La0.6Sr0.4Co0.2Fe0.8O3-δ
AU - Kimura, Yuta
AU - Yashiro, Keiji
AU - Hashimoto, Shin Ichi
AU - Kawada, Tatsuya
N1 - Publisher Copyright:
© 2014 The Electrochemical Society.
PY - 2014
Y1 - 2014
N2 - The temperature dependency of the dynamic Young's modulus and of the internal friction of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF6428) was investigated by dynamic mechanical analysis. The significant decrease in the storage modulus of LSCF6428 with low oxygen vacancy concentration (LSCF1) and a following broad and asymmetric peak (P1) were interpreted as resulting from the motion of ferroelastic domain walls with a distribution of the relaxation time. The storage modulus of the LSCF6428 with higher oxygen vacancy concentration (LSCF2 and 3) was significantly larger than that of the LSCF1 at low temperatures. The P1 was barely observed with LSCF2 and 3. The increase in the storage modulus and the suppression of the peak P1 with increasing the oxygen vacancy concentration can be explained mainly by the pinning effect of the oxygen vacancies. This suggests that the oxygen vacancies play a vital role in determining the mobility of the ferroelastic domains in LSCF6428.
AB - The temperature dependency of the dynamic Young's modulus and of the internal friction of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF6428) was investigated by dynamic mechanical analysis. The significant decrease in the storage modulus of LSCF6428 with low oxygen vacancy concentration (LSCF1) and a following broad and asymmetric peak (P1) were interpreted as resulting from the motion of ferroelastic domain walls with a distribution of the relaxation time. The storage modulus of the LSCF6428 with higher oxygen vacancy concentration (LSCF2 and 3) was significantly larger than that of the LSCF1 at low temperatures. The P1 was barely observed with LSCF2 and 3. The increase in the storage modulus and the suppression of the peak P1 with increasing the oxygen vacancy concentration can be explained mainly by the pinning effect of the oxygen vacancies. This suggests that the oxygen vacancies play a vital role in determining the mobility of the ferroelastic domains in LSCF6428.
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U2 - 10.1149/2.0131411jes
DO - 10.1149/2.0131411jes
M3 - Article
AN - SCOPUS:84921315909
SN - 0013-4651
VL - 161
SP - F3079-F3083
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 11
ER -
