Low-Frequency Mechanical Spectroscopy of Lanthanum Cobaltite Based Mixed Conducting Oxides

• Autorzy: Wu X. S. , Cao J. F. , Chen Z. J. , Liu W.

Identyfikatory

DOI

10.1515/amm-2016-0272

• Języki publikacji: EN

Abstrakty

EN

The low-frequency mechanical spectra of lanthanum cobaltite based mixed conducting oxides have been measured using a computer-controlled inverted torsion pendulum. The results indicate that the internal friction spectra and shear modulus depend on the Sr doping contents (x). For undoped samples, no internal friction peak is observed. However, for La_0.8Sr_0.2CoO_3-δ, three internal friction peaks (P2, P3 and P4) are observed. In addition to these peaks, two more peaks (P0 and P1) are observed in La_0.6Sr_0.4CoO_3‒δ. The P0 and P1 peaks show characteristics of a phase transition, while the P2, P3 and P4 peaks are of relaxation-type. Our analysis suggests that the P0 peak is due to a phase separation and the P1 peak is related to the ferromagnetic–paramagnetic phase transition. The P2, P3 and P4 peaks are associated with the motion of domain walls. The formation of this kind of domain structure is a consequence of a transformation from the paraelastic cubic phase to the ferroelastic rhombohedral phase. With partial substitution of Fe for Co, only one peak is observed, which is discussed as a result of different microstructure.

Słowa kluczowe

EN

mixed conducting oxides; mechanical properties; domain structure; phase transition; mechanical spectroscopy; internal friction

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2016
• Tom: Vol. 61, iss. 3
• Strony: 1733--1738
• Opis fizyczny: Bibliogr. 31 poz., wykr.

Twórcy

autor

Wu X. S.

• Anhui Key Laboratory of Advanced Building Materials, School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, Anhui 230601, China

autor

Cao J. F.

• Anhui Key Laboratory of Advanced Building Materials, School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, Anhui 230601, China

autor

Chen Z. J.

• Laboratory of Advanced Functional Materials and Devices, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230022, China

autor

Liu W.

• Laboratory of Advanced Functional Materials and Devices, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230022, China

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Uwagi

EN

The research was supported by the National Natural Science Foundation of China (Grant No. 11204406).