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

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...

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Main Authors:	Wu Xiu Sheng, Cao Ju Fang, Chen Zhi Jun, Liu Wei
Format:	Article
Language:	English
Published:	Sciendo 2016-09-01
Series:	Archives of Metallurgy and Materials
Subjects:	Mixed conducting oxides mechanical properties domain structure phase transition mechanical spectroscopy internal friction
Online Access:	http://www.degruyter.com/view/j/amm.2016.61.issue-3/amm-2016-0272/amm-2016-0272.xml?format=INT

id	doaj-art-4efa665ad9fd4e9d9c522ac52b20f7d8
recordtype	oai_dc
spelling	doaj-art-4efa665ad9fd4e9d9c522ac52b20f7d82018-09-02T11:48:39ZengSciendoArchives of Metallurgy and Materials2300-19092016-09-016131733173810.1515/amm-2016-0272amm-2016-0272Low-Frequency Mechanical Spectroscopy of Lanthanum Cobaltite Based Mixed Conducting OxidesWu Xiu Sheng0Cao Ju Fang1Chen Zhi Jun2Liu Wei3 Anhui Key Laboratory of Advanced Building Materials, School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, Anhui 230601, China Anhui Key Laboratory of Advanced Building Materials, School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, Anhui 230601, China Laboratory of Advanced Functional Materials and Devices, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230022, China Laboratory of Advanced Functional Materials and Devices, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230022, ChinaThe 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 La0.8Sr0.2CoO3‒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 La0.6Sr0.4CoO3‒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.http://www.degruyter.com/view/j/amm.2016.61.issue-3/amm-2016-0272/amm-2016-0272.xml?format=INTMixed conducting oxidesmechanical propertiesdomain structurephase transitionmechanical spectroscopyinternal friction
institution	Open Data Bank
collection	Open Access Journals
building	Directory of Open Access Journals
language	English
format	Article
author	Wu Xiu Sheng Cao Ju Fang Chen Zhi Jun Liu Wei
spellingShingle	Wu Xiu Sheng Cao Ju Fang Chen Zhi Jun Liu Wei Low-Frequency Mechanical Spectroscopy of Lanthanum Cobaltite Based Mixed Conducting Oxides Archives of Metallurgy and Materials Mixed conducting oxides mechanical properties domain structure phase transition mechanical spectroscopy internal friction
author_facet	Wu Xiu Sheng Cao Ju Fang Chen Zhi Jun Liu Wei
author_sort	Wu Xiu Sheng
title	Low-Frequency Mechanical Spectroscopy of Lanthanum Cobaltite Based Mixed Conducting Oxides
title_short	Low-Frequency Mechanical Spectroscopy of Lanthanum Cobaltite Based Mixed Conducting Oxides
title_full	Low-Frequency Mechanical Spectroscopy of Lanthanum Cobaltite Based Mixed Conducting Oxides
title_fullStr	Low-Frequency Mechanical Spectroscopy of Lanthanum Cobaltite Based Mixed Conducting Oxides
title_full_unstemmed	Low-Frequency Mechanical Spectroscopy of Lanthanum Cobaltite Based Mixed Conducting Oxides
title_sort	low-frequency mechanical spectroscopy of lanthanum cobaltite based mixed conducting oxides
publisher	Sciendo
series	Archives of Metallurgy and Materials
issn	2300-1909
publishDate	2016-09-01
description	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 La0.8Sr0.2CoO3‒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 La0.6Sr0.4CoO3‒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.
topic	Mixed conducting oxides mechanical properties domain structure phase transition mechanical spectroscopy internal friction
url	http://www.degruyter.com/view/j/amm.2016.61.issue-3/amm-2016-0272/amm-2016-0272.xml?format=INT
_version_	1612645390335606784

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

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