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Elastic anomaly and internal friction of Ba0.5Sr0.5Co0.8Fe0.2O3-δ and La0.58Sr0.4Co0.2Fe0.8O3-δ

Published online by Cambridge University Press:  10 June 2011

Bingxin Huang ,
Jürgen Malzbender  and
Rolf W. Steinbrech
Bingxin Huang
Affiliation:
Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
Jürgen Malzbender*
Affiliation:
Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
Rolf W. Steinbrech
Affiliation:
Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Elastic modulus and internal friction of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) and La0.58Sr0.4Co0.2Fe0.8O3-δ (LSCF) were determined from resonance frequencies and damping behavior, respectively, using an impulse excitation method. An elastic anomaly for BSCF around 476 K, with a corresponding peak in the internal friction, is attributed to the experimentally confirmed spin transition of Co3+. LSCF is in a ferromagnetic state below ∼220 K and in a paramagnetic state above ∼250 K. The elastic modulus of LSCF exhibits an anomaly between 473 and 1113 K, which is attributed to a transition from rhombohedral to cubic symmetry.

Keywords

Elastic propertiesInternal frictionCeramic
Type
Materials Communications
Information
Journal of Materials Research , Volume 26 , Issue 11 , 14 June 2011 , pp. 1388 - 1391
Copyright
Copyright © Materials Research Society 2011

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