Journal of Materials Research

Materials Communications

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

Bingxin Huanga1, Jürgen Malzbendera1 c1 and Rolf W. Steinbrecha1

a1 Forschungszentrum Jülich GmbH, 52428 Jülich, Germany

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.

(Received December 16 2010)

(Accepted May 03 2011)

(Online publication June 10 2011)

Key Words:

  • Elastic properties;
  • Internal friction;
  • Ceramic

Correspondence:

c1 Address all correspondence to this author. e-mail: j.malzbender@fz-juelich.de

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