Mechanical spectrum and interstitial oxygen in YBaCuFeO5+δ

• Published in: Solid state sciences Vol. 14; no. 1; pp. 84 - 88
• Main Authors: YUAN, Y. H, YING, X. N
• Format: Journal Article
• Language: English
• Published: Issy-les-Moulineaux Elsevier Masson 2012
• Subjects: Anelasticity, internal friction, stress relaxation, and mechanical resonances; Condensed matter: structure, mechanical and thermal properties; Correlation; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; INTERNAL FRICTION; INTERSTITIALS; Iron; Materials science; Mechanical and acoustical properties of condensed matter; OXYGEN; Oxygen content; Perovskites; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Reeds; Solidification; Stress concentration; SUPERCONDUCTORS; THERMOGRAVIMETRIC ANALYSIS; YTTRIUM OXIDE; High-temperature superconductors; Internal friction; Interstitials; Thermogravimetry; Ultrasonic waves; Iron; Perovskites; Phase transitions; Nonstoichiometry; Solidification; Ultrasonics; Sintering; High-Tc superconductors; Anelasticity; Stress effects
• ISSN: 1293-2558; 1873-3085
• DOI: 10.1016/j.solidstatesciences.2011.10.021

Double perovskite YBaCuFeO5+ delta samples were prepared by two different sintering procedures. The interstitial oxygen contents of two samples are different which were estimated from thermogravimetric analysis (TGA). The mechanical spectrum below room temperature was measured using the vibrating reed method at kilohertz frequencies. Two internal friction peaks can be discerned in two samples above 200K whose intensities show a correlation with the interstitial oxygen concentration. The lower temperature peak is attributed to the freezing transition of the interstitial oxygen. Another internal friction peak observed around 150K can be explained by the stress induced hopping of electrons in the Fe ion sites.